Stabilized DC amplifier

Amplifiers – With periodic switching input-output

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Details

330 69, H03F 102, H03F 126

Patent

active

042988438

ABSTRACT:
A pressure responsive system includes a piezoresistive transducer (10) mounted in a housing (20) with the temperature of the housing and the transducer maintained by heater (22). Operating characteristics of the transducer (10) are normalized by a normalization circuit (18) that interconnects the output of the transducer to a heater control (24). The heater control (24) generates a control signal to the heater (22). A signal varying with pressure is output from the normalization circuit (18) and applied to a DC stabilized gain stage (26) that is corrected for zero signal error and produces an amplification of the transducer output for application to a function generator (12). The function generator (12) converts an absolute pressure signal from the transducer (10) into a signal varying with pressure altitude for utilization in an autopilot system.

REFERENCES:
patent: 3518563 (1970-06-01), Ainsworth
patent: 3694760 (1972-09-01), Loessi
patent: 3988689 (1976-10-01), Ochi et al.

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