CN103986427A - Instrumentation amplifier circuit with selectable magnification times - Google Patents
Instrumentation amplifier circuit with selectable magnification times Download PDFInfo
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- CN103986427A CN103986427A CN201410219095.6A CN201410219095A CN103986427A CN 103986427 A CN103986427 A CN 103986427A CN 201410219095 A CN201410219095 A CN 201410219095A CN 103986427 A CN103986427 A CN 103986427A
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- precision resistance
- instrument amplifier
- multiplication factor
- spst
- throw switch
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Abstract
The invention discloses an instrumentation amplifier circuit with selectable magnification times. The circuit is composed of an instrumentation amplifier AD620, an integrated circuit CD4051, a single-pole single-throw switch and a plurality of resistors, wherein a signal is input by the pin 2 and the pin 3 of the AD620, amplified by the AD620 and then output by the pin 6, the magnification times is decided by the values of the resistors bridged between the pin 1 and the pin 8 of the AD620, the different resistors are connected between the pin 1 and the pin 8 under the control of different switches, and the AD620 outputs signals with different voltage values for different magnification times. According to the circuit disclosed by the invention, proper magnification times is realized by gating a resistor channel corresponding to the needed magnification times, thus solving the problem of different magnification times needed by the different signals.
Description
Technical field
The instrument amplifier circuit that the present invention relates to a kind of optional multiplication factor, belongs to circuit design field.
Background technology
At present, the direct modeling amount of remote sensing camera Management Controller has plurality of level value, as 3V, and 5V etc., camera ground detection platform, when remote sensing camera Management Controller is tested, gathers direct modeling amount.Owing to there being the existence of plurality of level value, if carry out image data by single multiplication factor, can cause the acquisition precision of other level value to receive impact; If want the acquisition precision that keeps higher, just need to different multiplication factors be set to different test channel, to improve acquisition precision.For different test channel, design at present the output circuit of single multiplication factor, when test channel is more, amplifier circuit volume is excessive, complexity is higher.And causing the serious waste of resource, versatility is poorer, so need now the amplifier circuit that a kind of versatility is stronger, adopts different multiplication factors in the time of can testing unlike signal path, guarantees the precision of data acquisition.
Summary of the invention
Technology of the present invention is dealt with problems and is: for the deficiencies in the prior art, a kind of a kind of new magnifier of instrument amplifier circuit design of optional multiplication factor has been proposed, by resistive path corresponding to the required multiplication factor of gating, realize suitable multiplication factor, solve the required different problem of multiplication factor of collection unlike signal, thereby guaranteed the precision of data acquisition.
Technical solution of the present invention is:
A kind of instrument amplifier circuit of optional multiplication factor comprises: instrument amplifier U1, integrated circuit U2, precision resistance R1, precision resistance R2, precision resistance R3, precision resistance R4, precision resistance R5, precision resistance R6, precision resistance R7, precision resistance R8, pull-up resistor R9, pull-up resistor R10, pull-up resistor R11, pull-up resistor R12, single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8; Wherein instrument amplifier U1 adopts AD620 to realize, and integrated circuit U2 adopts CD4051 to realize, and CD4051 has 7 outputs, is respectively I/O0, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6, I/O7;
The output I/O0 of integrated circuit U2, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6, I/O7 is respectively successively by precision resistance R1 and single-pole single-throw switch (SPST) K1, precision resistance R2 and single-pole single-throw switch (SPST) K2, precision resistance R3 and single-pole single-throw switch (SPST) K3, precision resistance R4 and single-pole single-throw switch (SPST) K4, precision resistance R5 and single-pole single-throw switch (SPST) K5, precision resistance R6 and single-pole single-throw switch (SPST) K6, precision resistance R7 and single-pole single-throw switch (SPST) K7, precision resistance R8 and single-pole single-throw switch (SPST) K8 are connected to the multiplication factor resistance access pin one of instrument amplifier U1, signalling channel gating A, B, the C of integrated circuit U2 are connected to external direct current power supply by pull-up resistor R10, pull-up resistor R11, pull-up resistor R12 respectively, the INH of integrated circuit U2 (Enable Pin) is connected to DC power supply by pull-up resistor R9, the I/O end of integrated circuit U2 connects the multiplication factor resistance access pin 8 of instrument amplifier U1,
The electrode input end of instrument amplifier U1 is connected respectively external input signal with negative input, the output of instrument amplifier U1 is by the signal output after amplifying, be connected respectively with the 7+12V of power pin 4 of instrument amplifier U1 ,-12V direct current of voltage regulation, ground pin 5 connecting analog ground.
Different single-pole single-throw switch (SPST) K1, the K2 of described selection, K3, K4, K5, K6, K7, K8 switch are closed separately, the signal of instrument amplifier U1 output different amplification, single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8 switch be closure simultaneously.
Described precision resistance R1 is 98.8K ohm, and corresponding instrument amplifier U1 multiplication factor is 1.5 times; Precision resistance R2 is 49.4K ohm, and corresponding instrument amplifier U1 multiplication factor is 2 times; Precision resistance R3 is 32.93K ohm, and corresponding instrument amplifier U1 multiplication factor is 2.5 times; Precision resistance R4 is 24.7K ohm, and corresponding instrument amplifier U1 multiplication factor is 3 times; Precision resistance R5 is 19.76K ohm, and corresponding instrument amplifier U1 multiplication factor is 3.5 times; Precision resistance R6 is 16.47K ohm, and corresponding instrument amplifier U1 multiplication factor is 4 times; Precision resistance R7 is 14.11K ohm, and corresponding instrument amplifier U1 multiplication factor is 4.5 times; Precision resistance R8 is 12.35K ohm, and corresponding instrument amplifier U1 multiplication factor is 5 times.
Described pull-up resistor R10, R11, R12, resistance is 5.1K ohm.
The present invention's advantage is compared with prior art:
(1) the present invention is when the direct modeling amount to remote sensing camera Management Controller takes remote measurement, can adopt different multiplication factors to the signalling channel of varying level value, guarantee the pinpoint accuracy gathering, promoted the index of camera ground detection platform direct modeling amount remote measurement.
(2) the present invention is in the system of a plurality of test channel, and circuit volume is little, simple in structure, and complexity is lower, provides cost savings, and has improved efficiency, and versatility is stronger.
Accompanying drawing explanation
Fig. 1 is the instrument amplifier circuit structure diagram of the optional multiplication factor of the present invention.
Embodiment
Below just by reference to the accompanying drawings the present invention is described further.
As shown in Figure 1, a kind of instrument amplifier circuit of optional multiplication factor comprises: instrument amplifier U1, integrated circuit U2, precision resistance R1, precision resistance R2, precision resistance R3, precision resistance R4, precision resistance R5, precision resistance R6, precision resistance R7, precision resistance R8, pull-up resistor R9, pull-up resistor R10, pull-up resistor R11, pull-up resistor R12, single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8; Wherein instrument amplifier U1 adopts AD620 to realize, and integrated circuit U2 adopts CD4051 to realize, and CD4051 has 7 outputs, is respectively I/O0, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6, I/O7;
The output I/O0 of integrated circuit U2, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6, I/O7 is respectively successively by precision resistance R1 and single-pole single-throw switch (SPST) K1, precision resistance R2 and single-pole single-throw switch (SPST) K2, precision resistance R3 and single-pole single-throw switch (SPST) K3, precision resistance R4 and single-pole single-throw switch (SPST) K4, precision resistance R5 and single-pole single-throw switch (SPST) K5, precision resistance R6 and single-pole single-throw switch (SPST) K6, precision resistance R7 and single-pole single-throw switch (SPST) K7, precision resistance R8 and single-pole single-throw switch (SPST) K8 are connected to the multiplication factor resistance access pin one of instrument amplifier U1, the eight passage gating pin A of integrated circuit U2, B, C are connected to external direct current power supply by pull-up resistor R10, pull-up resistor R11, pull-up resistor R12 respectively, the INH of integrated circuit U2 (Enable Pin) is connected to DC power supply by pull-up resistor R9, the I/O end of integrated circuit U2 connects the multiplication factor resistance access pin 8 of instrument amplifier U1,
The electrode input end of instrument amplifier U1 is connected respectively external input signal with negative input, the output of instrument amplifier U1 is by the signal output after amplifying, be connected respectively with the 7+12V of power pin 4 of instrument amplifier U1 ,-12V direct current of voltage regulation, ground pin 5 connecting analog ground.
Select different single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8 switch closed separately, the signal of instrument amplifier U1 output different amplification, single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8 switch be closure simultaneously.
Different resistances are connected to amplifier, make amplifier have different multiplication factors, and wherein precision resistance R1 is 98.8K ohm, and corresponding instrument amplifier U1 multiplication factor is 1.5 times; Precision resistance R2 is 49.4K ohm, and corresponding instrument amplifier U1 multiplication factor is 2 times; Precision resistance R3 is 32.93K ohm, and corresponding instrument amplifier U1 multiplication factor is 2.5 times; Precision resistance R4 is 24.7K ohm, and corresponding instrument amplifier U1 multiplication factor is 3 times; Precision resistance R5 is 19.76K ohm, and corresponding instrument amplifier U1 multiplication factor is 3.5 times; Precision resistance R6 is 16.47K ohm, and corresponding instrument amplifier U1 multiplication factor is 4 times; Precision resistance R7 is 14.11K ohm, and corresponding instrument amplifier U1 multiplication factor is 4.5 times; Precision resistance R8 is 12.35K ohm, and corresponding instrument amplifier U1 multiplication factor is 5 times.
While gathering telemetry, according to the level value of unlike signal passage, in conjunction with the multiplication factor of different passages.Utilize signalling channel strobe pin (i.e. the 9th pin of channel selecting integrated circuit CD4051, the 10th pin and the 11st pin) carry out the passage that gating is corresponding, as shown in table 1, thus the precision resistance of corresponding resistance is connected between the 1st pin and the 8th pin of instrument amplifier AD620.Thereby corresponding signal is selectively amplified, reach certain required precision.Pull-up resistor R10, R11, R12, resistance is 5.1K ohm.
The table 1CD4051 channel selecting table of comparisons
| INH | C | B | A | Gating channel number |
| 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 1 | 1 |
| 0 | 0 | 1 | 0 | 2 |
| 0 | 0 | 1 | 1 | 3 |
| 0 | 1 | 0 | 0 | 4 |
| 0 | 1 | 0 | 1 | 5 |
| 0 | 1 | 1 | 0 | 6 |
| 0 | 1 | 1 | 1 | 7 |
| 1 | X | X | X | None |
[0024]the unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (4)
1. an instrument amplifier circuit for optional multiplication factor, is characterized in that comprising: instrument amplifier U1, integrated circuit U2, precision resistance R1, precision resistance R2, precision resistance R3, precision resistance R4, precision resistance R5, precision resistance R6, precision resistance R7, precision resistance R8, pull-up resistor R9, pull-up resistor R10, pull-up resistor R11, pull-up resistor R12, single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8; Wherein instrument amplifier U1 adopts AD620, and integrated circuit U2 adopts CD4051, and CD4051 has 7 outputs, is respectively I/O0, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6, I/O7;
The output I/O0 of integrated circuit U2, I/O1, I/O2, I/O3, I/O4, I/O5, I/O6, I/O7 is respectively successively by precision resistance R1 and single-pole single-throw switch (SPST) K1, precision resistance R2 and single-pole single-throw switch (SPST) K2, precision resistance R3 and single-pole single-throw switch (SPST) K3, precision resistance R4 and single-pole single-throw switch (SPST) K4, precision resistance R5 and single-pole single-throw switch (SPST) K5, precision resistance R6 and single-pole single-throw switch (SPST) K6, precision resistance R7 and single-pole single-throw switch (SPST) K7, precision resistance R8 and single-pole single-throw switch (SPST) K8 are connected to the multiplication factor resistance access pin one of instrument amplifier U1, the signalling channel gating pin A of integrated circuit U2, B, C are connected to external direct current power supply by pull-up resistor R10, pull-up resistor R11, pull-up resistor R12 respectively, the Enable Pin INH of integrated circuit U2 is connected to DC power supply by pull-up resistor R9, the I/O end of integrated circuit U2 connects the multiplication factor resistance access pin 8 of instrument amplifier U1,
The electrode input end of instrument amplifier U1 is connected respectively external input signal with negative input, the output of instrument amplifier U1 is by the signal output after amplifying, be connected respectively with the 7+12V of power pin 4 of instrument amplifier U1 ,-12V direct current of voltage regulation, ground pin 5 connecting analog ground.
2. the instrument amplifier circuit of a kind of optional multiplication factor according to claim 1, it is characterized in that: different single-pole single-throw switch (SPST) K1, the K2 of described selection, K3, K4, K5, K6, K7, K8 switch are closed separately, the signal of instrument amplifier U1 output different amplification, single-pole single-throw switch (SPST) K1, K2, K3, K4, K5, K6, K7, K8 switch be closure simultaneously.
3. the instrument amplifier circuit of a kind of optional multiplication factor according to claim 2, is characterized in that: described precision resistance R1 is 98.8K ohm, and corresponding instrument amplifier U1 multiplication factor is 1.5 times; Precision resistance R2 is 49.4K ohm, and corresponding instrument amplifier U1 multiplication factor is 2 times; Precision resistance R3 is 32.93K ohm, and corresponding instrument amplifier U1 multiplication factor is 2.5 times; Precision resistance R4 is 24.7K ohm, and corresponding instrument amplifier U1 multiplication factor is 3 times; Precision resistance R5 is 19.76K ohm, and corresponding instrument amplifier U1 multiplication factor is 3.5 times; Precision resistance R6 is 16.47K ohm, and corresponding instrument amplifier U1 multiplication factor is 4 times; Precision resistance R7 is 14.11K ohm, and corresponding instrument amplifier U1 multiplication factor is 4.5 times; Precision resistance R8 is 12.35K ohm, and corresponding instrument amplifier U1 multiplication factor is 5 times.
4. the instrument amplifier circuit of a kind of optional multiplication factor according to claim 1, is characterized in that: described pull-up resistor R10, R11, R12, resistance is 5.1K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219095.6A CN103986427A (en) | 2014-05-22 | 2014-05-22 | Instrumentation amplifier circuit with selectable magnification times |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410219095.6A CN103986427A (en) | 2014-05-22 | 2014-05-22 | Instrumentation amplifier circuit with selectable magnification times |
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| CN103986427A true CN103986427A (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410219095.6A Pending CN103986427A (en) | 2014-05-22 | 2014-05-22 | Instrumentation amplifier circuit with selectable magnification times |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509626A (en) * | 2015-11-25 | 2016-04-20 | 上海工程技术大学 | Instrument amplification circuit for micro displacement testing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010114500A (en) * | 2008-11-04 | 2010-05-20 | Seiko Epson Corp | Power amplifying device |
| CN202772846U (en) * | 2012-09-29 | 2013-03-06 | 深圳市矽普特科技有限公司 | Audio amplifier circuit with stable gain |
| CN203606655U (en) * | 2013-11-29 | 2014-05-21 | 衢州铭泰仪器设计有限公司 | Amplification circuit capable of selecting amplification factors automatically |
-
2014
- 2014-05-22 CN CN201410219095.6A patent/CN103986427A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010114500A (en) * | 2008-11-04 | 2010-05-20 | Seiko Epson Corp | Power amplifying device |
| CN202772846U (en) * | 2012-09-29 | 2013-03-06 | 深圳市矽普特科技有限公司 | Audio amplifier circuit with stable gain |
| CN203606655U (en) * | 2013-11-29 | 2014-05-21 | 衢州铭泰仪器设计有限公司 | Amplification circuit capable of selecting amplification factors automatically |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509626A (en) * | 2015-11-25 | 2016-04-20 | 上海工程技术大学 | Instrument amplification circuit for micro displacement testing |
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Application publication date: 20140813 |
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