US3766406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ecl-to-ttl converter
Assignee: Cogar Corp
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Filing: 1971-12-06
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Granted: 1973-10-16
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Expires: 1991-12-06
Abstract
Abstract An ECL-to-TTL converter having an ECL input stage for deriving a signal to drive a TTL output stage. The TTL output stage includes a pair of transistors arranged in a push-pull configuration for maximum speed of operation.
Inventors
- 👤 R Bryant
- 👤 G Tu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:36
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/0175; H03K19/018; H03K19/01806; H03K19/01812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
386 words
An ECL-to-TTL converter comprising an ECL current switch having an input terminal and an output terminal, said ECL current switch comprising a pair of transistors with the emitters of said pair of transistors connected together and the base of one of said pair of transistors being said input terminal, said ECL current switch further comprising a resistor electrically connected to the emitters of said pair of transistors, clamping means comprising a third transistor and a pair of voltage divider resistors connected to the base of said third transistor for clamping the collector of the other of said pair of transistors, a fourth transistor, said base of said fourth transistor being connected to the collector of said other of said pair of transistors, said fourth transistor being an emitter follower of said other transistor of said pair of transistors, a pair of diodes connected in series to the emitter of said fourth transistor, the cathode of one of said pair of diodes being connected to two parallel paths, one of said two parallel paths having a resistor, a diode and a resistor connected in series to said cathode, the other of said two parallel paths have three resistors connected in series, one of said two parallel paths extends the potential at said cathode to the base of a fifth transistor, the other of said two parallel paths extends the potential at said cathode to the base of a seventh transistor, said ECL-to-TTL converter having an output stage comprising a pair of transistors, said seventh transistor comprising one of said pair of transistors and a sixth transistor comprising the other of said pair of transistors, the emitter of said sixth transistor being connected to the collector of said seventh transistor, the junction of said emitter of said sixth transistor and the collector of said seventh transistor being the output terminal of said ECL-to-TTL converter, a diode associated with said seventh transistor connected from between the junction of said emitter of said sixth transistor and the collector of said seventh transistor to between two of said three resistors of said other of said two parallel paths, a diode associated with said fifth transistor connected between the collector of said fifth transistor to the junction between the first resistor and said diode of said one of said two parallel paths.
Claim 2
Dependent Claim
386 words
An ECL-to-TTL converter comprising an ECL current switch having an input terminal and an output terminal, said ECL current switch comprising a pair of transistors with the emitters of said pair of transistors connected together and the base of one of said pair of transistors being said input terminal, said ECL current switch further comprising a resistor electrically connected to the emitters of said pair of transistors, clamping means comprising a third transistor and a pair of voltage divider resistors connected to the base of said third transistor for clamping the collector of the other of said pair of transistors, a fourth transistor, said base of said fourth transistor being connected to the collector of said other of said pair of transistors, said fourth transistor being an emitter follower of said other transistor of said pair of transistors, a pair of diodes connected in series to the emitter of said fourth transistor, the cathode of one of said pair of diodes being connected to two parallel paths, one of said two parallel paths having a resistor, a diode and a resistor connected in series to said cathode, the other of said two parallel paths have three resistors connected in series, one of said two parallel paths extends the potential at said cathode to the base of a fifth transistor, the other of said two parallel paths extends the potential at said cathode to the base of a seventh transistor, said ECL-to-TTL converter having an output stage comprising a pair of transistors, said seventh transistor comprising one of said pair of transistors and a sixth transistor comprising the other of said pair of transistors, the emitter of said sixth transistor being connected to the collector of said seventh transistor, the junction of said emitter of said sixth transistor and the collector of said seventh transistor being the output terminal of said ECL-to-TTL converter, a diode associated with said seventh transistor connected from between the junction of said emitter of said sixth transistor and the collector of said seventh transistor to between two of said three resistors of said other of said two parallel paths, a diode associated with said fifth transistor connected between the collector of said fifth transistor to the junction between the first resistor and said diode of said one of said two parallel paths.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |