Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1998-08-06
2000-08-22
Mottola, Steven J.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330133, H03G 320
Patent
active
061078786
ABSTRACT:
The present invention is a novel and improved AGC circuit which is generically configurable to accommodate a variety of AGC amplifier configurations to enhance IP3 performance and reduce required amplifier current, while providing a received power estimate which remains valid regardless of how the gain or attenuation is distributed among the various amplifiers. A generic control circuit maintains this power estimate in a single overall gain amplification value by distributing gain to at least two amplifier stages in response to that value. By programming or hard coding a few key parameters, a generic control circuit can control a wide variety of amplifier configurations. Among the configurations supported are switched LNA, switched variable gain LNA, variable gain, and a decoupled IF and UHF variable gain LNA configuration. The invention is extendable to include multi-stage amplifier configurations. Although the preferred embodiment includes two stages, one for UHF and one for IF, three or more stages can easily be adapted. Various filtering schemes can be applied to the power estimate to tailor the temporal dynamics of gain switching. For example, a low pass filter can be applied to the UHF front end to give it a slower response than the IF stage. All of these configurations and any subset can be supported in a single generic device.
REFERENCES:
patent: 4747143 (1988-05-01), Kroeger et al.
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5056109 (1991-10-01), Gilhousen et al.
patent: 5099204 (1992-03-01), Wheatley, III
patent: 5603113 (1997-02-01), De Loe
patent: 5627857 (1997-05-01), Wilson
patent: 5745847 (1998-04-01), Matsuo
Clark Kevin J.
Mottola Steven J.
Qualcomm Incorporated
Rouse Thomas R.
Wadsworth Philip
LandOfFree
Automatic gain control circuit for controlling multiple variable does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic gain control circuit for controlling multiple variable, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic gain control circuit for controlling multiple variable will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-585362