Calibration technique for variable-gain amplifiers

Details Calibration technique for variable-gain amplifiers Calibration technique for variable-gain amplifiers

2006-12-12

2006-12-12

Pascal, Robert (Department: 2817)

Amplifiers

With periodic switching input-output

C327S307000

Reexamination Certificate

active

07148744

ABSTRACT:
A variable-gain amplifier (VGA), with one or more amplifier stages, has two or more offset correction sources connected to apply offset correction signals at different locations in the VGA. In one embodiment, each amplifier stage has both an input offset correction source and an output offset correction source. In another embodiment, each amplifier stage of a multi-stage VGA has an input offset correction source. By sequentially calibrating each amplifier stage, starting with the initial stage and proceeding downstream, the entire VGA can be calibrated to achieve gain-independent compensation for the adverse affects of input and output voltage offsets at the input and output, respectively, of each stage.

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SA 21.3: “A High-Performance Autozeroed CMOS Opamp with ToμV Offset”, Francois Krummenacher et al., 1997 IEEE International Solid-State Circuits Conference, pp. 350-351.
Applicant's admitted prior-art technique for reducing offset in high-frequency amplifiers.

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