GB1484733A - Squaring and to square rooting electrical circuits - Google Patents
Squaring and to square rooting electrical circuitsInfo
- Publication number
- GB1484733A GB1484733A GB5391374A GB5391374A GB1484733A GB 1484733 A GB1484733 A GB 1484733A GB 5391374 A GB5391374 A GB 5391374A GB 5391374 A GB5391374 A GB 5391374A GB 1484733 A GB1484733 A GB 1484733A
- Authority
- GB
- United Kingdom
- Prior art keywords
- square
- amplifier
- source
- gate
- input
- 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
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
- G06G7/20—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating powers, roots, polynomes, mean square values, standard deviation
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
1484733 Electric analogue calculating FERRANTI Ltd 11 Dec 1975 [13 Dec 1974] 53913/74 Heading G4G An electric analogue circuit for deriving square or square root functions utilizes the fact that the source-drain current of a field effect transistor is proportional to the square of the source drain voltage when the gate is held at the "pinch-off" level. In Fig. 1, which gives an output voltage at 38 related to the square of an input voltage at 40, the gate 14 of F.E.T. 11 is held at the "pinch-off" level by connection to the gate 19 of a further similar F.E.T. 16 in a circuit 15 which maintains a small current through F.E.T. 16. The input at 40 is applied to the drain 13 of F.E.T. 11 through an amplifier 25 and the input inverted by another amplifier 29 is connected to the source 12 of F.E.T. 11. An amplifier 36 whose inputs are connected between the midpoint of the feedback loop of amplifier 29 and the source 12 has a feedback resistor 37 which tends to maintain the inputs of amplifier 36 equal and thus carries a current equal to the source-drain current of F.E.T. 11 and hence proportional to the square of the input signal, thus giving the desired output at 38. A square root circuit using the same principles is illustrated in Fig. 2 (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5391374A GB1484733A (en) | 1975-12-11 | 1975-12-11 | Squaring and to square rooting electrical circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5391374A GB1484733A (en) | 1975-12-11 | 1975-12-11 | Squaring and to square rooting electrical circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1484733A true GB1484733A (en) | 1977-09-01 |
Family
ID=10469389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5391374A Expired GB1484733A (en) | 1975-12-11 | 1975-12-11 | Squaring and to square rooting electrical circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1484733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198675A (en) * | 1978-05-19 | 1980-04-15 | Harris Corporation of Cleveland, Ohio | Linearization technique for closed-loop acousto-optic modulators |
-
1975
- 1975-12-11 GB GB5391374A patent/GB1484733A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4198675A (en) * | 1978-05-19 | 1980-04-15 | Harris Corporation of Cleveland, Ohio | Linearization technique for closed-loop acousto-optic modulators |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |