Circuit layout to eliminate alternating voltage interference sig

Details Circuit layout to eliminate alternating voltage interference sig Circuit layout to eliminate alternating voltage interference sig

1988-10-13

1989-06-13

Mottola, Steven

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, 330258, H03F 126

Patent

active

048396087

ABSTRACT:
AC interference signals are eliminating during amplification of certain DC signals of interest in a low-pass amplifier by providing an auxiliary AC amplifier in like configuration as the low-pass amplifier, amplifying the interference signals in the auxiliary amplifier, and applying the resulting compensation signal to a summing node of the low-pass amplifier in counterphase to the original interference signals. Such an approach avoids much of the complexity and cost of prior art compensating networks.

REFERENCES:
patent: 3550013 (1970-12-01), Gurol
patent: 4129853 (1978-12-01), Althauser et al.
patent: 4293819 (1981-10-01), Shibayama et al.
patent: 4484146 (1984-11-01), Naito
Article: Elektronik 1962, #5 (pp. 131-133) "Transistoren und ihre Anwendungen in der Industrie".

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