Analog-to-digital converter with local feedback

Details Analog-to-digital converter with local feedback Analog-to-digital converter with local feedback

1995-06-07

1997-08-05

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341155, H03M 300

Patent

active

056547110

ABSTRACT:
An analog-to-digital converter is provided for converting an analog signal to a digital signal and for maintaining a linear gain relationship therebetween, regardless of the analog input signal full scale voltage. The analog-to-digital converter utilizes oversampling and delta-sigma techniques within a cascaded, multiple order circuit arrangement. A local feedback loop is coupled across the output and input nodes of at least one latter order integrator within the first stage and subsequent stage of the cascaded analog-to-digital converter. The local feedback loop monitors the output from the connected integrator and modifies that output through local feedback to ensure the input level of the second and subsequent stages is optimally maintained. Proper scaling of the latter stages ensures that quantization noise caused by the first stage is cancelled, and that any and all direct noise leakage from the first stage does not enter into the digital signal produced by the noise cancellation circuit.

REFERENCES:
patent: 4851841 (1989-07-01), Sooch
patent: 4920544 (1990-04-01), Endo et al.
patent: 5061928 (1991-10-01), Karema et al.
patent: 5148166 (1992-09-01), Ribner
patent: 5148167 (1992-09-01), Ribner
Franca, et al., "Design of Analog --Digital VLSI Circuits for Telecommunications and Signal Processing", 2nd Edition, Prentice Hall, pp. 251-289.
Hogenauer, "An Economical Class of Digital Filters for Decimation and Interpolation", IEEE Trans. on Acoustics, Speech and Signal Processing, vol. ASSP-29, No. 2 (Apr., 1981).
Chu, et al. "Multirate Filter Designs Using Comb Filters", IEEE Trans. on Circuits and Systems, vol. CAS-31, pp. 913-924 (Nov., 1984).
Moussavi, et al., "High-Order Single-Stage Single-Bit Oversampling A/D Converters Stabilized with Local Feedback Loops", IEEE Trans. on Circuits and Systems, vol. 41, No. 1, pp. 19-25 (Jan., 1994).
Crochiere, et al., "Interpolation and Decimation of Digital Signals --A Tutorial Review", Proc. IEEE, vol. 69, pp. 300-311 (Mar., 1981).

Affiliated with

Also associated with

Rating

Analog-to-digital converter with local feedback does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Analog-to-digital converter with local feedback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog-to-digital converter with local feedback will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1077878