US 2022/0416808 A1 · QUANTIZER FOR SIGMA-DELTA MODULATOR, SIGMA-DELTA MODULATOR, AND NOISE-SHAPED METHOD

Abstract

A quantizer for a sigma-delta modulator, a sigma-delta modulator, and a method of shaping noise are provided. The quantizer includes: an integrator configured to generate, in a Kth sampling period, a quantization error signal for a Kth period according to an internal signal, a quantization error signal for a (K−1)th period, a filtered quantization error signal for the (K−1)th period and a filtered quantization error signal for a (K−2)th period; an integrating capacitor configured to store the quantization error signal for the Kth period, to weight the internal signal in a (K+1)th sampling period; a passive low-pass filter configured to acquire the quantization error signal for the Kth period in a Kth discharge period, and feed back the filtered quantization error signal to the integrator in a (K+1)th sampling period and a (K+2)th sampling period; and a comparator configured to quantize the quantization error signal for the Kth period.

Claims14

Dependent claims

A quantizer for a sigma-delta modulator, comprising:

an integrator configured to generate, in a Kth sampling period, a quantization error signal for a Kth period according to an internal signal, a quantization error signal for a (K−1)th period, a filtered quantization error signal for the (K−1)th period, and a filtered quantization error signal for a (K−2)th period, wherein K is a positive integer greater than 1;
an integrating capacitor configured to store the quantization error signal for the Kth period, so as to weight the internal signal in a (K+1)th sampling period;
a passive low-pass filter configured to acquire the quantization error signal for the Kth period in a Kth discharge period, generate a filtered quantization error signal according to the quantization error signal, and feedback the filtered quantization error signal to the integrator in a (K+1)th sampling period and a (K+2)th sampling period;
and
a comparator configured to quantize the quantization error signal for the Kth period in the Kth discharge period, so as to output a digital code.

2 more elements

A method of shaping noise, comprising:

acquiring, by using an integrator in a Kth sampling period, an internal signal, a quantization error signal for a (K−1)th period stored on an integrating capacitor, a filtered quantization error signal for the (K−1)th period fed back by a passive low-pass filter, and a filtered quantization error signal for a (K−2)th period fed back by the passive low-pass filter, and generating a quantization error signal for a kth period accordingly, wherein the quantization error signal for the Kth period is stored on the integrating capacitor, so as to weight the internal signal in a (K+1)th sampling period, wherein K is a positive integer greater than 1;
acquiring, by using the passive low-pass filter in a Kth discharge period, the quantization error signal for the kth period, and generating a filtered quantization error signal according to the quantization error signal, so as to feed back the filtered quantization error signal to the integrator in a (K+1)th sampling period and a (K+2)th sampling period;
and
quantizing the quantization error signal for the Kth period by using a comparator, so as to output a digital code.

1 more element

Dependencies are inferred from the claim text.

Quantizer for sigma-delta modulator, sigma-delta modulator, and noise-shaped method

Life of this patent

Quantizer for sigma-delta modulator, sigma-delta modulator, and noise-shaped method

Life of this patent

Abstract

Claims14