Current-steering type digital-to-analog converter
A digital-to-analog converter and current rudder technology, applied in the field of current-rudder type digital-to-analog converters, can solve problems such as affecting the stability of the current source, digital signal glitches, affecting the analog output signal-to-noise ratio, etc.
Active Publication Date: 2014-06-04
ALLWINNER TECH CO LTD
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Problems solved by technology
[0010] In summary, the current steering digital-to-analog converter in the prior art has the following defects: the current switch easily enters the linear region, so that the change of the output point voltage affects the stability of the current source, and further affects the dynamic performance of the system; The current switch is in the protection state when it is turned on, but because the conversion of each digital signal is not performed at the same time, certain glitches will be generated during the conversion of the digital signal, which further affects the signal-to-noise ratio of the analog output
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[0052] Figure 5 It is a schematic structural diagram of the first embodiment of the current steering digital-to-analog converter of the present invention, as Figure 5 As shown, this DAC includes a current source I IN , current switch SW 1 and SW 2 , data alignment circuit 301, switch drive circuit 302, voltage regulator 303, current switch SW 1 and SW 2 The output terminals are respectively connected to the load resistor R 10 and R 20 . Current source I IN connected to the first voltage source V DD and current switch SW 1 and SW 2 Between the public end a. The output end of the data alignment circuit 301 is connected to the digital input end of the switch driving circuit 302 , and the data alignment circuit 301 sends the aligned digital signals dd and d to the switch driving circuit 302 . The output end of the voltage regulator 303 is connected with the voltage input end of the switch drive circuit 302, and the turn-on voltage V generated by the on output to the...
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The invention discloses a current-steering type digital-to-analog converter, which comprises a current source, a data alignment circuit, a switch drive circuit, a voltage regulator and at least two current switches, wherein the data alignment circuit is used for outputting digital signals which are subjected to alignment processing to the switch drive circuit, the voltage regulator is used for generating and outputting a turn-on voltage to the switch drive circuit, and the switch drive circuit is used for controlling a current to flow through different loads according to a current switch control signal obtained from the alignment processing, so that an output voltage is generated. According to the current-steering type digital-to-analog converter, the current switches can be ensured to be in a saturated state when the current switches are switched on, so that the dynamic performance of a system can be stable, and the nonlinear distortion of the system is effectively inhibited; meanwhile, the current switches can be ensured not to be switched off at the same moment, the conversion of the digital signals can be simultaneously carried out, and consequently, the introduction of noise to the system is effectively inhibited.
Description
technical field [0001] The invention relates to a current steering type digital-to-analog converter, in particular to a current steering type digital-to-analog converter capable of suppressing the nonlinear distortion of the system and suppressing the noise introduced by the system. Background technique [0002] In video signal processing and communication systems, high-speed and high-precision digital-to-analog converters are one of the most important modules. Current Steering Digital to Analog Converter (Current Steering Digital to Analog Converter) is based on a very highly matched current source array, which can directly drive resistive loads, and its response speed is significantly better than that of voltage-type digital-to-analog converters, so it has been widely used . [0003] The evaluation index of digital-to-analog converter can be divided into static and dynamic two kinds. Static indicators include: integral nonlinearity, differential nonlinearity, gain error ...
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IPC IPC(8): H03M1/66
Inventor 王洪魁
Owner ALLWINNER TECH CO LTD