US3626216A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shifting circuit
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1969-04-14
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Granted: 1971-12-07
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Expires: 1989-04-14
Abstract
Abstract From the collector and the emitter respectively of a transistor amplifier, signals with a phase difference of 180* are obtained. Upon increasing frequency the phase difference decreases due to the frequency dependence of the parameters of the transistor. By connecting the respective windings of a transformer between ground potential and the collector and the emitter respectively of a transistor amplifier, output signals with a phase difference of 180* over a wide frequency range will be obtained.
Inventors
- 👤 Tage Ake Siverth Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:59
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/22; H03H11/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A phase-splitting amplifier for high-frequency signals comprising a transistor having base, emitter and collector electrodes, a direct voltage source having first and second terminals, the base of said transistor being adapted to receive the high-frequency signals, first resistance means for connecting said emitter electrode to said first terminal, second resistance means for connecting said collector electrode to said second terminal, a transformer having first and second windings, each of said windings having first and second ends, means for connecting the first ends of each of said windings to a constant DC potential, means for connecting the second end of said first winding to said collector electrode, and means for connecting the second end of said second winding to said emitter electrode, whereby the signals at said second ends of said windings generated in response to signals received by said base electrode have a phase difference of substantially 180 electrical degrees.
Claim 2
Dependent Claim
150 words
A phase-splitting amplifier for high-frequency signals comprising a transistor having base, emitter and collector electrodes, a direct voltage source having first and second terminals, the base of said transistor being adapted to receive the high-frequency signals, first resistance means for connecting said emitter electrode to said first terminal, second resistance means for connecting said collector electrode to said second terminal, a transformer having first and second windings, each of said windings having first and second ends, means for connecting the first ends of each of said windings to a constant DC potential, means for connecting the second end of said first winding to said collector electrode, and means for connecting the second end of said second winding to said emitter electrode, whereby the signals at said second ends of said windings generated in response to signals received by said base electrode have a phase difference of substantially 180 electrical degrees.
References Cited (Backward Citations)
US3154750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |