Amplifier system with special feedback circuits

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

H - Electricity

03

F

330/103, 340/159

H03F 17/00 (2006.01) H03F 1/34 (2006.01) H03F 3/08 (2006.01)

Patent

CA 1092202

ABSTRACT OF THE DISCLOSURE 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 condition. 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.

293838

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