Digital automatic gain control circuit

Details Digital automatic gain control circuit Digital automatic gain control circuit

H - Electricity

03

G

330/39, 354/70

H03G 3/20 (2006.01) H03G 3/30 (2006.01)

Patent

CA 1198823

- 14 - A DIGITAL AUTOMATIC GAIN CONTROL CIRCUIT ABSTRACT OF THE DISCLOSURE A digital automatic gain control circuit provided with both a first AGC loop and a second AGC loop activated alternatively. The first AGC loop is activated when an input signal is initially supplied. The loop produces a certain digital value, calculated as an inverse number of the digital level of the input through predetermined digital arithmetic operations utilizing an approximation polynominal. The calculated digital value is then preset in certain portions of the second AGC loop. The second AGC loop starts operating by using said preset value, then uses the digital level of the input itself, instead of the preset value, and produces automatic gain controlled digital output.

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