Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1997-07-28
1998-12-01
Young, Brian
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341155, H03M 118
Patent
active
058445129
ABSTRACT:
An autoranging apparatus and method for an analog-to-digital converter (ADC) which uses a proposed gain detector including a peak of absolute detector and a quantizer to determine a proposed gain, and a amplifier gain setting rule processor in parallel with an anti-aliasing (AA) filter. The rule processor generates a current gain from inputs including the current gain, proposed gain, and a resolution bandwidth (RBW) value. The current gain is used to set a variable amplifier before the signal is sampled & held, and then converted to a digital word via the ADC. A variable bandpass filter can additionally be used before the AA filter to produce a pre-filtered signal. The pre-filtered signal would similarly be processed by the proposed gain detector. The resulting digital word is scaled down again through values stored in a look-up table. The look-up table is generated via a calibration routine which determines with certain precision the variable gain levels for the particular amplifier device used.
REFERENCES:
patent: 5329281 (1994-07-01), Baumgartner et al.
Gorin Joseph M.
Sheppard Roger D.
Hewlett--Packard Company
Wheeler Jeffrey D.
Young Brian
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