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Thermometer decoder

A decoder and thermometer technology, applied in the field of digital circuits, can solve problems such as large circuit area and complex structure of thermometer decoders, and achieve the effects of simple circuit structure, fast signal transmission speed, and improved decoding speed

Active Publication Date: 2015-11-25
SEMICON MFG INT (SHANGHAI) CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The present invention solves the problems of complex structure and large circuit area of ​​existing thermometer decoders

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Embodiment Construction

[0034] As described in the background art, if a thermometer decoder for multi-bit binary data is designed according to the logical expression of each bit of output data of the thermometer decoder, the obtained circuit structure is complex and occupies a large area. The invention provides a thermometer decoder, adopting a hierarchical design, which can simplify the circuit structure of the thermometer decoder and save the circuit area.

[0035] The thermometer decoder provided by the present invention includes a first sub-decoding unit, a second sub-decoding unit and 2N-M control modules, N is the number of bits of binary data to be decoded, 2≤M≤(N-2), and M is a positive integer. The least significant bit data of the binary data to be decoded is the first bit data of the binary data to be decoded, and the most significant bit data of the binary data to be decoded is the Nth bit of the binary data to be decoded data.

[0036] The first sub-decoding unit is adapted to decode th...

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Abstract

A thermometer decoder comprises a first decoding subunit, a second decoding subunit and 2 (N-M) control modules. The first decoding subunit is suitably used for decoding data within a range from least significant bit data to Mth data among binary data to be decoded into 2M-bit binary data. The second decoding subunit is suitably used for decoding data within a range from the (M+1)th data to the most significant bit data among the binary data to be decoded into 2(N-M)-bit binary data. Each control module comprises 2M control units. The thermometer decoder provided in the invention has characteristics of simple circuit structure, small circuit area and great decoding speed.

Description

technical field [0001] The invention relates to the technical field of digital circuits, in particular to a thermometer decoder. Background technique [0002] In digital systems, it is often necessary to convert one code to another to meet specific needs. The circuit that completes this function is called a code conversion circuit. The code conversion circuit includes an encoder and a decoder, wherein the decoder is a code conversion circuit that converts a binary code with a specific meaning into a corresponding output signal. As a kind of decoder, thermometer decoder is widely used in memory repair design and digital-to-analog converter. [0003] Table 1 is a truth table of an existing 3-wire thermometer decoder. The 3-wire thermometer decoder is suitable for converting the input three-bit binary data A 2 A 1 A 0 Decoded into 8-bit binary data Y 7 Y 6 Y 5 Y 4 Y 3 Y 2 Y 1 Y 0 output. [0004] Table I [0005] input output A 2 A 1 A 0 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/04
Inventor 李智
Owner SEMICON MFG INT (SHANGHAI) CORP
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