GB972843A - Improvements in or relating to electric logical circuits - Google Patents
Improvements in or relating to electric logical circuitsInfo
- Publication number
- GB972843A GB972843A GB3891161A GB3891161A GB972843A GB 972843 A GB972843 A GB 972843A GB 3891161 A GB3891161 A GB 3891161A GB 3891161 A GB3891161 A GB 3891161A GB 972843 A GB972843 A GB 972843A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- diodes
- relating
- potential
- logical circuits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
- G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
- G06F7/50—Adding; Subtracting
- G06F7/501—Half or full adders, i.e. basic adder cells for one denomination
- G06F7/502—Half adders; Full adders consisting of two cascaded half adders
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Computing Systems (AREA)
- Mathematical Optimization (AREA)
- General Engineering & Computer Science (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Noise Elimination (AREA)
- Amplifiers (AREA)
Abstract
972, 843. Electronic binary half adders. MULLARD Ltd. Aug. 14, 1962 [Oct. 31, 1961; Dec.11, 1961],Nos.38911/61 and 44234/61. Heading G4A. [Also in Division H3] The "exclusive OR" circuit of Specification 887,933, is modified by the addition of a pair of catching diodes D1, D2 as described in Specification 970,549 and is combined with an AND circuit to form a half adder of the type described in Specification 895,909. The catching diodes permit faster operation and also provide additional current paths in parallel with the AND circuit T3, T4 so that the carry output may be reduced from two units to a more convenient value, adjustment of the value being made by means of resistors R5, R6. The D.C. potential to which the diodes are connected may be either a potential + V d as shown, Fig. 2, or may be earthed, Fig. 1 (not shown).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE623191D BE623191A (en) | 1961-10-04 | ||
GB3575861A GB970549A (en) | 1961-10-04 | 1961-10-04 | Improvements in or relating to electric logical circuits |
DEN22156A DE1170465B (en) | 1961-10-04 | 1962-09-29 | íÀExclusive-Oderí gate with two inputs and its use in a half adder |
CH1152862A CH410055A (en) | 1961-10-04 | 1962-10-01 | Exclusive-or-gate |
FR911193A FR1335752A (en) | 1961-10-04 | 1962-10-03 | Gate <or exclusive> and half-adder equipped with such a gate |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3575861A GB970549A (en) | 1961-10-04 | 1961-10-04 | Improvements in or relating to electric logical circuits |
GB4423361 | 1961-12-11 | ||
GB4423461 | 1962-08-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB972843A true GB972843A (en) | 1964-10-21 |
Family
ID=27259309
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3891161A Expired GB972843A (en) | 1961-10-04 | 1961-10-31 | Improvements in or relating to electric logical circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB972843A (en) |
-
1961
- 1961-10-31 GB GB3891161A patent/GB972843A/en not_active Expired
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