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Digital-to-analogue converter

A technology of digital-to-analog converters and converters, applied in analog/digital conversion, code conversion, instruments, etc.

Active Publication Date: 2014-07-02
特励达易图威半导体股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Clearly, this switching mode is inconsistent with the RTZ mode; in the former, current from the source must be delivered to the load every clock half cycle; in the latter, current must be diverted from the load (to the supply) during this half cycle

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0026] figure 1 The principle of a return-to-zero converter according to the prior art is illustrated in simplified form.

[0027] The digital register REG receives the digital data elements to be converted in the form of binary words. For each bit, the register includes two outputs, an odd output providing the bit and an even output providing its complement. The converter has a number of parallel sections equal to the number of bits of the word to be converted. Only the two parts of the converter corresponding to the two bits of the register are shown in the figure. Only a portion corresponding to the output bit D and its complement Db will be specifically described. The outputs of the different sections are current outputs; for each section there is an odd output E1 and an even output E2; they are complementary; if the corresponding register bit is set to 1, the odd output supplies current (i.e., to the differential branch input current), if the register bit is set to 0,...

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PUM

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Abstract

The invention relates to digital-to-analog converters for converting current. The converter includes a pair of differential branches with two transistors controlled by a digital register activated at a clock frequency, and two resistive loads receiving the currents of the differential branches to produce a differential electrical signal representing the analog result of the conversion. The converter includes a dual switching circuit for the currents of the differential branches: a first switching circuit enables the transmission of the currents of the differential branches toward the loads for 70% to 95% of the clock period and shunts these currents outside the loads for the rest of the time; a second switching circuit alternately and symmetrically makes a direct link followed by a cross link between the differential branches and the loads. The converter provides a signal with high spectral purity and can work with a good level of power in the four Nyquist zones of the spectrum of the output analog signal, and notably in the second and third zones.

Description

technical field [0001] The invention relates to a digital-to-analog converter for converting electric current. The current converter consists of multiple current sources with identical or weighted values, preferably weighted to reduce circuit size; the digital signal to be converted is a binary word, the bits of which are used to individually control the different sources to enable Or block current flow from each source to a common load; the load acts as an analog adder since the voltage appearing at the load depends on the sum of the injected currents and represents the analog value of the input binary word. Background technique [0002] In practice, each current source provides a pair of differential branches, that is, an odd branch and an even branch; each branch includes a transistor, and the collector current represents the current of this branch; the two transistors are respectively input by bit and its complementary bit control. As a result, depending on the value o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/08H03M1/74
CPCH03M1/0863H03M1/0881H03M1/745
Inventor F·博雷M·温根德E·杜梅因
Owner 特励达易图威半导体股份有限公司