Amplifying circuit for use with a high impedance source transduc

Details Amplifying circuit for use with a high impedance source transduc Amplifying circuit for use with a high impedance source transduc

1974-10-10

1976-11-23

Claffy, Kathleen H.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 13, H04R 300

Patent

active

039938697

ABSTRACT:
An amplifying circuit for use with a transducer includes a pair of field-effect transistors which are of different conductive types from each other and each of which has gate, drain and source electrodes. The gate electrodes of the field-effect transistors are connected to each other and are further connected to an output terminal of an electrostatic type mechanical-electrical transducer, while the source electrodes of the field-effect transistors are connected to each other and are further connected to an output circuit. One of the drain electrodes is connected to a voltage source and the other drain electrode is connected to the circuit ground. High input impedance is maintained by using no gate resistor at the input, and using a current-sourced source-follower secondstage. Source resistors improve linear performance.

REFERENCES:
patent: 3300585 (1967-01-01), Reedyk et al.
patent: 3378783 (1968-04-01), Gibson
Gosling, "Field Effect Transistors", Wiley 1965.
N. S. (National Semiconductor), "N.S. Application Note AN 48-1", 1971.
Freiman, "Eliminate Dead Zone . . . ", Electronic Design, Sept. 26, 1968, p. 70.
Sevin, "FET," McGraw Hill, 1965, pp. 64-69.

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