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Multi-channel single-choice D/A converter

A converter, multi-channel technology, applied in the direction of analog-to-digital converter, analog-to-digital conversion, code conversion, etc., can solve the problems of unfavorable production of integrated circuits, different resistance values, difficulty in ensuring accuracy, etc. The effect of matching, easy implementation and simple circuit structure

Inactive Publication Date: 2018-09-18
NANTONG UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that the resistance values ​​of each weight resistor are different. When there are many digits, the resistance values ​​are far apart, which brings great difficulties to ensure the accuracy, especially for the production of integrated circuits. Therefore, in the integrated DAC This circuit is rarely used alone in

Method used

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  • Multi-channel single-choice D/A converter
  • Multi-channel single-choice D/A converter
  • Multi-channel single-choice D/A converter

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specific Embodiment

[0032] Figure 6 yes Figure 5 As a specific implementation of the D / A converter shown, the number of digits of the D / A converter is 3.

[0033] Figure 6 The above is the overall circuit of the 3-bit D / A converter, in which the address decoder is as Figure 6 As shown in the lower left illustration, the EN port is the enable port, which can be used to control whether the D / A converter works or not. The transmission gates such as Figure 6 shown in the lower right inset.

[0034] The address decoder has three digital signal input terminals: D0, D1, D2, 8 output ports: Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7, and the 8 output ports are respectively connected with 8 transmission gates TG0, TG1 , TG2, TG3, TG4, TG5, TG6, TG7 control terminal connection.

[0035] The address decoder is composed of a series of inverters and AND gates in a certain way, and its connection is constrained by the following conditions: when any digital signal is input, there is one and only one output port t...

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Abstract

The invention discloses a D / A converter comprises 2m resistors of which the resistance is R, an address decoder, and 2m CMOS transmission gates, wherein the 2m resistors with the same resistance are connected in series to form a series resistor, one end of the first resistor in the series resistor is connected with a standard reference voltage end VREF, the address decoder has m digital signal input ports and 2m output ports, address decoding is performed according to a received digital signal, so that only one of the 2m output ports has high level, and the other output ports are low level, and the number of the output port outputting the high level is uniquely corresponding to a value corresponding to the input digital signal; each output port of the address decoder is separately connected with the control end of each CMOS transmission gate; the signal output ends of all CMOS transmission gates are connected with the analog signal output end of the D / A converter in parallel.

Description

technical field [0001] The present invention relates to a multi-channel single-selection D / A converter (analog / digital converter, Digital to Analog Converter, hereinafter referred to as DAC). Background technique [0002] D / A converter, referred to as DAC, is a circuit that converts digital quantities into analog quantities. It is mainly used in data transmission systems, automatic test equipment, medical information processing, digitization of TV signals, image signal processing and recognition, digital communication and voice. information processing, etc. The D / A converter basically consists of 4 parts, namely weight resistor network, operational amplifier, reference power supply and analog switch. A digital-to-analog converter is generally used in an analog-to-digital converter. The analog-to-digital converter is an A / D converter, or ADC for short, which is a device that converts continuous analog signals into discrete digital signals. [0003] DAC is mainly composed of...

Claims

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Application Information

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IPC IPC(8): H03M1/12H03M1/46
CPCH03M1/122H03M1/466
Inventor 尹海宏宋长青王志亮邵海宝
Owner NANTONG UNIVERSITY
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