Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1995-12-29
1998-03-03
Mottola, Steven
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330140, 330279, H03G 330
Patent
active
057240035
ABSTRACT:
A method for obtaining a rectified signal from a first alternating current signal. The method includes the step of inputting the first alternating current signal into a variable gain amplifier to obtain a second alternating current signal. The second alternating current signal has a substantially constant peak-to-peak voltage irrespective of a power level of the first alternating current signal. The method further includes the step of rectifying the second alternating current signal, using a power detector circuit, to obtain the rectified signal, whereby a direct current level of the rectified signal is substantially proportional to the power level of the first alternating current irrespective of the power level of the first alternating current. The rectified signal may then be employed in, for example, a feedback control circuit to control the amount of power output by an RF signal source.
REFERENCES:
patent: 3918003 (1975-11-01), Seidel
patent: 5208550 (1993-05-01), Iwane
patent: 5214393 (1993-05-01), Aihara
patent: 5376895 (1994-12-01), Aihara
Jensen Brent R.
Marsh James W. H.
Maxim Integrated Products Inc.
Mottola Steven
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