Power consumption reduction circuit and method for current steering DAC

Abstract

The invention provides a power consumption reduction circuit for a current steering DAC. The power consumption reduction circuit comprises a comparison-control circuit; the comparison-control circuitis configured to sample an input signal of a current sampling period in each sampling period, at least take a condition that an input signal of the current sampling period and the input signal of a previous sampling period are the same as a judgment condition and control the driving latch circuit to be enabled and update an output value of the driving latch circuit when at least one judgement condtion is met. Otherwise, the latch circuit is driven to maintain the latch state so as to maintain the output of the previous sampling period. The invention also provides a power consumption reductionmethod for the current steering DAC. According to the power consumption reduction circuit for the current steering DAC, whether the digital code input into the DAC is changed or not is detected through comparison-control, the working state of a rear-stage latch circuit is controlled, the switching frequency of the latch circuit can be reduced, and the dynamic power consumption of the DAC circuit is reduced.

Description

technical field [0001] The invention belongs to the field of analog circuit design, and in particular relates to a circuit and method for reducing power consumption of a current steering DAC. Background technique [0002] As a link between digital and analog signals, digital-to-analog converter (DAC) plays an important role in the fields of modern communications, aerospace, projection imaging, and integrated manufacturing, and is an important component of wireless transceiver systems. In the wireless transceiver system, the analog-to-digital converter (ADC) and the digital-to-analog converter act as a bridge between the analog and digital worlds. The ADC converts the analog signal into a digital signal (N-bit digital code) for processing, and then converts the digital signal ( N-bit digital code) is converted into an analog signal output. [0003] At present, current steering DAC is used in high-speed and high-precision applications. Compared with other DAC architectures, t...

AI Technical Summary

Problems solved by technology

Secondly, the dormancy brought by this PD mode makes the entire DAC system stop working, which cannot meet the power saving requirements of the DAC in the working state.

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