Design method of low-power-consumption current steering DAC circuit with sign bit thermometer codes

Abstract

The invention relates to a design method of a low-power-consumption current steering DAC circuit with sign bit thermometer codes. The method comprises the following steps: 1) decoding high 3-bit data bits D5, D6 and D7 by using a thermometer, and decoding other low 5-bit data bits D0-D4 by using binary codes; and 2) setting D7 as a sign bit Q7, and controlling a current source 0-11 through a data bit D0-D6 and a sign bit Q7 switch. According to the method, the code loss phenomenon caused by large weight difference of high-resolution DAC code elements and the complex decoding mode caused by temperature codes are improved, the sign bits can increase or decrease the excitation current of the sensor DAC, and the excitation magnitude can be accurately controlled through external digital signals.

Description

technical field [0001] The invention relates to the fields of aviation, navigation, industrial control and the like, in particular to a design method of a low-power current rudder DAC circuit with sign bit thermometer code. Background technique [0002] A DAC (Digital to Analog Converter) is a device that converts a digital signal into an analog signal (in the form of current, voltage, or charge). In many digital systems (such as computers), signals are stored and transmitted digitally, and a digital-to-analog converter converts such signals into analog signals so that they can be recognized by the outside world (humans or other non-digital systems). [0003] The DAC in the existing solution mostly adopts binary weighting type or temperature code type, which is relatively limited. The disadvantage of binary weighted or thermometer code DACs is that the binary weighted type has a large weight difference between high-order symbols and low-order symbols for high-resolution DAC...

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