Selectable intermediate frequency sigma-delta analog-to-digital

Details Selectable intermediate frequency sigma-delta analog-to-digital Selectable intermediate frequency sigma-delta analog-to-digital

1995-08-24

1997-03-04

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

H03M 300

Patent

active

056084005

ABSTRACT:
A sigma-delta analog-to-digital converter (10) provides high loop gain for suppression of noise components by use of a regenerative feedback loop or resonator (50), which produces a comb resonance response 212), embedded in the main degenerative feedback loop (48). The main loop includes an ADC (32) which samples at a clock frequency, which in turn defines a Nyquist frequency. The main loop also includes a DAC (38) which has a transfer function (42), which is equalized by a filter (44). The resonator (50) includes a low-pass filter (52) which matches the equalized main loop transfer function, a DC block (56), and a null filter (54) which nulls the resonator gain at the comb peak which lies above the Nyquist frequency. The open-loop transfer function of the regenerative loop (50) is set to unity gain and 0.degree..+-.N 360.degree. phase at the frequency of the analog input signal. A multipole embodiment (510) has multiple regenerative loops (55o) which produce multipole noise rejection (642). Resonators (751) are used in other .SIGMA..DELTA. ADCs (790, 890).

REFERENCES:
patent: 5103228 (1992-04-01), Voorman et al.
patent: 5243345 (1993-09-01), Naus et al.
patent: 5392042 (1995-02-01), Pellon

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