JPS648706A - Modulator-demodulator circuit - Google Patents
Modulator-demodulator circuitInfo
- 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
Links
Landscapes
- 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.
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)
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 |
-
1987
- 1987-06-30 JP JP16423487A patent/JPS648706A/en active Pending
Cited By (2)
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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