Signal processing device

Details Signal processing device Signal processing device

1993-04-20

1995-04-11

Kuntz, Curtis

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

381104, H03G 700

Patent

active

054066360

ABSTRACT:
An audio electronic volume controller (100; consisting of a ladder resistance and a CMOS switch group) and an output buffer (B2) are formed within an identical semiconductor substrate 10S, and nodes (N.sub.31 and N.sub.31) are directly connected by a wiring layer (31). An input differential circuit element of an operational amplifying element which is a main unit of the output buffer (B2) is configured using MOSFETs. Accordingly, input bias current and floating impedance can be decreased which leads to a decrease in the generation of click noise.

REFERENCES:
patent: 4126830 (1978-11-01), Schade, Jr.
patent: 4991221 (1991-02-01), Rush
patent: 5201009 (1993-04-01), Yamada et al.
patent: 5237195 (1993-08-01), Sadamatsu

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