Current rudder type digital-to-analogue conversion circuit with burr inhibiting ability

Abstract

The invention discloses a current rudder type digital-to-analogue conversion circuit with the burr inhibiting ability. The current rudder type digital-to-analogue conversion circuit comprises a register, a decoder, a latch, a current source array and an output circuit. According to the digital-to-analogue conversion circuit, two-end output is carried out in a complementary mode, a plurality of differential output current sources are connected in parallel to form the current source array, and the decoder controls the state of each current source gating switch of the current source array according to different input data of the digital-to-analogue conversion circuit, and further controls output currents to flow to the differential output end A or the differential output end B so that output values can correspond to the input data in a one-to-one mode; the output circuit is connected with the differential output of the current source array, and the output of the current source array is connected with the load after being mirrored through a current mirror one or more times. The digital-to-analogue conversion circuit can effectively lower current burrs of the output end of a DAC, and can be directly combined and used together with other current source structures under the circumstance of not modifying the whole structure of the circuit.

Description

technical field [0001] The invention relates to a current steering type digital-to-analog conversion circuit, in particular to a current steering type digital-to-analog conversion circuit with glitch suppression capability. Background technique [0002] With the rapid development of digital television technology, a high-speed, higher-resolution DAC (Digital to analog converter, digital-to-analog converter) becomes essential. Among them, the current steering DAC has been widely used in video systems such as high-definition TVs and digital TV set-top boxes due to its fast speed, high linearity, and high efficiency. [0003] The basic structure of the current steering DAC is as follows figure 1 As shown, the current steering DAC (Current Steering DAC) is composed of registers, decoders, latches, and current source arrays. The switch of each current unit makes the output of the current unit flow to the IA terminal or the IB terminal, and then drives an external load. [0004]...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned current structure is simple, but in the process of changing SWA and SWB, due to parasitic capacitive coupling, etc., it will cause a large current glitch in the load connected to IOA and IOB, which often affects the dynamic parameters and static parameters of the entire DAC. influence, so it is necessary to seek novel circuit structures

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