Method and apparatus for increasing the linearity of the phase a

Details Method and apparatus for increasing the linearity of the phase a Method and apparatus for increasing the linearity of the phase a

1998-08-06

2000-08-22

Pascal, Robert

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330129, H03G 320

Patent

active

061078808

ABSTRACT:
The present invention provides for a method and apparatus for increasing the linearity of the phase and gain of an amplifier circuit (10, 22). The amplifier circuit (10, 22) maintains linearity of the amplified output signal by monitoring the power levels of the input signal, and adjusting the supply voltage level(s) of the amplifier (18), based upon the measured input power levels. By appropriately adjusting the supply voltage level(s) of the amplifier (18) an output signal having a consistent gain and phase can be realized. Preferably a delay circuit (26) will be used to delay receipt of the input signal by the amplifier (18), so as to synchronize receipt of the input signal with the corresponding source voltage adjustments. The value of the delay preferably corresponds to the time for the envelope detector (14) to measure the instantaneous input power levels and the time for the processing unit (16) to determine and apply the appropriate supply voltage level(s) to the amplifier (18).

REFERENCES:
patent: 4873493 (1989-10-01), Fujiwara
patent: 5142240 (1992-08-01), Isota et al.
patent: 5311143 (1994-05-01), Soliday
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5831475 (1998-11-01), Myers et al.
patent: 5861777 (1999-01-01), Sigmon et al.

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