JPS5518706A - Parallel adder circuit - Google Patents
Parallel adder circuitInfo
- Publication number
- JPS5518706A JPS5518706A JP8947378A JP8947378A JPS5518706A JP S5518706 A JPS5518706 A JP S5518706A JP 8947378 A JP8947378 A JP 8947378A JP 8947378 A JP8947378 A JP 8947378A JP S5518706 A JPS5518706 A JP S5518706A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transfer elements
- signal transfer
- carry
- half adders
- 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.)
- Pending
Links
Abstract
PURPOSE: To reduce greatly the total number of elements without changing an adding speed by using signal transfer elements, whose switching operation are controlled by outputs of half adders for respective digits, as carry transfer elements and then by connecting all of them in series.
CONSTITUTION: For respective digits, logical gates 1a to 1d and half adders 2a to 2d are provided, and signal transfer elements 11a to 11d controlled by the half adders are connected in series. Further, carry-signal generating tansistors 12a to 12d and 15a to 15d are connected between respective signal transfer elements for corresponding digits and post-stage signal transfer elements. In addition, signal transfer circuit 16 which operates where there is no carry signal from the prior digit of the lowest digit and circuit 17 which operates when there is the signal are provided. The output of an addition result is outputted from OR-ELSE gate 19d to 19a in the former case and from gate 20a to 20d in the latter case. Therefore, the adding speed will not be reduced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8947378A JPS5518706A (en) | 1978-07-24 | 1978-07-24 | Parallel adder circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8947378A JPS5518706A (en) | 1978-07-24 | 1978-07-24 | Parallel adder circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5518706A true JPS5518706A (en) | 1980-02-09 |
Family
ID=13971686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8947378A Pending JPS5518706A (en) | 1978-07-24 | 1978-07-24 | Parallel adder circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5518706A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5752945A (en) * | 1980-08-04 | 1982-03-29 | Western Electric Co | Carry circuit |
JPH02301827A (en) * | 1989-04-28 | 1990-12-13 | Internatl Business Mach Corp <Ibm> | Logic synthesization network |
JPH08251008A (en) * | 1996-03-15 | 1996-09-27 | Hitachi Ltd | Hybrid logic circuit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52140241A (en) * | 1976-05-18 | 1977-11-22 | Nippon Telegr & Teleph Corp <Ntt> | Binary #-digit addition circuit |
JPS52152132A (en) * | 1976-06-14 | 1977-12-17 | Matsushita Electric Ind Co Ltd | Carry siganl generator circuit |
-
1978
- 1978-07-24 JP JP8947378A patent/JPS5518706A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52140241A (en) * | 1976-05-18 | 1977-11-22 | Nippon Telegr & Teleph Corp <Ntt> | Binary #-digit addition circuit |
JPS52152132A (en) * | 1976-06-14 | 1977-12-17 | Matsushita Electric Ind Co Ltd | Carry siganl generator circuit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5752945A (en) * | 1980-08-04 | 1982-03-29 | Western Electric Co | Carry circuit |
JPH0221013B2 (en) * | 1980-08-04 | 1990-05-11 | Ei Teii Ando Teii Tekunorojiizu Inc | |
JPH02301827A (en) * | 1989-04-28 | 1990-12-13 | Internatl Business Mach Corp <Ibm> | Logic synthesization network |
JPH08251008A (en) * | 1996-03-15 | 1996-09-27 | Hitachi Ltd | Hybrid logic circuit |
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