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A digital-to-analog converter

A digital-to-analog converter and decoder technology, applied in digital-to-analog converters, analog-to-digital conversion, code conversion, etc., can solve the problems of output analog signal linearity decline and other problems

Active Publication Date: 2020-10-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This strong correlation directly leads to a decrease in the linearity of the output analog signal

Method used

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  • A digital-to-analog converter
  • A digital-to-analog converter
  • A digital-to-analog converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment provides a digital-to-analog converter, such as figure 1 As shown, including decoder, action unit array and adder:

[0069] The decoder includes a digital input terminal and an output terminal; the digital input terminal receives a digital input signal; the decoder generates a set of state control signals according to the digital input signal to control the state switching of the action unit array; the decoder The maximum number of states of the digital input signal is less than the number of state control signals output by the decoder.

[0070] The action unit array includes one or more of a current source switch unit, a resistance switch unit, or a capacitance switch unit. The input end of the action unit array is connected to a decoder, and its output is connected to an adder. The action unit The array receives the state control signal output by the decoder, completes state switching according to the state control signal, and generates a set of analo...

Embodiment 2

[0092] In this example, if image 3 As shown, the decoder also includes the following variants:

[0093] The storage unit includes an input terminal, the input terminal is connected to the digital input terminal of the decoder, and the output terminal is connected to the arithmetic unit, which outputs the digital signal stored in the storage unit several cycles ago;

[0094] The arithmetic unit includes three input terminals, the first input terminal of which is the first input terminal of the decoder, connected to the digital input terminal of the digital-to-analog converter, and the second input terminal of which is the second input terminal of the decoder terminal, connected to the mode control input terminal of the digital-to-analog converter, its third input terminal connected to the output terminal of the storage unit; its output terminal connected to the control signal unit.

[0095] The operation unit is used to output the decoder output state control signal correspon...

Embodiment 3

[0099] In this example, if Figure 4 As shown, the decoder also includes the following variants:

[0100] storage unit:

[0101] Its input is connected to the output of the decoder;

[0102] Its output terminal is connected to the arithmetic unit, and outputs the digital signal stored in the storage unit several cycles ago;

[0103] Operation unit:

[0104] Its first input terminal is the digital input terminal of the decoder, which is connected to the digital input terminal of the digital-to-analog converter;

[0105] Its second input terminal is the mode input terminal of the decoder, which is connected to the mode control input terminal of the digital-to-analog converter;

[0106] Its third input terminal is connected to the output terminal of the storage unit;

[0107] Its output is connected to the control signal unit.

[0108] The operation unit is used to output the decoder output state control signal corresponding to the digital input signal of the current clock ...

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Abstract

The invention provides a digital to analog converter comprising a decoder, an action unit array and an adder, wherein the decoder comprises a digital input end and an output end; the digital input endreceives a digital input signal; the decoder generates a group of state control signals according to the digital input signal so as to control the state switching of the action unit array; the actionunit array comprises one or more of a current source switch unit, a resistor switch unit, or a capacitor switch unit, the input end of the action unit array is connected with the decoder, the outputof the action unit array is connected to the adder, the action unit array receives the state control signals output by the decoder, completes the state switching according to the state control signals, and forms a group of analog signals; and the adder is used for performing a summation operation according to the analog signals output by the action unit array to form an analog output signal.

Description

technical field [0001] The present invention relates to the technical field of digital-to-analog conversion circuits, and more particularly, to a digital-to-analog converter. Background technique [0002] Digital-to-analog converter (DAC), also known as D / A converter, or DAC for short, is a device that converts digital quantities into analog. The digital-to-analog converter device can be used as an independent digital-to-analog converter chip for signal processing, military In the fields of communication, radar, electronic countermeasures, etc., it can also be used as an IP or sub-module for DDS, RF analog front-end and various high-precision SOC systems to realize the function of converting digital signals into analog signal output. The analog-to-digital converter is a circuit that converts analog signals into digital signals, also referred to as A / D converter or ADC. The function of A / D conversion is to convert time-continuous and amplitude-continuous analog quantities int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
CPCH03M1/665
Inventor 赖龙强李学清杨华中
Owner TSINGHUA UNIV
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