N-bit digital-to-analog conversion apparatus

An analog conversion and digital technology, applied in the field of N-bit digital-to-analog conversion devices, can solve problems such as lowering the spurious-free dynamic range
CN102739256AInactive Publication Date: 2012-10-17SPRING FOUND OF NCTU
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
SPRING FOUND OF NCTU
Publication Date
2012-10-17
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The invention relates to an N-bit digital-to-analog conversion apparatus, which is used for receiving a digital signal and a clock signal. The clock signal is switched between a first state and a second state. Besides, the N-bit digital-to-analog conversion apparatus comprises a decoder, a random number generator and a conversion module. More specifically, the decoder is used for converting a digital signal into a multi-bit thermometer code. The random number generator is used for outputting a reset signal in a random number state; the rest signal has a plurality of bits that are arranged alternatively and randomly, wherein the arrangement mode is changed at different time; and in the reset signal, the number of the bits that are in a logic high level is equal to the number of the bits that are in a logic low level. When the clock signal is in the first state, the conversion module converts the thermometer code into an analog voltage relating to the digital signal; and when the clock signal is in the second state, the conversion module enables the analog voltage to be reduced to zero according to the reset signal. According to the invention, a spurious free dynamic range can be enlarged.
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Description

technical field

[0001] The invention relates to a conversion device, in particular to an N-bit digital-to-analog conversion device. Background technique

[0002] Such as figure 1 As shown, the existing literature "C.-H.Lin and K.Bult, 'A 10-b, 500-MSample / s CMOS DAC in 0.6mm2'IEEE J.Solid-State Circuits, vol.33, no.12 , pp.1948-1958, Dec.1998 "proposed an existing N-bit digital-to-analog conversion device, which is suitable for receiving a binary N-bit digital signal D[k] and a clock signal CK, and clock An analog voltage vo corresponding to the digital signal D[k] is output in each period of the signal CK, and the N-bit digital-to-analog conversion device includes: a decoder 1 and a conversion module 2 .

[0003] When the N-bit segmentation mode is congruent weight, the decoder 1 receives the digital signal D[k], and converts the digital signal D[k] into a 2 N Bit thermometer code (Thermometer code) T.

[0004] Conversion module 2 includes 2 N A converter 21 and a load...

Claims

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