Control circuit with automatic DC offset

Details Control circuit with automatic DC offset Control circuit with automatic DC offset

2008-05-27

2008-05-27

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular component circuitry

Having feedback circuitry

C372S038100, C372S038020, C372S038070

Reissue Patent

active

RE040343

ABSTRACT:
An automatic gain control circuit in the feedback path for a laser wavelength control circuit is described herein. This gain control circuit automatically adjusts the amplification of the analog signals output from a photodetector array, where the array detects a fringe pattern created by a laser beam. Another feature of the preferred embodiment feedback circuit is the automatic setting of a DC offset voltage that compensates for errors in the feedback path and enables an accurate determination of a dark level signal in the fringe pattern signal. This dark level signal provides a reference for measuring the magnitude of the fringe pattern signal. Varying photodetector outputs may now be more accurately measured. The preferred embodiment feedback circuit also employs a very fast amplifier anti-saturation circuit using LED's connected in a clamp circuit.

REFERENCES:
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patent: 5025445 (1991-06-01), Anderson et al.
patent: 5095492 (1992-03-01), Sandstrom
patent: 5382786 (1995-01-01), Lovelace
patent: 5420877 (1995-05-01), Sandstrom
patent: 5450207 (1995-09-01), Fomenkov
patent: 5612529 (1997-03-01), Coleman
patent: 5663671 (1997-09-01), Steglich
patent: 5867514 (1999-02-01), Anderson
patent: 6282218 (2001-08-01), Anderson

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