Pulse or digital communications – Receivers – Automatic gain control
Reexamination Certificate
2005-11-15
2005-11-15
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Receivers
Automatic gain control
C455S232100
Reexamination Certificate
active
06965656
ABSTRACT:
A demodulator controls gains of an RF-AGC amplifier and an IF-AGC amplifier so as to maintain an input level to the demodulator constant. In this case, the demodulator estimates a signal level of an RF input based on the sum of the gains directed to the both AGC amplifiers, and changes methods for distributing a gain to the AGC amplifiers, according to whether or not the signal level exceeds a predetermined Take Over Point. Further, a first detection and smoothing circuit detects an output level of the RF-AGC amplifier, and a second detection and smoothing circuit detects an output of a mixer. Besides, a comparison circuit controls the gain of the RF-AGC amplifier so that a difference between the output levels comes to be a predetermined value. With this structure, an automatic gain control circuit which can achieve high receiving sensitivity and low waveform distortion simultaneously can be realized even when manufacturing dispersion is caused.
REFERENCES:
patent: 5483691 (1996-01-01), Heck et al.
patent: 5659582 (1997-08-01), Kojima et al.
patent: 6-276116 (1994-09-01), None
Bocure Tesfaldet
Sharp Kabushiki Kaisha
LandOfFree
Automatic gain control method and automatic gain control... 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 method and automatic gain control..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic gain control method and automatic gain control... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3458898