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JPS57103409A - Local oscillating circuit - Google Patents

Local oscillating circuit

Info

Publication number
JPS57103409A
JPS57103409A JP55179020A JP17902080A JPS57103409A JP S57103409 A JPS57103409 A JP S57103409A JP 55179020 A JP55179020 A JP 55179020A JP 17902080 A JP17902080 A JP 17902080A JP S57103409 A JPS57103409 A JP S57103409A
Authority
JP
Japan
Prior art keywords
switching
capacity
switch
output terminal
amplifying element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP55179020A
Other languages
Japanese (ja)
Inventor
Masaji Isogawa
Yoshiharu Umemura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55179020A priority Critical patent/JPS57103409A/en
Publication of JPS57103409A publication Critical patent/JPS57103409A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/1262—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising switched elements
    • H03B5/1265—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising switched elements switched capacitors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

PURPOSE:To reduce the number of parts and to obtain a good oscillation, by using a switching circuit for switching capacities as well as a switch for switching bands. CONSTITUTION:When a high band is received, a switch 5 for switching bands is turned on, and the connection point between tuning coils 3 and 4 is grounded, and therefore, capacitors 10 and 9 act as an output terminal capacity of an amplifying element 1. When a low band is received, the capacitor 10 acts for feedback because the switch 5 is turned off. Then, the value of the capacitor 10 is set to a proper value to obtain proper output terminal capacity and feedback capacity of the amplifying element 1 in each receiving band. Since the output terminal capacity and the feedback capacity of the amplifying element 1 are switched to optimum values for each receiving band without using a private switching circuit, a good local oscillating circuit with a small number of parts is obtained.
JP55179020A 1980-12-19 1980-12-19 Local oscillating circuit Pending JPS57103409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55179020A JPS57103409A (en) 1980-12-19 1980-12-19 Local oscillating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55179020A JPS57103409A (en) 1980-12-19 1980-12-19 Local oscillating circuit

Publications (1)

Publication Number Publication Date
JPS57103409A true JPS57103409A (en) 1982-06-28

Family

ID=16058700

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55179020A Pending JPS57103409A (en) 1980-12-19 1980-12-19 Local oscillating circuit

Country Status (1)

Country Link
JP (1) JPS57103409A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5548677A (en) * 1993-03-31 1996-08-20 Sumitomo Electric Industries, Ltd. Housing structure for coupling and releasing optical modules

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5548677A (en) * 1993-03-31 1996-08-20 Sumitomo Electric Industries, Ltd. Housing structure for coupling and releasing optical modules
US5719978A (en) * 1993-03-31 1998-02-17 Sumitomo Electric Industries, Ltd. Parallel transmission module for transmitting a plurality of optical signals in parallel and method for manufacturing the same
US5764833A (en) * 1993-03-31 1998-06-09 Sumitomo Electric Industries, Ltd. Optical fiber array

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