Drive circuit with limited signal transition rate for RFI reduct

Details Drive circuit with limited signal transition rate for RFI reduct Drive circuit with limited signal transition rate for RFI reduct

1986-10-30

1988-04-19

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307475, 307363, 307263, H03K 1716

Patent

active

047391936

ABSTRACT:
An amplifier applies turn-on bias to the gate electrode of an output field-effect transistor in response to a first level of an input signal applied to the amplifier. A switched power source supplies operating current to the amplifier for developing the turn-on bias when the amplifier input signal is at the first level. A feedback-controlled bypass circuit diverts a portion of the operating current from the amplifier during an initial turn-on period and gradually reduces the magnitude of the diverted operating current as the output transistor turns on thereby producing a "soft" turn-on of the output transistor so as to minimize a potential for creating radio frequency interference in nearby RFI sensitive devices such as the tuner in a television or radio receiver. Complementary circuits include dual current supply and diversion circuits providing controlled rise and fall times for complementary field-effect output transistors.

REFERENCES:
patent: 3984703 (1976-10-01), Jorgensen
patent: 4216393 (1980-08-01), Gillberg et al.
patent: 4461963 (1984-07-01), Koomen
patent: 4464587 (1984-08-01), Suzuki et al.
patent: 4507576 (1985-03-01), McCracken et al.
patent: 4539489 (1985-09-01), Vaughn
patent: 4563594 (1986-01-01), Koyama
patent: 4567378 (1986-01-01), Raver
patent: 4622482 (1986-11-01), Ganger

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