Control circuitry for an RF signal amplifier

Details Control circuitry for an RF signal amplifier Control circuitry for an RF signal amplifier

1992-07-22

1994-03-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

328 26, 330140, H03G 330

Patent

active

052911500

ABSTRACT:
Control circuitry for maintaining the magnitude of an RF signal from an RF signal amplifier at a predetermined level includes a detector which is supplied with a signal indicative of the power level of the output from the amplifier and outputs a signal which is dependant upon the input signal. A detector (100) is provided with a negative feedback loop (200) which supplies a biasing voltage Vb to the input of the detector, whereby the biasing voltage Vb decreases if the magnitude of the signal (P) input and hence the output signal (Vr), increases, thus serving to decrease the output voltage (Vr), and vice versa. This has the advantage of increasing the dynamic range of the detector.

REFERENCES:
patent: 4158180 (1979-06-01), Challen
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4937842 (1990-06-01), Howell

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