Hybrid analog digital automatic gain control gain recovery syste

Details Hybrid analog digital automatic gain control gain recovery syste Hybrid analog digital automatic gain control gain recovery syste

1994-07-19

1995-06-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330134, H03G 330

Patent

active

054226015

ABSTRACT:
A hybrid analog/digital automatic gain control gain recovery system includes a variable gain amplifier (VGA) for receiving a variable amplitude input signal; a first AGC loop includes an analog to digital converter (DAC) for receiving the analog input signal and converting it to a digital signal; a digital gain error detection circuit for detecting variations of the digital signal in a first range and generating a digital error correction signal; and a digital to analog converter (DAC) for converting the digital error correction signal to a first analog correction signal; a second analog AGC loop includes an analog gain error detection circuit, responsive to variations in the output of the VGA in a second range greater than the first range for generating a second analog correction signal; and an integrator circuit responsive to the first and second analog correction signals for providing to the VGA a control signal to adjust the gain of the VGA to accommodate variations in the input signal amplitude.

REFERENCES:
patent: 4750058 (1988-06-01), Hirt et al.
patent: 5220466 (1993-06-01), Coker et al.
patent: 5267272 (1993-11-01), Cai et al.
Philpott et al, "A 7 Mbyte/s (65 MHz), Mixed-Signal, Magnetic Recording Channel DSP Using Partial Response Signaling with Maximum Likelihood Detection", IEEE Journal of Solid-State Circuits, vol. 29, No. 3, Mar. 1994, pp. 177-184.

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