Preamplifier system

Details Preamplifier system Preamplifier system

1998-04-03

1999-11-02

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330310, H03F 304

Patent

active

059778342

ABSTRACT:
A preamplifier system (10) is provided which amplifies and conditions an input electromagnetic signal for insertion into a high power amplifier. The preamplifier system (10) includes a plurality of cascaded amplifying stages (100a-100d) for incrementally amplifying the input electromagnetic signal, as well as bias control circuitry coupled to the amplifying stages (100a-100d) to electrically bias at least one of those stages into a Class A operational mode and an adjustable phase shift unit (300) coupled to at least one of the amplifying stages (100a-100d) for reversibly shifting the phase of the input electromagnetic signal in accordance with the given high power amplifier's configuration. Each amplifying stage (100a-100d) includes at least one transistor assembly device (110a-110d) having integrally formed therein a plurality of silicon carbide cells coupled one to the other. The amplifying stages (100a-100d) collectively operate in stable, substantially linear manner to effect a predetermined level of gain in high power applications.

REFERENCES:
patent: 4075576 (1978-02-01), Eden
patent: 4268797 (1981-05-01), Buck et al.
patent: 4591802 (1986-05-01), Asazawa
patent: 5010588 (1991-04-01), Gimlett
patent: 5532650 (1996-07-01), Igarashi
patent: 5812221 (1998-09-01), Davis et al.

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