CN202503511U - Signal detector and detection circuit thereof - Google Patents
Signal detector and detection circuit thereof Download PDFInfo
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- CN202503511U CN202503511U CN2012200859401U CN201220085940U CN202503511U CN 202503511 U CN202503511 U CN 202503511U CN 2012200859401 U CN2012200859401 U CN 2012200859401U CN 201220085940 U CN201220085940 U CN 201220085940U CN 202503511 U CN202503511 U CN 202503511U
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Abstract
The utility model discloses a signal detector and a detection circuit thereof, wherein the detection circuit comprises an input buffer, a coupling capacitor, a DC bias circuit, a Gilbert cell, an integrator, a comparator and a threshold value setting circuit. The signal detection circuit has the advantages of small time constant and fast responding speed, and is applicable to various application environments including optical fiber receivers of a continuous-mode or a burst mode. In a burst mode, the limiting amplifier signal detection circuit disclosed by the utility model can not only be used in a GPON-OLT system provided with reset signals, but also be applicable to an EPON-OLT system without the reset signals.
Description
Technical field
The utility model relates to the optical communication equipment field, in particular a kind of signal sensor and detection circuit thereof.
Background technology
In optical communication equipment, whether recipient is received the device that signal detects be called signal sensor.The signalling channel of photelectric receiver generally is made up of preposition trans-impedance amplifier and amplitude limit post amplifier two parts, and signal sensor generally is the part of amplitude limit post amplifier.Traditional signal sensor generally is to realize through direct-current coupling; As shown in Figure 1; Signal is through input buffer; The first curtage amount that the average energy (rms) or the average voltage level (flip-flop) of signal are changed into representation signal intensity compares through comparator 3 and predetermined amount (threshold value), thereby judges whether receiver receives signal.
Since the input signal of receiver generally too a little less than, be difficult for being arrived by direct detection, generally all be just can survey after amplifying through signal amplifier 2.But the signal after amplifying can be introduced DC deviation because of the parameter mismatch of amplifier, and therefore the sensitivity meeting of traditional direct-current coupling signal sensor receives the influence of pre-amplifier direct current mismatch and reduce; In addition, because need measure the input signal value of averaging, promptly integration is with average, and the reaction time of classical signals detector is longer, can not be used for the detection of burst.
Therefore, prior art awaits to improve and development.
The utility model content
The purpose of the utility model is to provide a kind of signal sensor and detection circuit thereof; Be intended to solve the classical signals detector sensitivity and can receive the influence of pre-amplifier direct current mismatch and reduce with the reaction time of classical signals detector longlyer, can not be used for the problem of the detection of burst.
The technical scheme of the utility model is following:
A kind of signal detection circuit; Wherein, comprise input buffer, coupling capacitor, dc bias circuit, Gilbert cell, integrator, comparator and threshold value setting circuit: the output of said input buffer is connected with the input of said coupling capacitor; The output of said coupling capacitor is connected with the input of said Gilbert cell; The output of said Gilbert cell is connected with the input of said comparator; Said dc bias circuit is connected with the output of said coupling capacitor; Said integrator is connected with the output of said Gilbert cell; The output of said comparator is connected with said threshold value setting circuit; Said threshold value setting circuit is connected with the output of said Gilbert cell.
Described signal detection circuit, wherein, said integrator comprises integrating condenser and resistance.
Described signal detection circuit; Wherein, Said threshold setting circuit comprises the first interlock adjustable current source, second interlock adjustable current source, first difference channel and second difference channel; Said first difference channel is connected with the first interlock adjustable current source, and said second difference channel is connected with the second interlock adjustable current source.
Described signal detection circuit, wherein, the output of said comparator is connected with the input of the said first interlock adjustable current source or the second interlock adjustable current source.
Described signal detection circuit, wherein, said signal detection circuit also comprises rest-set flip-flop, and the S end of said rest-set flip-flop is connected with the output of said comparator, and the R end of said rest-set flip-flop connects a reset signal.
Described signal detection circuit; Wherein, Said signal detection circuit also comprises the one-level amplifier, and said one-level amplifier input terminal is connected with the output of said coupling capacitor, and the output of said one-level amplifier is connected with the input of said Gilbert cell.
Described signal detection circuit, wherein, said one-level amplifier is a differential amplifier.
A kind of signal sensor wherein, comprises above-mentioned described any signal detection circuit.
The beneficial effect of the utility model: the utility model is through providing a kind of signal sensor and detection circuit thereof; This signal detection circuit has the fast advantageous characteristic of the little reaction speed of time constant, is applicable to multiple applied environment: the fiber optic receiver that comprises continuous mode and burst mode; In burst mode, this limiting amplifier signal detection circuit both can be applicable to the GPON-OLT system of reset signal, and being applicable to does not have the EPON-OLT of reset signal system yet.
Description of drawings
Fig. 1 is traditional signal detection circuit sketch map.
Fig. 2 is the utility model signal detection circuit sketch map.
Fig. 3 is the threshold value setting circuit diagram of the utility model signal detection circuit.
Fig. 4 is the oscillogram of input signal through this signal detection circuit.
Fig. 5 is that this signal detection circuit is applied to first kind of circuit diagram under the GPON-OLT pattern.
Fig. 6 is the oscillogram that this signal detection circuit is applied to input signal under the GPON-OLT pattern.
Fig. 7 is that this signal detection circuit is applied to second kind of circuit diagram under the GPON-OLT pattern.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, clear and definite, below develop simultaneously embodiment to the utility model further explain with reference to accompanying drawing.
As shown in Figure 2, be this signal detection circuit sketch map.This signal detection circuit comprises input buffer 1, coupling capacitor 8, dc bias circuit 5, Gilbert cell 4, integrator 6, comparator 3 and threshold value setting circuit 7: the output of said input buffer 1 is connected with the input of said coupling capacitor 8; The output 8 of said coupling capacitor is connected with the input of said Gilbert cell 4; Said dc bias circuit 5 is connected with the output of said coupling capacitor 8; The output of said Gilbert cell 4 is connected with the input of said comparator 3; Said integrator 6 is connected with the output of said Gilbert cell 4; The output of said comparator 3 is connected with said threshold value setting circuit 7; Said threshold value setting circuit 7 is connected with the output of said Gilbert cell 4.
The effect of said input buffer 1 is that input signal is temporarily deposited; The effect of said dc bias circuit 5 is that the direct current in the erasure signal is bigoted; The effect of said coupling capacitor 8 is the amplification that input signal is necessarily gained and the filtering of AC coupled, removes flip-flop, keeps AC signal; The effect of said Gilbert cell 4 is that signal is carried out multiplying, AC signal is played the effect of rectification; The effect of said integrator 6 is that signal is carried out subtraction; The effect of said threshold value setting circuit 7 is to set the difference threshold value; The effect of said comparator 3 is with signal and difference threshold ratio, output correspondent voltage value.
In the present embodiment, said integrator 6 comprises integrating condenser and resistance.
As shown in Figure 3, be the threshold value setting circuit diagram of the utility model signal detection circuit.Said threshold setting circuit comprises the first interlock adjustable current source Y1 and the second interlock adjustable current source Y2; Said threshold setting circuit comprises first difference channel and second difference channel, and said first difference channel is connected with the first interlock adjustable current source Y1; Said second difference channel is connected with the second interlock adjustable current source Y2.
The output of said comparator 3 is connected with the input of interlock adjustable current source Y1 or Y2, and the input that constitutes comparator 3 is sluggish.Sluggish effect is the vibration that reduces comparator 3.
The input service scope that comparator 3 generally need be able to be regulated, promptly turn threshold need be adjustable with sluggishness, so that detector can effectively be surveyed the signal of different amplitudes.The threshold value of comparator 3 has positive and negative two threshold values: positive threshold is comparator 3 output by low input signal amplitude when the high tumble; The negative sense threshold value is that comparator 3 outputs are by the input signal amplitude of height when hanging down upset.General two threshold values are different, and the difference of positive threshold and negative sense threshold value is exactly the sluggishness of comparator 3.Turn threshold in the present embodiment is provided with through first difference channel and the first interlock adjustable current source Y1, second difference channel and the second interlock adjustable current source Y2 circuit with sluggish.
The detection process to signal of this signal sensor circuit is specific as follows: the input signal of limiting amplifier generally is the high-frequency pulse string (shown in Fig. 4 .a) of certain amplitude; Earlier after the amplification and filtering through coupling capacitor 8 certain gains; Remove the flip-flop of signal; Having only AC signal to get into next stage is Gilbert cell 4, and Gilbert cell (Gillbert Cell) carries out multiplying to signal, to AC signal rectification (shown in Fig. 4 .b); Signal after the rectification is equivalent to pass through LPF one time through integrator 6, and the differential voltage that is produced no longer is a high-frequency signal pulse train itself, but has represented the low frequency waveform (shown in Fig. 4 .c) of original signal amplitude size; The difference threshold value that resulting low frequency difference signal and threshold value setting circuit 7 are set is carried out subtraction through integrator 6; The result who obtains constitutes the input signal of comparator 3: if differential signal is greater than the difference threshold value; Then comparator 3 output valves are supply voltage value, show that limiting amplifier has received enough strong signal; Otherwise, if differential signal less than the difference threshold value, then comparator 3 output valves are zero, show that limiting amplifier does not receive enough strong signal (shown in Fig. 4 .d).
As shown in Figure 5, be that this signal detection circuit is applied to first kind of circuit diagram under the GPON-OLT pattern.Change in some burst mode greatly in impulse density, in using like GPON, this signal detection circuit can be set up rest-set flip-flop 9, can improve the stability of the final output of this detection circuit; The S end of said rest-set flip-flop 9 is connected with the output of said comparator 3; Connecting a reset signal (Reset) at the R of said rest-set flip-flop 9 end, so that be rest-set flip-flop setting initial condition value, and is the signal sensor zero clearing.
The operation principle that this signal detection circuit is applied under the GPON-OLT pattern is: when enough strong input signal was detected, rest-set flip-flop just was locked as high input state, even longer a period of time of blackout also still is in high output state; Have only when the reset signal pulse occurs, the output of the height of signal detection circuit just can promptly be reverted to and wait for or survey dress attitude (as shown in Figure 6) by zero clearing.
As shown in Figure 7; In order to improve the sensitivity of this detection circuit; Make it can detect littler input signal; Can also set up one-level amplifier 10: the input of said one-level amplifier 10 is connected with the output of said coupling capacitor 8, and the output of said one-level amplifier 10 is connected with the input of said Gilbert cell 4.Said one-level amplifier 10 is differential amplifiers of the low mismatch in a broadband.
The enforcement of this detection circuit can be used discrete component, also can use IC regime.When implementing, both can use FET (CMOS) technology also can use bipolar process with integrated circuit technology.
Gilbert cell 4 has thermally sensitive shortcoming.Utilize the threshold setting circuit 7 in this circuit; Can the temperature characterisitic of Gilbert cell 4 be compensated, thereby can improve and optimize the temperature stability of detector: as long as the first interlock adjustable current source Y1 and second of the threshold setting section in this circuit adjustable current source Y2 that links is arranged to can realize with the current source of temperature correlation the effect of the valve value compensation of comparator 3.
The utility model also provides a kind of signal sensor that comprises above-mentioned described signal detection circuit; Has the fast advantageous characteristic of the little reaction speed of time constant based on this signal detection circuit; This signal sensor is applicable to multiple applied environment: comprise the fiber optic receiver of continuous mode and burst mode, or the like.
Should be understood that; The application of the utility model is not limited to above-mentioned giving an example; Concerning those of ordinary skills, can improve or conversion according to above-mentioned explanation, all these improvement and conversion all should belong to the protection range of the utility model accompanying claims.
Claims (8)
1. signal detection circuit; It is characterized in that, comprise input buffer, coupling capacitor, dc bias circuit, Gilbert cell, integrator, comparator and threshold value setting circuit: the output of said input buffer is connected with the input of said coupling capacitor; The output of said coupling capacitor is connected with the input of said Gilbert cell; The output of said Gilbert cell is connected with the input of said comparator; Said dc bias circuit is connected with the output of said coupling capacitor; Said integrator is connected with the output of said Gilbert cell; The output of said comparator is connected with said threshold value setting circuit; Said threshold value setting circuit is connected with the output of said Gilbert cell.
2. signal detection circuit according to claim 1 is characterized in that said integrator comprises integrating condenser and resistance.
3. signal detection circuit according to claim 1; It is characterized in that; Said threshold setting circuit comprises the first interlock adjustable current source, second interlock adjustable current source, first difference channel and second difference channel; Said first difference channel is connected with the first interlock adjustable current source, and said second difference channel is connected with the second interlock adjustable current source.
4. signal detection circuit according to claim 3 is characterized in that, the output of said comparator is connected with the input of the said first interlock adjustable current source or the second interlock adjustable current source.
5. signal detection circuit according to claim 1 is characterized in that said signal detection circuit also comprises rest-set flip-flop, and the S end of said rest-set flip-flop is connected with the output of said comparator, and the R end of said rest-set flip-flop connects a reset signal.
6. signal detection circuit according to claim 1; It is characterized in that; Said signal detection circuit also comprises the one-level amplifier; Said one-level amplifier input terminal is connected with the output of said coupling capacitor, and the output of said one-level amplifier is connected with the input of said Gilbert cell.
7. signal detection circuit according to claim 6 is characterized in that, said one-level amplifier is a differential amplifier.
8. a signal sensor is characterized in that, comprises the described any signal detection circuit of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200859401U CN202503511U (en) | 2012-03-08 | 2012-03-08 | Signal detector and detection circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200859401U CN202503511U (en) | 2012-03-08 | 2012-03-08 | Signal detector and detection circuit thereof |
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| CN202503511U true CN202503511U (en) | 2012-10-24 |
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| CN2012200859401U Expired - Fee Related CN202503511U (en) | 2012-03-08 | 2012-03-08 | Signal detector and detection circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624449A (en) * | 2012-03-08 | 2012-08-01 | 佛山敏石芯片有限公司 | Signal detector and detection circuit thereof |
-
2012
- 2012-03-08 CN CN2012200859401U patent/CN202503511U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624449A (en) * | 2012-03-08 | 2012-08-01 | 佛山敏石芯片有限公司 | Signal detector and detection circuit thereof |
| CN102624449B (en) * | 2012-03-08 | 2015-09-23 | 佛山敏石芯片有限公司 | A kind of signal sensor and detection circuit thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121024 Termination date: 20160308 |