Discrete low-power consumption integrator for delta-sigma modulator

Abstract

The invention discloses a discrete type low-power consumption integrator for a delta-sigma modulator. The discrete type low power consumption integrator comprises a clock generation sub-module, a first feedback integral sub-module, a second feedback integral sub-module and an integral amplifier, the clock generation sub-module comprises a first output end, a second output end, a third output end and a fourth output end; and the clock generation sub-module circuit is connected with the first feedback integral sub-module, the second feedback integral sub-module and the integral amplifier throughthe output end of the clock generation sub-module circuit, and generates clock pulses with different phase frequencies to control the first feedback integral sub-module, the second feedback integralsub-module and the integral amplifier. The invention also provides a method for controlling the enable end of the integral amplifier by using the clock, which is used for reducing the power consumption of the integrator. According to the integrator, nonlinear distortion can be effectively reduced, the problem of voltage overshoot caused by switching can be greatly reduced, and the power consumption of the whole modulator can be greatly reduced by utilizing the integrator.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and more specifically relates to a discrete low-power integrator used for a delta-sigma modulator. Background technique [0002] Analog-to-digital converters (ADCs) play an important role in signal processing as a bridge between the digital and analog worlds. It has a wide range of applications in the fields of digital audio, image coding, frequency synthesis and various sensors. At present, the delta-sigma ADC based on oversampling and noise shaping technology is mainly used in systems with high precision, low voltage and low power consumption. The Delta-sigma modulator structure is mainly composed of three modules: 1) Loop filter, which determines the noise transfer function; 2) Quantizer, usually using a 1-bit quantizer, although a multi-bit quantizer can improve the noise shaping capability of the system, However, there will be nonlinear effects, and an additional dynamic device matching ...

AI Technical Summary

Problems solved by technology

[0004] For the widely used switched capacitor delta-sigma modulator, the core part is the design of the integrator, because the traditional structure of the switched capacitor integrator uses too many switches, resulting in a large number of nonlinear harmonic distortion

At the same time, due to the nonlinear on-resistance of the switch itself and non-ideal factors such as charge leakage and clock feedthrough, it will have a serious impact on the overall performance of the modulator.

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