Amplifier system with special feedback circuits

Details Amplifier system with special feedback circuits Amplifier system with special feedback circuits

1977-02-09

1978-03-14

Mullins, James B.

Amplifiers

With amplifier condition indicating or testing means

219499, 328 3, 330 59, 330104, 330108, 330110, H03F 1700, H03F 136

Patent

active

040793311

ABSTRACT:
A condition responsive element, disclosed as a negative temperature coefficient thermistor, operates in conjunction with a bridge circuit to provide a differential input to a special direct current amplifier system. The amplifier system utilizes a combination of positive feedback and negative feedback with the negative feedback always exceeding the level of the positive feedback under steady state operating conditions. The output of the amplifier means further is connected to the lowest energizing potential for the amplifier means through a network that includes a relatively fixed voltage dropping means so that changes in the negative feedback can be made to change the gain of the amplifier system with a minimum of offset or change in calibration of the condition responsive device.

REFERENCES:
patent: 3535561 (1970-10-01), Pinckaers
patent: 3604957 (1971-09-01), Satula
patent: 3639824 (1972-02-01), Malavasi
patent: 3705316 (1972-12-01), Burrows et al.
patent: 3777187 (1973-12-01), Kohn
patent: 3816760 (1974-06-01), Slawson et al.
patent: 3819960 (1974-06-01), Kohn et al.
patent: 3917993 (1975-11-01), Picmaus et al.
patent: 3939433 (1976-02-01), Okada et al.
Cook et al., "Feedback T Yields High Input Impedances", Electronics, 4/17/67, p. 91.

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