Automatic level control for radio frequency amplifiers

Details Automatic level control for radio frequency amplifiers Automatic level control for radio frequency amplifiers

2007-09-18

2007-09-18

Chang, Joseph (Department: 2817)

Oscillators

Amplitude control or stabilization

Automatic

C331S074000

Reexamination Certificate

active

10918744

ABSTRACT:
The disclosure relates to an automatic level control technique for RF amplifiers in a communication system, such as a wireless communication system. The invention provides an automatic level control technique to compensate for variations in the gain of an RF amplifier, which may be a transmitter amplifier or a receiver amplifier. In accordance with the invention, the gain of the RF amplifier can be controlled as a function of the output of a voltage controlled oscillator (VCO) circuit provided in the communication system. A VCO typically includes a buffer amplifier with a structure similar to that of the RF amplifier used in the transmit or receive side of the RF front-end. By tracking changes in the output of the VCO buffer amplifier, an automatic level control (ALC) input to the RF amplifier can be adjusted to compensate for process- and temperature-based variations in amplifier gain.

REFERENCES:
patent: 5196808 (1993-03-01), Pickett et al.
patent: 6052036 (2000-04-01), Enstrom et al.
patent: 6396354 (2002-05-01), Murayama et al.
patent: 6680655 (2004-01-01), Rogers
patent: 6741137 (2004-05-01), Sibrai et al.
patent: 6744320 (2004-06-01), Nguyen et al.
patent: 6825722 (2004-11-01), Segawa

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