Automatic level control for radio frequency amplifiers

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

2007-08-22

2009-12-01

Chang, Joseph (Department: 2817)

Oscillators

Combined with particular output coupling network

C330S254000, C331S183000

Reexamination Certificate

active

07626467

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.

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