Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1998-06-11
2000-06-27
Tokar, Michael
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341 61, H03M 300
Patent
active
060812168
ABSTRACT:
An oversampled analog-to-digital converter (ADC) (20) includes a sigma-delta modulator (21) with two decimation filters to provide minimum power consumption. The first decimation filter (30) converts the output of the sigma-delta modulator (21) to a slower intermediate frequency and performs a first part of the decimation function. The second decimation filter (40) converts the output of the first decimation filter (30) to the output frequency and performs a second part of the decimation function. The ADC (20) saves power by allowing some of the second part of the decimation function to be performed at the slower intermediate frequency. In one form, the first decimation filter (30) includes a finite impulse response (FIR) filter (32) and a down sampler (34). By using a suitable logic circuit (56), the FIR filter (32) can be implemented with only a small amount of circuit area and most of the FIR filter (32) can be operated at the slower intermediate frequency.
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Clingan Jr. James L.
Jean-Pierre Peguy
Motorola Inc.
Polansky Paul J.
Tokar Michael
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