Digital signal requantizing circuit using multistage noise shapi

Details Digital signal requantizing circuit using multistage noise shapi Digital signal requantizing circuit using multistage noise shapi

1991-04-05

1992-06-23

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from differential codes

341143, 375 27, H03M 304

Patent

active

051247038

ABSTRACT:
In a digital signal noise shaping requantization circuit formed of a first delta-sigma quantizer (main loop) for executing noise shaping of an input digital signal and a second delta-sigma quantizer (sub-loop) which receives as input signal the quantization error of a local quantizer in the first delta-sigma quantizer, and whose output signal is differentiated and added to the output signal from the first delta-sigma quantizer, the second delta-sigma quantizer includes a feedback circuit for operating on a quantization error of a local quantizer therein, with a predetermined transfer function. The output signal from the feedback circuit, in addition to being fed back to the input of the second delta-sigma quantizer, is also applied to control the operation of the first delta-sigma quantizer such as to modify the value of quantization error of the local quantizer of the first delta-sigma quantizer, for thereby ensuring stable and effective operation of the second delta-sigma quantizer even when the input digital signal attains a high amplitude.

REFERENCES:
patent: 4704600 (1987-11-01), Uchimura
patent: 5027119 (1991-06-01), Toyomaki
"A 17-Bit Oversampling D-to-A Conversion Technology Using Multistage Noise Shaping", by Yasuyuki Matsuya et al., IEEE Journal of Solid-State Circuits, vol. 24, No. 4, Aug. 1989.

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