CMOS differential voltage controlled logarithmic attenuator and

Details CMOS differential voltage controlled logarithmic attenuator and CMOS differential voltage controlled logarithmic attenuator and

1997-10-02

1999-03-09

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327350, H03G 1108

Patent

active

058806180

ABSTRACT:
A logarithmic attenuator circuit includes a resistive attenuator in which the series resistors are P-channel MOSFETs with gate electrodes connected to V.sub.DD and the parallel resistors are P-channel MOSFETs which also function as switches. A control circuit (8B) produces a plurality of successive control signals (V1,2 . . . 10) on the gate electrodes of the successive MOSFETs which functions as switches in response to a gain control signal (V.sub.GC)

REFERENCES:
patent: 3539831 (1970-11-01), Gilbert
patent: 3590366 (1971-06-01), Vaughn
patent: 4475169 (1984-10-01), Gilbert
patent: 4476538 (1984-10-01), Gilbert
patent: 4500845 (1985-02-01), Ehni
patent: 4521764 (1985-06-01), Burton
patent: 5077541 (1991-12-01), Gilbert
patent: 5432478 (1995-07-01), Gilbert
patent: 5523712 (1996-06-01), Miyabe et al.

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