Control method for mixing digital-to-analogue converter (DAC) switching circuit

Abstract

The invention discloses a control method for a mixing digital-to-analogue converter (DAC) switching circuit. The control method comprises that: a DAC switching circuit is constructed, wherein the DAC switching circuit comprises a unit decoding circuit, a mode selection circuit and a switch array; the unit decoding circuit decodes an input digital signal and outputs the signal to the mode selection circuit; the mode selection circuit selects an output mode of the switch array according to a mode control signal, converts the signal input by the unit decoding unit into a switching selection signal according to the output mode and outputs the switching selection signal to the switch array; and the switch array generates analogue output according to the switching selection signal. By the control method, the shortcomings that the output noises of a conventional high-performance DAC are relatively more dependent on input control switching signals and that an output signal frequency range is limited are overcome, the static linearity of the DAC is improved, the dynamic range of the static linearity is widened, the function of multimode up-conversion is realized at the same time, and the DAC is endowed with the function of a mixer.

Description

Technical field [0001] The invention relates to a control method of a mixing DAC switch circuit. Background technique [0002] In the design of electronic circuits, the noise problem has become more and more the bottleneck of the design, and it will become more and more serious as the dynamic range increases and the energy of the signal decreases. In mixed-signal applications, the continuous change of digital signals is the main source of noise that affects the normal operation of analog signals. In the digital-to-analog converter DAC, the switch that controls the output of the analog signal is controlled by a digital signal. The constantly changing digital signal will produce noise in the analog output section. In a practically achievable system, it is impossible to completely isolate these noises, because they are coupled to them through the control unit of the analog signal, and also because of the inherent power consumption of digital circuits, the time dependence of the lo...

AI Technical Summary

Problems solved by technology

[0005] While the traditional double differential switch architecture has the ability to eliminate the non-linearity problems caused by non-ideal switching, it has little effect on those non-linearities related to the input data

The frequency of the output signal at the same time can only be located in the first Nyquist range, and the up-conversion function cannot be realized for the output signal

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