Signal coupling systems with enhanced isolation and dynamic...

Details Signal coupling systems with enhanced isolation and dynamic... Signal coupling systems with enhanced isolation and dynamic...

2005-03-01

2005-03-01

Nguyen, Khanh V. (Department: 2817)

Amplifiers

Variable impedance for signal channel controlled by separate...

C030S286000, C030S295000

Reexamination Certificate

active

06861903

ABSTRACT:
Signal coupling systems are provided which enhance signal isolation and dynamic range with structures that increase bias voltages in upstream signal amplifiers to guard against transistor saturation that would otherwise increase current drain, reduce response time and possibly cause lock-up of an associated gain-control system. Dynamic range is thus enhanced because these systems can operate over an extended range of source signals. The increased bias voltages also decrease parasitic junction capacitances which increases input impedances and thereby enhances signal isolation and reduces signal distortion.

REFERENCES:
patent: 4521764 (1985-06-01), Burton
patent: 5021743 (1991-06-01), Chu et al.
patent: 5077541 (1991-12-01), Gilbert
patent: 5532637 (1996-07-01), Khoury et al.
patent: 5859559 (1999-01-01), Hong et al.
patent: 6727762 (2004-04-01), Kobayashi

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