Inhalation transducer circuit with DC drift compensation

Details Inhalation transducer circuit with DC drift compensation Inhalation transducer circuit with DC drift compensation

1982-09-07

1986-07-22

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328162, G06G 710, H03B 100

Patent

active

046021710

ABSTRACT:
An inhalation transducer circuit is provided for use with a transducer having a variable electrical output. Early amplifier stages provide very high gain, and are subsequently a.c. coupled to stages of lesser gain leading to a microprocessor and an output. An electronic switch is connected to the a.c. coupling circuit, and when no breathing is being measured and there is no output to the amplification circuit this switch is periodically closed to connect a reference voltage to the a.c. coupling, and thus to compensate for any DC drift in the transducer and early amplification stages.

REFERENCES:
patent: 3176236 (1965-03-01), Abbott et al.
patent: 3419809 (1968-12-01), Lach et al.
patent: 3579124 (1971-05-01), O'Hara
patent: 3737798 (1973-06-01), Faraguet et al.

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