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4n+1 layer capacitive DAC using n capacitors

A technology of capacitors and capacitor pairs, applied in the field of digital/analog converters, can solve problems such as inaccurate direct transmission to signals, difficult compensation, etc.

Active Publication Date: 2018-11-06
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the DAC output resides at the modulator's input, the inaccuracies of the DAC are directly transmitted to the signal and difficult to compensate for

Method used

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  • 4n+1 layer capacitive DAC using n capacitors
  • 4n+1 layer capacitive DAC using n capacitors
  • 4n+1 layer capacitive DAC using n capacitors

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Embodiment Construction

[0028] The invention and its various features and advantageous details are explained more fully with reference to exemplary (and therefore non-limiting) embodiments illustrated in the drawings and detailed in the following description. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments, are given by way of illustration only and not limitation. Descriptions of known programming techniques, computer software, hardware, operating platforms and protocols may be omitted so as not to unnecessarily obscure the invention in detail. Various substitutions, modifications, additions and / or rearrangements within the spirit and / or scope of the basic inventive concept will be apparent to those skilled in the art from the present invention.

[0029] refer again figure 1 , which depicts multiple bits or layers (nlev layers, nlev>2, M bits, M=Floor(log 2 (nlev)), M>1) Schematic block diagram of a single-loop sigma-del...

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Abstract

A digital-to-analog converter DAC of the charge transfer type for use in a ΣΔ modulator comprising a capacitor switching unit operable to generate 4n+1 output levels, the capacitor switching unit comprising: a plurality of second switching units , for coupling the first terminals of a plurality of reference capacitor pairs with a positive or negative reference signal; wherein the second terminals of the plurality of reference capacitor pairs are respectively coupled in parallel; wherein a single switching combination is provided for even transitions to achieve linearity, And where the average of different switching combinations is provided for odd transitions to achieve linearity; where even transitions are when the input to the DAC is even and odd transitions are when the input to the DAC is odd.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to commonly owned U.S. Provisional Patent Application Serial No. 61 / 776,596 filed March 11, 2013; which is hereby incorporated by reference for all purposes . technical field [0003] The present invention relates to digital-to-analog converters (DACs), in particular to the use of such DACs in ΣΔ modulators. Background technique [0004] Today, analog-to-digital converters are widely used in electronic devices for consumer applications, industrial applications, and the like. Typically, an analog-to-digital converter includes circuitry for receiving an analog input signal and outputting a digital value proportional to the analog input signal. This digital output value is usually in the form of a parallel word or a serial string of digital bits. There are many types of analog-to-digital conversion schemes, such as voltage-to-frequency conversion, charge redistribution, delta modulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/06H03M3/04
CPCH03M1/0665H03M3/464H03M3/424H03M1/802H03M3/30
Inventor 文森特·奎奎姆普瓦
Owner MICROCHIP TECH INC