Amplifier with variable signal gain and matched gain bandwidth

Details Amplifier with variable signal gain and matched gain bandwidth Amplifier with variable signal gain and matched gain bandwidth

2006-02-28

2006-02-28

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208100, C330S308000, C348S300000

Reexamination Certificate

active

07005628

ABSTRACT:
A sensor includes a gain stage with a differential amplifier with an adjustable gain. The differential amplifier may change its gain in response to the magnitude of a signal readout from the pixel array. The differential amplifier includes an input transistor with an adjustable transconductance. A transconductance controller can change the bias currents supplied to one or more sets of parallel transistors in the input transistor and consequently change the transconductance, and power consumption, of the input transistor. The transconductance controller can select a transconductance setting that is associated with a selected gain setting in order to more efficiently match the power consumption of the amplifier to its gain.

REFERENCES:
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patent: 6661457 (2003-12-01), Mathur et al.
patent: 6707492 (2004-03-01), Itani

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