Variable gain circuit and radio apparatus using the same

Details Variable gain circuit and radio apparatus using the same Variable gain circuit and radio apparatus using the same

1995-09-08

1998-09-15

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552411, 4552452, 330129, H03G 300, H03F 368

Patent

active

058094083

ABSTRACT:
A gain switching circuit comprises first and second gain stages connected in parallel between the input terminal and the output terminal, and a control unit for allowing the first and second gain stages to be selectively operative, wherein the first and second gain stages respectively include input sections in which input impedance values viewed from the input terminal are substantially equal to each other, and output sections in which output impedance values viewed from the output terminal are substantially equal to each other. By this configuration, a gain switching circuit and a radio apparatus using such a gain switching circuit adapted so that input/output impedance does not fluctuate are provided without implementing switching between gain stages.

REFERENCES:
patent: 3654566 (1972-04-01), Wellhausen et al.
patent: 4598252 (1986-07-01), Andricos
patent: 4794343 (1988-12-01), Yang
patent: 4851796 (1989-07-01), Hendriks
patent: 4855614 (1989-08-01), Maitre
patent: 5233634 (1993-08-01), Vaisanen
Tanaka et al., "Low Noise, Low-Distortion Front-End IC for 1-1-V Paging Receiver", IEEE Transactions On Consumer electronics, vol. 37, No. 3, pp. 578-584, (1990).
Patent Abstract of Japan No. JP-A-01 204477 (NEC Corp), Aug. 1989, vol. 013, No. 507 (E-845), Nov. 1989.

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