Digital to Analog Converter

A digital-to-analog converter and digital-to-analog conversion circuit technology, applied in analog/digital conversion, code conversion, instruments, etc., can solve the application requirements, complex timing, high power consumption and other problems that cannot meet the low power consumption of handheld communication equipment , to achieve the effect of saving power consumption, simplifying circuit structure and reducing power consumption
CN105187066BActive Publication Date: 2018-06-05GUANGZHOU RUNXIN INFORMATION TECH +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOU RUNXIN INFORMATION TECH
Publication Date
2018-06-05

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Abstract

The digital-to-analog converter includes a first-stage SAR-type sub-digital-to-analog conversion circuit, a second-stage SAR-type sub-digital-to-analog conversion circuit, an error amplifier circuit, and a digital error correction circuit; the first-stage SAR-type sub-digital-to-analog conversion circuit is used for input The signal is subjected to 6-bit primary quantization processing to obtain and output the high 6-bit signal to the digital error correction circuit, and output the remaining residual signal to the error amplifier circuit; the error amplifier circuit is used to amplify the residual signal and convert the amplified The signal is sent to the second-stage digital-to-analog conversion circuit; the second-stage SAR-type sub-digital-to-analog conversion circuit is used to perform 7-bit sub-quantization processing on the amplified signal to obtain and output the lower 7-bit signal to the digital error Correction circuit; the second-stage SAR-type sub-digital-to-analog conversion circuit and the first-stage SAR-type sub-digital-to-analog conversion circuit use the same reference voltage; the digital error correction circuit is used to add the high 6-bit signal and the low 7-bit signal for misalignment , to get a 12-bit digital quantization signal. The invention has simple structure and can effectively save power consumption.
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Description

technical field

[0001] The invention relates to a digital-to-analog converter. Background technique

[0002] The successive approximation digital-to-analog converter, also known as the SAR ADC, uses a binary method algorithm to sequentially compare the input signal with the reference level to obtain the digital quantization result of the input signal. This serial comparison method makes the SAR ADC have the advantage of low power consumption compared with other types of ADCs, such as parallel (ie flash) and pipeline (ie pipeline) ADCs.

[0003] The serial quantization method of the SAR ADC also limits the quantization speed of this ADC. In modern communication, it is necessary to transmit a large amount of multimedia information such as pictures and videos, and the bandwidth is extended to the order of 10Mhz, and the precision is required to be above 10bit. The SAR ADC seems to be stretched for such precision and speed communication requirements.

[0004] Such as figure 1...

Claims

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