GB1315046A - Signal selection circuit - Google Patents
Signal selection circuitInfo
- Publication number
- GB1315046A GB1315046A GB5962870A GB5962870A GB1315046A GB 1315046 A GB1315046 A GB 1315046A GB 5962870 A GB5962870 A GB 5962870A GB 5962870 A GB5962870 A GB 5962870A GB 1315046 A GB1315046 A GB 1315046A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- output
- circuit
- signal
- transistors
- 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
- G06G7/25—Arrangements for performing computing operations, e.g. operational amplifiers for discontinuous functions, e.g. backlash, dead zone, limiting absolute value or peak value
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)
- Measurement Of Current Or Voltage (AREA)
- Character Input (AREA)
- Image Input (AREA)
Abstract
1315046 Selecting and indicating largest or smallest signals; amplifiers INTERNATIONAL BUSINESS MACHINES CORP 16 Dec 1970 [29 Dec 1969 (2)] 59628/70 Heading H3T In a circuit for selecting the largest or smallest of a number of input signals V1-Vn in which an amplifier for each signal has negative feedback path F from a common output whereby all but the extreme signal is suppressed, means are provided to indicate digitally at J which amplifier carries the extreme signal. As shown in Fig. 7, an individual feedback diode T limits the effect of the overall feedback to each input. In Figs. 6 and 8 (not shown) the indication is provided by a respective long tail pair which detects the voltage across a diode 5 connected in series with each amplifier output. In Figs. 4 and 5 (not shown) transistors (Q15 or Q9<SP>1</SP>) detect the emitter-base voltage of the output transistor (Q14 or Q11<SP>1</SP>) and in Figs. 2 or 3 (not shown), transistors (Q10 or Q12) connected to the collectors of the output emitter followers (Q9 or Q11) detect which emitter follower is conducting. Figs. 2-5 and 8 show operational amplifiers suitable for use in the selecting circuit and which provide an indication if the amplifier is cut off by the common feedback as described above. The amplifiers have erect and inverting inputs B, H (Fig. 2) to Darlington type emitter coupled pairs Q1, Q3 and Q2, Q4 diodes being provided to stabilize the operation. The analogue output is provided in Fig. 2 by transistors Q8 and Q9, the amplifier being suitable for use in a minimum level selector. In Fig. 3 (not shown) the analogue signal output transistor is of the opposite conductivity type and the circuit is suitable for a maximum signal selector. Figs. 4 and 5 (not shown) use a different cut-off indicating circuit. Fig. 8 is a similar integrated circuit amplifier but incorporating a cut-off indicator Z8, Z9 including a diode 120 for limiting the swing by limiting the difference in collector potentials.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US88858069A | 1969-12-29 | 1969-12-29 | |
| US88858169A | 1969-12-29 | 1969-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1315046A true GB1315046A (en) | 1973-04-26 |
Family
ID=27128887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5962870A Expired GB1315046A (en) | 1969-12-29 | 1970-12-16 | Signal selection circuit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS4917051B1 (en) |
| DE (1) | DE2055939A1 (en) |
| GB (1) | GB1315046A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2227325A (en) * | 1989-01-21 | 1990-07-25 | Ferranti Int Signal | Maximum amplitude detector |
-
1970
- 1970-11-11 JP JP45098827A patent/JPS4917051B1/ja active Pending
- 1970-11-13 DE DE19702055939 patent/DE2055939A1/en active Pending
- 1970-12-16 GB GB5962870A patent/GB1315046A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2227325A (en) * | 1989-01-21 | 1990-07-25 | Ferranti Int Signal | Maximum amplitude detector |
| US5047667A (en) * | 1989-01-21 | 1991-09-10 | Gec Ferranti Defence Systems Limited | Voltage difference detector |
| GB2227325B (en) * | 1989-01-21 | 1993-06-09 | Ferranti Int Signal | Electrical detector circuits |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2055939A1 (en) | 1971-07-01 |
| JPS4917051B1 (en) | 1974-04-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |