Unit current source circuit applied to high-speed and high-precision current steering DAC

Abstract

The invention discloses a unit current source circuit applied to a high-speed and high-precision current steering DAC. The circuit mainly comprises a synchronous low-voltage low-cross-point differential control drive signal generation circuit, a band-gap reference and voltage management circuit and a unit current generation circuit. The synchronous low-voltage low-cross-point differential controldrive signal generation circuit is connected with the unit current generation circuit. The unit current generation circuit is connected with the band-gap reference and voltage management circuit, wherein the synchronous low-voltage low-crossing point differential control driving signal generation circuit is used for generating synchronous low-voltage low-crossing point differential signals to prevent the situation that the current source is unstable due to simultaneous closing of the differential switches; the band-gap reference and voltage management circuit is used for providing stable reference voltage which does not change along with temperature, obtaining bias voltage of a unit current source after simple voltage change and obtaining low voltage of the synchronous low-voltage low-cross-point differential control driving signal generation circuit; the unit current generating circuit generates unit current which is stable, accurate and wide in application bandwidth. Compared with the traditional unit current source, the obtained output current is more stable, the precision is higher, and the applicable working frequency is wider.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a unit current source circuit applied to a high-speed and high-precision current steering DAC. Background technique [0002] The digital world and the analog world rely on two common basic components, the DAC and the ADC, to communicate. Modern society is moving towards digitization, but the living environment we actually come into contact with is still analog, and in some practical computing applications, it is often necessary to directly process analog quantities that change continuously over time, for example, in process control devices. It needs to be controlled by analog signals. In some cases, it may also be some physical quantities that are not electrical signals, such as speed, temperature, pressure, etc. At this time, the non-electrical analog signals must be converted into corresponding ones through sensors. analog signal. The accuracy of...

AI Technical Summary

Problems solved by technology

[0005] The traditional unit current source does not deal with clock feedthrough and charge injection effects and does not use differential switches, so the fluctuation of the traditional current source is significantly larger than the design parameter value

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