Adaptive bandwidth amplifier

Details Adaptive bandwidth amplifier Adaptive bandwidth amplifier

1984-05-30

1986-05-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330278, 330109, H03F 134, H03G 320

Patent

active

045918058

ABSTRACT:
An amplifier exploits Miller-effect capacitance in a cascaded multi-stage self-limiting amplifier arrangement to achieve automatic adaptive bandwidth behavior (without the use of an active feedback control loop). The Miller-effect capacitance varies in accordance with the amplifier signal-level, with the capacitance in turn varying the amplifier bandwidth. Bandwidth is decreased for low-signal-levels and increased for relatively high-signal-levels. The adaptive amplifier technique is especially useful to reduce broadband noise in an IF stage of a communications device before the usable signal is fed to a detector stage.

REFERENCES:
patent: 2969459 (1961-01-01), Hern
patent: 3217257 (1965-11-01), Boatwright
patent: 3786363 (1974-01-01), Lelie
patent: 3909725 (1975-09-01), Baghdady
patent: 4502017 (1985-02-01), Van de Plassche

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