JPH0243028U

JPH0243028U -

Info

Publication number: JPH0243028U
Application number: JP12089088U
Authority: JP
Priority date: 1988-09-14
Filing date: 1988-09-14
Publication date: 1990-03-26

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示す概観図、第
２図ａは従来のデイジタル−アナログ変換装置の
入出力特性図、第２図ｂは本考案のデイジタル−
アナログ変換装置の入出力特性図、第３図ａは入
力Ｍｂｉｔデイジタル信号のフオーマツト図、第
３図ｂは入力Ｍｂｉｔデイジタル信号が＋｜２（
Ｎ−１）−１｜時の上位Ｎｂｉｔのフオーマツト
図、第３図ｃは下位Ｎｂｉｔのフオーマツト図、
第３図ｄは入力Ｍｂｉｔデイジタル信号が−｜２
（Ｎ−１）｜時の上位Ｎｂｉｔのフオーマツト図
、第３図ｅは下位Ｎｂｉｔのフオーマツト図、第
４図は従来のデイジタル−アナログ変換装置の概
観図である。図において、１はＮｂｉｔＤ／Ａコンバータ、
２，７は基準電源、３は入力Ｍｂｉｔデイジタル
信号、４は出力アナログ信号、５は乗算器、６は
スイツチ、８はアナログスイツチ、９は判定器で
ある。なお、各図中同一符号は同一または相当部
分を示す。 FIG. 1 is an overview diagram showing an embodiment of this invention, FIG. 2a is an input/output characteristic diagram of a conventional digital-to-analog converter, and FIG.
The input/output characteristic diagram of the analog converter is shown in FIG. 3a, the format diagram of the input Mbit digital signal, and FIG.
N-1)-1|, the format diagram of the upper N bits, FIG. 3c is the format diagram of the lower N bits,
Figure 3d shows that the input Mbit digital signal is -|2
(N-1)| FIG. 3e is a format diagram of the upper N bits, FIG. 3 is a format diagram of the lower N bits, and FIG. 4 is an overview diagram of a conventional digital-to-analog converter. In the figure, 1 is an Nbit D/A converter,
2 and 7 are reference power supplies, 3 is an input Mbit digital signal, 4 is an output analog signal, 5 is a multiplier, 6 is a switch, 8 is an analog switch, and 9 is a determiner. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

One input Mbit digital signal is converted into 2 (M-
N) a multiplier that multiplies, a switch that switches between the output signal of this multiplier and the input Mbit digital signal, an Nbit D/A converter that converts the output signal of this switch to D/A and generates an output analog signal, and this Nbit D/A converter. A reference power supply that generates a reference power supply voltage of 1/2 of this reference power supply.
A reference power supply that generates (M-N) times the voltage, and switches the output voltage of the two reference power supplies above to the Nbi
A digital-to-analog converter comprising: an analog switch used as a reference power source for a tD/A converter; and a determiner that determines the magnitude of the input Mbit digital signal and controls contacts of the switch and the analog switch.