Ultra-low-power analog-to-digital converter with operational amplifier slew rate prediction function

Abstract

The invention relates to an ultra-low-power analog-to-digital converter with an operational amplifier slew rate prediction function. The ultra-low-power analog-to-digital converter comprises an integrator, a quantizer and a slew rate prediction circuit. A signal output end of the analog-to-digital converter inputs a signal into the slew rate prediction circuit. An output end of the slew rate prediction circuit controls an output-level current of a first-level transconductance operational amplifier in the integrator. The first-level transconductance operational amplifier comprises at least one adjustable output-level current module. According to the ultra-low-power analog-to-digital converter, the slew rate prediction circuit and the adjustable output-level current folding transconductance amplifier are innovatively provided according to the currents of slew rate demands needing to be satisfied by the first-level transconductance amplifier of the sigma delta circuit under different situations; and on this basis, the method of finely controlling the output-level current of the transconductance amplifier according to different slew rate demands is provided, thereby achieving the purpose of designing the low-power sigma delta circuit.

Description

technical field [0001] The invention relates to an ultra-low power consumption analog-to-digital converter with the function of predicting the slew rate of an operational amplifier, in particular to an adjustable output stage transconductance amplifier, which belongs to the field of electric power technology. Background technique [0002] Sigma delta analog-to-digital converter has high precision characteristics and has been widely used in many fields. With the popularity of portable devices and the Internet of Things, low-power sigma delta modulators have become the focus of research and design. At present, there are mainly two ways to realize sigma delta modulation: continuous type and discrete type. Since the discrete type sigma delta modulator has good robustness and reusability, the low power consumption design of the discrete type sigma delta modulator becomes a A hot spot right now. However, for a discrete sigma delta modulator, the first-stage transconductance ampl...

AI Technical Summary

Problems solved by technology

Among them, the noise is mainly determined by the KT / C noise, and the unity gain bandwidth is mainly determined by the sampling frequency. There is not much room for optimization of the two.

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