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Current-steering digital-analog converter and current-steering digital analog conversion method

A technology of current steering digital and analog converters, applied in the direction of digital analog converters, analog/digital conversion, code conversion, etc., can solve the problems of shortened current turn-on time, increased circuit power consumption, loss of circuit efficiency, etc., to avoid functional Low power consumption, small disturbance, and elimination of harmonic distortion

Active Publication Date: 2017-06-23
SANECHIPS TECH CO LTD
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Problems solved by technology

[0008] Figure 4 Although the RZ switching method eliminates the harmonic distortion caused by the above ISI, it will lose the efficiency of the circuit part because the current is only turned on for a part of a clock cycle; The speed requirements of the unit circuit, especially the subsequent I2V buffer, will increase with the shortening of the switching time, that is, the power consumption of the circuit will increase

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Embodiment Construction

[0045] In order to understand the characteristics and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present invention.

[0046] The current-steer digital-to-analog converter of the embodiment of the present invention is a novel equal-opportunity perturbation CS DAC, which generates two RZ current waveforms in one data period through two current switches at a clock frequency twice that of the digital data, whichever The results are summed and stitched into an approximate NRZ output waveform. Alternatively, a shuffle circuit is introduced into the switch logic control module, and by turning on and off the two current switches in turn, a rising edge is introduced into the current output corresp...

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Abstract

The invention discloses a current-steering digital-analog converter and a current-steering digital analog conversion method. The converter comprises a digital input circuit which is used for receiving the input of digital data, and enabling the digital data to be transmitted to a row decoder and a column decoder; a shuffling circuit which is connected with the row decoder and the column decoder, is used for generating a switching sequence, and enables the switching sequence to be transmitted to the row decoder and the column decoder; the row decoder and the column decoder which are respectively connected with a digital input circuit, and is used for respectively converting the row and column data of digital data into corresponding thermometer codes through combining with the switching sequence and transmitting the converted thermometer codes to a current source matrix; the current source matrix which is used for controlling the on / off of a current according to the received thermometer codes and outputting current data; a current and voltage converter which is connected with the current source matrix and is used for converting the current data into voltage data.

Description

technical field [0001] The invention relates to integrated circuit technology, in particular to a current steering digital-to-analog converter and a current steering digital-to-analog conversion method. Background technique [0002] The development of communication technology has put forward higher requirements for the speed and precision of digital-to-analog converters (DACs, Digital to Analog Converters). High-definition video and high-quality calls all require high-speed DACs. Current Steering Digital to Analog Converters (CS DAC, Current Steering Digital to Analog Converters) can effectively alleviate this contradiction. Different from DACs with other structures, CS DAC has a simple structure, consisting of a binary current source or a current source matrix, plus a current switch controlled by a binary number or a thermometer code controller converted by a decoder. The current of the current source can be switched to a resistor directly grounded by a switch (high-speed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/06H03M1/66
CPCH03M1/06H03M1/0614H03M1/66
Inventor 易律凡赵春河
Owner SANECHIPS TECH CO LTD
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