JPS643222U

JPS643222U -

Info

Publication number: JPS643222U
Application number: JP9351787U
Authority: JP
Priority date: 1987-06-18
Filing date: 1987-06-18
Publication date: 1989-01-10

Description

[Brief explanation of drawings]

第１図は、本考案の一実施例を示す回路図、第
２図及び第３図は従来のＡ／Ｄ変換回路を示す回
路図、第４図イ及びロは第１図Ａ／Ｄ変換回路か
ら得られる出力デジタル信号を示す図である。１４ａ〜１４ｐ……抵抗、１６ａ〜１６ｃ……
比較回路、１８，１９ａ〜１９ｄ……スイツチ群
、２０……エンコーダ、２１，２２……レジスタ
、２３……選択回路。 Fig. 1 is a circuit diagram showing an embodiment of the present invention, Figs. 2 and 3 are circuit diagrams showing conventional A/D conversion circuits, and Fig. 4 A and B are Fig. 1 A/D conversion circuits. FIG. 2 is a diagram showing an output digital signal obtained from the circuit. 14a to 14p...Resistance, 16a to 16c...
Comparison circuit, 18, 19a to 19d... switch group, 20... encoder, 21, 22... register, 23... selection circuit.

Claims

[Scope of utility model registration request]

A plurality of resistors connected in series between a reference power source and ground, a plurality of comparison circuits that compare the analog input signal and the reference voltage, and a voltage obtained at a connection point of the plurality of resistors as a first reference voltage. A first switch group for the upper bits is applied to the comparison circuit, and a second to Nth switch group for the lower bits is applied to the comparison circuit with the voltage obtained at another connection point of the plurality of resistors as a second reference voltage. a group of switches, an encoder that encodes the output signal of the comparison circuit, first and second registers that store the output signals of the encoder, and the first to second registers according to the output signals of the first and second registers. a selection circuit for selectively driving one of the N switch groups;
A characterized in that an upper bit digital signal is generated at the output terminal of the register, and a lower bit digital signal is generated at the output terminal of the second register.
/D conversion circuit.