JPS6442905A - High frequency gain variable amplifier - Google Patents
High frequency gain variable amplifierInfo
- Publication number
- JPS6442905A JPS6442905A JP20017387A JP20017387A JPS6442905A JP S6442905 A JPS6442905 A JP S6442905A JP 20017387 A JP20017387 A JP 20017387A JP 20017387 A JP20017387 A JP 20017387A JP S6442905 A JPS6442905 A JP S6442905A
- Authority
- JP
- Japan
- Prior art keywords
- gain
- high frequency
- circuit
- amplifier
- potential
- 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
- Amplifiers (AREA)
Abstract
PURPOSE:To decrease the deterioration in the gain attenuation at a high frequency by providing a differential transistor(TR) amplifier circuit, a control circuit varying the gain of the said amplifier circuit and a passive element circuit with a high frequency low impedance connected to one of output terminals of the differential TR amplifier circuit. CONSTITUTION:An input signal is supplied from an input terminal 8, amplified by a common emitter TR 1 and a common base TR 2 and the result is outputted to an output terminal 9. In this case, the gain control terminal 10 is set to a potential where the base potential oaf the TR 2 is higher than the base potential of the TR 3 to turn off the TR 3 completely thereby maximizing the gain of the amplifier. Then the potential of the gain control terminal 10 is lowered to turn off the TR 2 completely thereby minimizing the gain of the amplifier. The collector of the TR 3 in the amplifier circuit has a low impedance at a high frequency due to the series resonance of the passive component circuit 5 comprising the series resonance circuit. Thus, the deterioration in the gain attenuation at a high frequency is reduced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20017387A JPS6442905A (en) | 1987-08-10 | 1987-08-10 | High frequency gain variable amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20017387A JPS6442905A (en) | 1987-08-10 | 1987-08-10 | High frequency gain variable amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6442905A true JPS6442905A (en) | 1989-02-15 |
Family
ID=16420007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20017387A Pending JPS6442905A (en) | 1987-08-10 | 1987-08-10 | High frequency gain variable amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6442905A (en) |
-
1987
- 1987-08-10 JP JP20017387A patent/JPS6442905A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1325284A (en) | Amplifier circuit | |
CA2021380A1 (en) | Equalizing and amplifying circuit in an optical signal receiving apparatus | |
JPS6442905A (en) | High frequency gain variable amplifier | |
WO1995006977A1 (en) | Active impedance termination | |
JPS5728407A (en) | Amplifying circuit | |
EP0181752A3 (en) | Extended range amplifier circuit | |
JPS6451704A (en) | Feedback amplifier circuit | |
JPS5546672A (en) | Transistor amplifier circuit | |
ATE97769T1 (en) | FULL BAND AMPLIFIER WITH CONSTANT GAIN AND HIGH FREQUENCY DETERMINED INPUT IMPEDANCE. | |
JPS57147309A (en) | Variable gain amplifier | |
TW361009B (en) | Variable gain amplifier circuit | |
JPS5715578A (en) | Carrier wave pickup circut | |
SU1584076A1 (en) | Voltage repeater | |
JPS5574224A (en) | Signal amplifying circuit | |
EP0180337A3 (en) | Buffer circuit | |
JPS57196609A (en) | Gain adjusting circuit | |
EP0388529A3 (en) | Logic circuits using a status holding circuit | |
JPS6416006A (en) | Dc amplifier circuit | |
JPS57181215A (en) | Variable gain circuit | |
JPS5634210A (en) | Agc circuit | |
JPS6412706A (en) | Operational amplifier circuit | |
JPS57166709A (en) | Amplifier | |
JPS5733812A (en) | Transistor amplifier | |
JPS6489607A (en) | High frequency amplifier circuit | |
JPS5466749A (en) | Antenna input circuit of high frequency amplification circuit |