Amplifiers – With semiconductor amplifying device – Including protection means
Patent
1998-04-07
2000-10-24
Shingleton, Michael B
Amplifiers
With semiconductor amplifying device
Including protection means
330207P, 455115, H02H 720, H03F 304
Patent
active
061373664
ABSTRACT:
The present invention teaches a variety of high VSWR mismatch output stages and methods for protecting output stages during high VSWR operation. To accomplish these goals, the present invention teaches absorbing reverse base current arising at the base of the power transistor of the output stage. In one embodiment, a variable impedance device such as a transistor is coupled to the base of the power transistor such that when the base-emitter voltage exceeds a predefined voltage, the variable impedance device goes into a low impedance mode and absorbs a portion of the base current. In another embodiment, feedback control circuitry is incorporated into the output stage bias circuitry in order to control the total base current.
REFERENCES:
patent: 3845405 (1974-10-01), Leidich
patent: 4729129 (1988-03-01), Koerner
patent: 4859967 (1989-08-01), Swanson
patent: 5081425 (1992-01-01), Jackson et al.
patent: 5357089 (1994-10-01), Prentice
patent: 5423081 (1995-06-01), Thiele et al.
patent: 5493255 (1996-02-01), Murtojarvi
Wong et al., "TP 3.5: A 2.7-5.5V 0.2-1W BiCMOS RF Driver Amplifier IC with Closed-loop Power Control and Biasing," Philips Semiconductors, Sunnyvale, 1998 IEEE International Solid-State Circuits Conference, pp. 52-53.
Maxim Integrated Products, "Low Voltage, Silicon RF Power Amplifier/Predriver," 19-1093: Rev 0; Jul. 1996, pp. 1-8, Sunnyvale, CA, http://www.maxim-ic.com.
Maxim Integrated Products, "MAX2430 Evaluation Kit," pp. 1-4, Sunnyvale, CA, http://www.maxim-ic.com. Dated at Least One Year Prior to Instant Invention.
Maxim Integrated Products Inc.
Shingleton Michael B
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