JPS648706A - Modulator-demodulator circuit - Google Patents

Modulator-demodulator circuit

Info

Publication number
JPS648706A
JPS648706A JP16423487A JP16423487A JPS648706A JP S648706 A JPS648706 A JP S648706A JP 16423487 A JP16423487 A JP 16423487A JP 16423487 A JP16423487 A JP 16423487A JP S648706 A JPS648706 A JP S648706A
Authority
JP
Japan
Prior art keywords
trs
current
modulator
collector
demodulator circuit
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
JP16423487A
Other languages
Japanese (ja)
Inventor
Makoto Mashita
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP16423487A priority Critical patent/JPS648706A/en
Publication of JPS648706A publication Critical patent/JPS648706A/en
Pending legal-status Critical Current

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  • Amplitude Modulation (AREA)

Abstract

PURPOSE:To improve the circuit characteristic by providing a DC feedback with simple constitution to a modulator-demodulator circuit so as to reduce remarkably carrier leakage due to a defective component with no adjustment. CONSTITUTION:The modulator-demodulator circuit is provided with a 1st differential amplifier having 1st and 2nd constant current sources and comprising transistors(TRs) Q1, Q2 amplifying an input signal, and 1st and 2nd current mirrors comprising TRs Q5-Q7 receiving a collector current of the said amplifier. Moreover, the 2nd and 3rd differential amplifiers using an output of the current mirror and comprising TRs Q9-Q12 amplifying the carrier are provided. Furthermore, the 3rd current mirror employing TRs Q13, Q14 using bases and emitters of the 1st and 2nd current mirrors in common is provided and its collector is connected to the 4th current mirror comprising TRs Q15, Q16. A capacitor C1 is connected between the collector and the emitter of the TR Q14 and a signal of the electrode of the capacitor C1 not at the grounding side is fed back to the input of the 1st differential amplifier.
JP16423487A 1987-06-30 1987-06-30 Modulator-demodulator circuit Pending JPS648706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16423487A JPS648706A (en) 1987-06-30 1987-06-30 Modulator-demodulator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16423487A JPS648706A (en) 1987-06-30 1987-06-30 Modulator-demodulator circuit

Publications (1)

Publication Number Publication Date
JPS648706A true JPS648706A (en) 1989-01-12

Family

ID=15789219

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16423487A Pending JPS648706A (en) 1987-06-30 1987-06-30 Modulator-demodulator circuit

Country Status (1)

Country Link
JP (1) JPS648706A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04240904A (en) * 1991-01-24 1992-08-28 Nec Corp Frequency multiple mixer circuit
US5306128A (en) * 1992-03-02 1994-04-26 Samsung Electronics Co., Ltd. Discharge valve device of a rotary compressor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04240904A (en) * 1991-01-24 1992-08-28 Nec Corp Frequency multiple mixer circuit
US5306128A (en) * 1992-03-02 1994-04-26 Samsung Electronics Co., Ltd. Discharge valve device of a rotary compressor

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