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Class Information
Number: 326/53
Name: Electronic digital logic circuitry > Exclusive function (e.g., exclusive or, etc.) > Half-adder or quarter-adder
Description: Subject matter comprising a logic circuit which has two input and two output channels for binary signals, and which operates to produce an output signal (i.e., sum) on one of the output channels when one, but not both, of the input signals is present and an output (i.e., carry) on the other output channel when both of the input signals are present.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7242219 |
Circuit for parity tree structure |
Jul. 10, 2007 |
| 7170317 |
Sum bit generation circuit |
Jan. 30, 2007 |
| 6781412 |
Logic circuit for fast carry/borrow |
Aug. 24, 2004 |
| 6700405 |
Logic circuit and full adder using the same |
Mar. 2, 2004 |
| 6127842 |
Modified adder tree structure and method using logic and gates to generate carry-in values |
Oct. 3, 2000 |
| 6043686 |
Apparatus and method for transistor element reduction in circuits comparing serial data signals |
Mar. 28, 2000 |
| 5990703 |
Apparatus and method for a low power latchable adder |
Nov. 23, 1999 |
| 5986464 |
Threshold logic circuit with low space requirement |
Nov. 16, 1999 |
| 5966029 |
Multi-bit exclusive or |
Oct. 12, 1999 |
| 5818255 |
Method and circuit for using a function generator of a programmable logic device to implement carry logic functions |
Oct. 6, 1998 |
| 5748010 |
Logic signal level translation apparatus having very low dropout with respect to the powering rails |
May. 5, 1998 |
| 5635858 |
Zero-stopping incrementers |
Jun. 3, 1997 |
| 5583453 |
Incrementor/decrementor |
Dec. 10, 1996 |
| 5539332 |
Adder circuits and magnitude comparator |
Jul. 23, 1996 |
| 5488315 |
Adder-based base cell for field programmable gate arrays |
Jan. 30, 1996 |
| 5442801 |
Arithmetic and logic unit |
Aug. 15, 1995 |
| 5402012 |
Sequentially clocked domino-logic cells |
Mar. 28, 1995 |
| 5359242 |
Programmable logic with carry-in/carry-out between logic blocks |
Oct. 25, 1994 |
| 5349250 |
Logic structure and circuit for fast carry |
Sep. 20, 1994 |
| 5250860 |
Three-level cascode differential current switch |
Oct. 5, 1993 |
| 5192882 |
Synchronization circuit for parallel processing |
Mar. 9, 1993 |
| 5163020 |
High speed BiCMOS conditional sum adder |
Nov. 10, 1992 |
| 5155388 |
Logic gates with controllable time delay |
Oct. 13, 1992 |
| 4907184 |
Arithmetic operation circuit |
Mar. 6, 1990 |
| 4755696 |
CMOS binary threshold comparator |
Jul. 5, 1988 |
| 4752901 |
Arithmetic logic unit utilizing strobed gates |
Jun. 21, 1988 |
| 4745306 |
Half adder having a pair of precharged stages |
May. 17, 1988 |
| 4713790 |
Exclusive OR/NOR gate having cross-coupled transistors |
Dec. 15, 1987 |
| 4636733 |
Quaternary frequency synthesizer |
Jan. 13, 1987 |
| 4607176 |
Tally cell circuit |
Aug. 19, 1986 |
| 4588903 |
Amorphous semiconductor devices having increased switching speed due to dynamic signal conditioning |
May. 13, 1986 |
| 4541067 |
Combinational logic structure using PASS transistors |
Sep. 10, 1985 |
| 4521810 |
Video source selector |
Jun. 4, 1985 |
| 4503511 |
Computing system with multifunctional arithmetic logic unit in single integrated circuit |
Mar. 5, 1985 |
| 4485316 |
Logic inverter, and a multi-output logic operator derived from this inverter, using at least two low-voltage-threshold field-effect transistors |
Nov. 27, 1984 |
| 4453096 |
MOS Transistor type integrated circuit for the execution of logical operations on a plurality of data signals |
Jun. 5, 1984 |
| 4443768 |
Amplitude- and rise-time-compensated filters |
Apr. 17, 1984 |
| 4363107 |
Binary multiplication cell circuit |
Dec. 7, 1982 |
| 4288751 |
Wave translating circuit |
Sep. 8, 1981 |
| 4240034 |
Digital frequency synthesizer |
Dec. 16, 1980 |
| 4233524 |
Multi-function logic circuit |
Nov. 11, 1980 |
| 4225934 |
Multifunctional arithmetic and logic unit in semiconductor integrated circuit |
Sep. 30, 1980 |
| 4218747 |
Arithmetic and logic unit using basic cells |
Aug. 19, 1980 |
| 4160919 |
Exclusive-OR circuit |
Jul. 10, 1979 |
| 4124899 |
Programmable array logic circuit |
Nov. 7, 1978 |
| 4054788 |
Modular binary half-adder |
Oct. 18, 1977 |
| 4035599 |
Control system for non-resonant microwave dryers |
Jul. 12, 1977 |
| 4024416 |
Method for controlling frequency of electrical oscillations and frequency standard for electronic timepiece |
May. 17, 1977 |
| 4021680 |
Semiconductor device |
May. 3, 1977 |
| 3956640 |
Buffer amplifier for ripple-carry binary generator |
May. 11, 1976 |
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