Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1987-01-29
1988-06-28
Miller, Stanley D.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
328165, 330 86, 330254, 330282, 330302, 330303, 307543, 307546, 307550, 307562, H03B 2800, H03K 500
Patent
active
047542241
ABSTRACT:
A circuit arrangement for converting an input voltage into a proportional ouput signal, including a converting resistance which is followed by operational amplifier having a feedback resistance. For the purpose of stabilizing the gain of the circuit arrangement with respect to changes in the converting resistance, the latter is formed by connecting two branch resistances in parallel with each other. These branch resistances are series-connected in a bridge circuit to which a direct voltage is supplied from a voltage source. The bridge circuit also includes an operational amplifier and high-quality film resistors and a variable balancing resistance which includes, in series, another film resistor and a field effect transistor. An integrator automatically balances the bridge circuit by controlling the field effect transistor. The balancing resistor. The feedback resistance operational of the amplifier contains, in series, a film resistor which corresponds to the film resistor in the balancing resistance and a field effect transistor which is matched to the field effect transistor (13) in the balancing resistance. The field effect transistors are controlled in parallel by the integrator. The circuit arrangement can be used for processing the output signal of a capacitive voltage transducer.
REFERENCES:
patent: 3863173 (1975-01-01), Scheib et al.
patent: 4383229 (1983-05-01), Jones
patent: 4547742 (1985-10-01), Maschek et al.
patent: 4584558 (1986-04-01), Maschek et al.
Electronic Design, Band 26, Nr. 15, Jul. 19, 1978, Seiten 68-73, Rochelle Park, (US).
Maschek Martin
Mastner Georg
BBC Brown Boveri & Company Limited
Miller Stanley D.
Roseen Richard
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