Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1993-10-25
1995-08-15
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
375244, H03M 302
Patent
active
054423538
ABSTRACT:
A bandpass sigma-delta analog-to-digital converter (ADC) (10) includes first (11) and second (12) bandpass sigma-delta modulators, and a digital filter (13) connected to digital outputs thereof. In the illustrated embodiment, the first bandpass sigma-delta modulator (11) is a second-order, single bit bandpass modulator, and the second bandpass sigma-delta modulator (12) is a first-order, multiple-bit modulator. Coefficients in feedback paths of the first (11) and second (12) modulators are derived from a transfer function of the digital filter. In one embodiment, a receiver (50) for a system such as frequency modulation (FM) radio converts an intermediate frequency (IF) analog signal to digital in-phase (I) and quaternary (Q) signals using the bandpass sigma-delta ADC (10).
REFERENCES:
patent: 5027120 (1991-06-01), Thurston
patent: 5084702 (1992-01-01), Ribner
patent: 5103229 (1992-04-01), Ribner
patent: 5124705 (1992-06-01), Voorman
patent: 5153593 (1992-10-01), Walden et al.
patent: 5181032 (1993-01-01), Ribner
patent: 5198817 (1993-03-01), Walden et al.
patent: 5283578 (1994-02-01), Ribner et al.
patent: 5341135 (1994-08-01), Pearce
patent: 5345406 (1994-09-01), Williams
Schreier, et al.; "Bandpass Sigma-Delta Modulation;" Electronics Letters; vol. 25, No. 23, pp. 1560-1561, (1989).
Pearce, et al.; "The application of DSP techniques in HF Radio Receiver Design," Fourth Internat'l Conf., Publ. No. 284, pp. 205-209, (1988).
R. Schreier, et al.; "Multibit Bandpass Delta-Sigma Modulators Using N-Path Structures," IEEE 1992; pp. 593-596.
Gerhard Troster, et al.; "An Interpolative Bandpass Converter on a 1.2-.mu.m BiCMOS Analog/Digital Array;" IEEE Journal of Solid-State Circuits, Vol. 28, No. 4, Apr. 1993; PP. 471-477.
Hoff Marc S.
Motorola Inc.
Polansky Paul J.
LandOfFree
Bandpass sigma-delta analog-to-digital converter (ADC), method t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bandpass sigma-delta analog-to-digital converter (ADC), method t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bandpass sigma-delta analog-to-digital converter (ADC), method t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2185500