Automatic gain control

Details Automatic gain control Automatic gain control

H - Electricity

03

K

329/5

H03K 9/00 (2006.01) H03G 3/20 (2006.01) H04L 7/04 (2006.01)

Patent

CA 2030355

ABSTRACT OF THE DISCLOSURE An automatic gain control (AGC) for a demodulator which received digitally modulated burst signals time- serially from a plurality of terminals. The AGC has a series connection of a variable attenuator and a limiter that precedes a demodulator. The variable attenuator is controlled such that when a burst signal is absent, the noise power level inputted to the limiter coincides with a predetermined reference value, whereby when burst signal is present, the limiter controls the burst signal to a predetermined level. As a result, when burst signals greatly differ in level from one another, they are controlled to the predetermined level in their preamble word portions. This insures stable demodulation of data signals.

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