Logic circuit utilizing capacitive coupling, an AD converter and

Details Logic circuit utilizing capacitive coupling, an AD converter and Logic circuit utilizing capacitive coupling, an AD converter and

1997-07-07

2000-03-28

Tokar, Michael

Electronic digital logic circuitry

Threshold

With field-effect transistor

326 11, 326112, H03K 1923, H03K 1920

Patent

active

060436751

ABSTRACT:
According to the present invention, various logic circuits, AD converters, DA converters and counter circuits can be constituted with a small number of transistors by employing a capacitive coupling circuit. An analog/digital converter comprises: an input terminal, for which analog input is provided; an output terminal of N (N is a plural number) bits, for which binary output is provided; and N unit circuits arranged in parallel, each including an input capacitor having one electrode connected to the input terminal, a first inverter connected to the other electrode of the input capacitor, and a second inverter connected to the first inverter, wherein outputs of the second inverters of the unit circuits are respectively provided for the output terminals, wherein inverted outputs of the outputs for the unit circuits are fed back via feedback capacitors to respective input terminals of the first inverters of the unit circuits corresponding to lower bits, and wherein a capacitance of the feedback capacitor, which corresponds to the inverted output of the M-th (M is an integer) unit circuit from the most significant bit, is 1/2.sup.M times a capacitance of the input capacitor of the unit circuit that is fed back.

REFERENCES:
patent: 3260863 (1966-07-01), Burns et al.
patent: 5258657 (1993-11-01), Shibata et al.
patent: 5444411 (1995-08-01), Yang et al.
patent: 5594372 (1997-01-01), Shibata et al.
patent: 5644253 (1997-07-01), Takatsu
patent: 5818380 (1998-10-01), Ito et al.

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