Microphone amplifier, in particular for telephone systems

Details Microphone amplifier, in particular for telephone systems Microphone amplifier, in particular for telephone systems

1979-11-01

1981-10-13

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330260, 330311, H03F 345, H03F 368

Patent

active

042951003

ABSTRACT:
In a microphone amplifier a differential amplifier input stage is coupled to a Darlington amplifier output stage by way of a symmetrically connected coupling stage and a two-stage intermediate amplifier. A negative feedback circuit is connected between the output and input stages and current mirror circuits are connected to the coupling stage and to the input stage for providing current symmetry.

REFERENCES:
patent: 3581084 (1971-05-01), Kaneno et al.
patent: 3668320 (1972-06-01), Duck
patent: 4135162 (1979-01-01), Takahashi
patent: 4140878 (1979-02-01), Ohsawa
Hartmuth, Duck, Jenik Aufbau und Anwendung integrierter Halbleiterschaltungen vol. 1, 1969 p. 13.
Kessel, Plassche Integiierbare Grundschaltungen fur analoge Signale Philips Technische Rundschau 1971/1972 Num. 1 pp.4-8.
Siemens Datenbuch 1974/1975 Band 2 Lineare Schaltungen pp. 213-215.

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