Gain control circuit and optical recording and reproducing...

Details Gain control circuit and optical recording and reproducing... Gain control circuit and optical recording and reproducing...

2011-01-04

2011-01-04

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C330S278000

Reexamination Certificate

active

07864652

ABSTRACT:
A gain control circuit to determine gain by a current ratio of mutual conductance. The gain control circuit includes a first gain control circuit in which positive and negative phase input signals are supplied, gain is changed based on a first control signal, and positive and negative phase output signals are outputted, a second gain control circuit in which the positive and negative phase input signals are supplied, gain is changed based on a second control signal, and the positive and negative phase output signals are outputted, and a load circuit in which the positive phase output signal of the first gain control circuit and the negative phase output signal of the second gain control circuit are synthesized and supplied to a first input terminal, and the negative phase output signal of the first gain control circuit and the positive phase output signal of the second gain control circuit are synthesized and supplied to a second input terminal, and the synthesized signals are lead out through mutual conductance.

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patent: 2000049550 (2000-02-01), None
patent: 2005-045716 (2005-02-01), None

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