GB1432199A - Circuit arrangements comprising a switching transistor - Google Patents
Circuit arrangements comprising a switching transistorInfo
- Publication number
- GB1432199A GB1432199A GB5837973A GB5837973A GB1432199A GB 1432199 A GB1432199 A GB 1432199A GB 5837973 A GB5837973 A GB 5837973A GB 5837973 A GB5837973 A GB 5837973A GB 1432199 A GB1432199 A GB 1432199A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base
- transistor
- switching
- temperature
- current
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/041—Modifications for accelerating switching without feedback from the output circuit to the control circuit
- H03K17/0412—Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the control circuit
- H03K17/04126—Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the control circuit in bipolar transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
Landscapes
- Amplifiers (AREA)
- Electronic Switches (AREA)
- Dc-Dc Converters (AREA)
Abstract
1432199 Transistor switching circuits PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 17 Dec 1973 [20 Dec 1972 13 Aug 1973] 58379/73 Heading H3T A switching circuit has a switching signal 5 supplied to the base of a switching transistor TR1 via an amplifier TR2 having a current sensing impedance R connected between the amplifier output and the base of the switching transistor TR1 and the amplifier TR2 is included within a negative feedback loop in which a feedback signal is derived from the collector of a feedback transistor TR3 the base-emitter of which is so connected across the current sensing impedance R that the base current of the switching transistor TR1 forward biases the base-emitter junction of the feedback transistor TR3. The negative feedback loop is operative such that when the temperature of the circuit is increased from a low temperature (50‹ C. below a nominal temperature) to a nominal temperature the base drive current to TR1 is reduced, in view of the higher current gain of the transistor TR1 at the nominal temperature as compared to that at the lower temperature, but is sufficient to ensure saturation of the transistor TR1 with a power dissipation less than that occurring in a known circuit (Fig. 1, not shown) where excessive power dissipation at high temperatures is most troublesome particularly if the circuit arrangement forms part of an integrated circuit assembly. The reduction of base drive current as the temperature increases occurs due to reduction in the base-emitter junction voltage of the transistor TR3 to which the voltage drop across the resistance R is matched by the feedback arrangement. Due to this matching the current applied to the base of TR1 is largely independent of supply voltage variations or variations in the signal source magnitude 5. A bleeder resistor may be connected to the base electrode of the switching transistor TR1 to accommodate reverse base currents whilst switching from the conductive to the non-conductive state.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPB169072 | 1972-12-20 | ||
| AU59174/73A AU468524B2 (en) | 1972-12-20 | 1972-12-20 | Improved circuit arrangements comprising a switching transistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1432199A true GB1432199A (en) | 1976-04-14 |
Family
ID=25632267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5837973A Expired GB1432199A (en) | 1972-12-20 | 1973-12-17 | Circuit arrangements comprising a switching transistor |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS4998162A (en) |
| DE (1) | DE2360024A1 (en) |
| FR (1) | FR2211818B1 (en) |
| GB (1) | GB1432199A (en) |
| IT (1) | IT1000522B (en) |
| NL (1) | NL7317142A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2204445A (en) * | 1987-03-06 | 1988-11-09 | Texas Instruments Ltd | Semiconductor switch |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2447628A1 (en) * | 1979-01-24 | 1980-08-22 | Materiel Telephonique | Overload protection circuit for electronic switch - has switch in series with PTC resistor and controlled via low-voltage |
| FR2519211A1 (en) * | 1981-12-30 | 1983-07-01 | Radiotechnique Compelec | OUTPUT STAGE FOR INTEGRATED CIRCUIT WITH DOOR NETWORK OF ECL TECHNIQUE REGULATED WITH RESPECT TO VARIATIONS ASSOCIATED WITH OPERATING TEMPERATURES |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6705024A (en) * | 1967-04-08 | 1968-10-09 | ||
| US3611172A (en) * | 1969-11-24 | 1971-10-05 | Avco Corp | Temperature-compensating shunt for solid-state devices |
-
1973
- 1973-12-01 DE DE19732360024 patent/DE2360024A1/en active Pending
- 1973-12-14 NL NL7317142A patent/NL7317142A/xx unknown
- 1973-12-17 JP JP48139738A patent/JPS4998162A/ja active Pending
- 1973-12-17 GB GB5837973A patent/GB1432199A/en not_active Expired
- 1973-12-17 IT IT7072873A patent/IT1000522B/en active
- 1973-12-20 FR FR7345680A patent/FR2211818B1/fr not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2204445A (en) * | 1987-03-06 | 1988-11-09 | Texas Instruments Ltd | Semiconductor switch |
| US4977476A (en) * | 1987-03-06 | 1990-12-11 | Texas Instruments Incorporated | Semiconductor switch |
| GB2204445B (en) * | 1987-03-06 | 1991-04-24 | Texas Instruments Ltd | Semiconductor switch |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7317142A (en) | 1974-06-24 |
| DE2360024A1 (en) | 1974-07-04 |
| IT1000522B (en) | 1976-04-10 |
| FR2211818A1 (en) | 1974-07-19 |
| FR2211818B1 (en) | 1976-11-19 |
| JPS4998162A (en) | 1974-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |