High frequency signal amplifying circuit and a receiver using the same
US6281757A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 2000 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | May 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G1/0023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier for amplifying a high frequency signal includes comprises cascade-connected an input npn transistor and an output npn transistor and a bias circuit to control a base current Ib of the input transistor in order to make a DC component of a collector current Ic of the cascade-connected npn transistors constant. A shunt transistor is further connected between a base electrode of the input npn transistor and one terminal of a power source and is connected so that the base current of the input npn transistor flows through a resistor connected between a base electrode and an emitter electrode of the shunt transistor. By lowering a base voltage of the output npn transistor in response to a gain control signal, the collector current Ic is reduced, and a gain of the amplifier is reduced, and simultaneously the shunt transistor is made in shunting operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.