Adjustment of amplitude and DC offsets in a digital receiver

Details Adjustment of amplitude and DC offsets in a digital receiver Adjustment of amplitude and DC offsets in a digital receiver

2005-04-19

2005-04-19

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C330S009000

Reexamination Certificate

active

06882208

ABSTRACT:
A nonlinear adaptive mechanism for amplitude adjustment and DC estimation and compensation for use in a digital receiver such as a Bluetooth GFSK receiver. The mechanism uses a feed-forward technique that can be used in a multi-stage scheme to perform both DC compensation and amplitude adjustment of an input signal for use by subsequent processing stages. In a first stage, coarse DC offset compensation is performed and the offset estimates generated are subsequently frozen. In a second stage, the incoming signal with the DC offset subtracted from it, is then scaled into a narrow predefined range of amplitudes using a scaling mechanism that works with gains and attenuations that are powers of two in order to simplify implementation. In a third stage, the scaled compensated signal is then injected again into the same DC estimation mechanism, which was previously used for DC compensation in the first stage, for further DC offset estimation and compensation (i.e. fine DC estimation and compensation).

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patent: 4641324 (1987-02-01), Karsh et al.
patent: 5025456 (1991-06-01), Ota et al.
patent: 6043766 (2000-03-01), Hee et al.

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