Patent US4216443A successfully refreshed from Google Patents.
US4216443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor resonant circuit power oscillators
Assignee: UNITRON CORP
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Filing: 1979-02-02
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Granted: 1980-08-05
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Expires: 1999-02-02
Abstract
Abstract A power oscillator utilizing one or more field effect transistors in conjunction with a tank circuit.
Inventors
- 👤 Andrew Zaderej
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:14
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/02; H03B7/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
A power oscillator comprising a junction field effect transistor of the N-channel type, a bi-pole transistor of the PNP type, tank circuit means for producing a resonant frequency, and bi-pole transistor having its emitter connected to the drain of said field effect transistor and its collector connected to said tank circuit means, said field effect transistor having its gate connected to the collector of said bi-pole transistor, said bi-pole transistor having its base functionally connected to the source of said field effect transistor, diode means for biasing said bi-pole transistor base, said tank circuit means adapted for connection to a power source at its negative part, the source of said field effect transistor adapted for connection to the positive part of said power source, said bi-pole transistor and field effect transistor producing in combination a negative resistance effect with lambda-shaped current-voltage output characteristic, said diode means including a zener diode and resistor in parallel, means for connecting said zener diode and resistor to said power source independently of said field effect transistor and bi-pole transistor, the base of said bi-pole transistor being connected to said resistor.
Claim 2
Dependent Claim
186 words
A power oscillator comprising a junction field effect transistor of the N-channel type, a bi-pole transistor of the PNP type, tank circuit means for producing a resonant frequency, and bi-pole transistor having its emitter connected to the drain of said field effect transistor and its collector connected to said tank circuit means, said field effect transistor having its gate connected to the collector of said bi-pole transistor, said bi-pole transistor having its base functionally connected to the source of said field effect transistor, diode means for biasing said bi-pole transistor base, said tank circuit means adapted for connection to a power source at its negative part, the source of said field effect transistor adapted for connection to the positive part of said power source, said bi-pole transistor and field effect transistor producing in combination a negative resistance effect with lambda-shaped current-voltage output characteristic, said diode means including a zener diode and resistor in parallel, means for connecting said zener diode and resistor to said power source independently of said field effect transistor and bi-pole transistor, the base of said bi-pole transistor being connected to said resistor.
Claim 3
Dependent Claim
170 words
A power oscillator comprising a junction field effect transistor, means complementally coupled to said field effect transistor for producing in association with the transistor a negative resistance effect with lambda-shaped current-voltage output characteristic, tank circuit means for producing a resonant frequency, said tank circuit means being connected in series with said field effect transistor, said tank circuit means including means for connection to the positive part of a power source, said field effect transistor including means for connection to the negative part of said power source, said coupled means being an NPN bi-pole transistor and said field effect transistor being a P-channel type, the emmitter of said NPN transistor being connected to the drain of said P-channel transistor, the collector of said NPN transistor being connected to the gate of said P-channel transistor, a zener diode and resistor in parallel, means connecting said zener diode and resistor to a power source independently of said P-channel transistor and NPN transistor, the base of said NPN transistor being connected to said resistor.
Claim 4
Dependent Claim
170 words
A power oscillator comprising a junction field effect transistor, means complementally coupled to said field effect transistor for producing in association with the transistor a negative resistance effect with lambda-shaped current-voltage output characteristic, tank circuit means for producing a resonant frequency, said tank circuit means being connected in series with said field effect transistor, said tank circuit means including means for connection to the positive part of a power source, said field effect transistor including means for connection to the negative part of said power source, said coupled means being an NPN bi-pole transistor and said field effect transistor being a P-channel type, the emmitter of said NPN transistor being connected to the drain of said P-channel transistor, the collector of said NPN transistor being connected to the gate of said P-channel transistor, a zener diode and resistor in parallel, means connecting said zener diode and resistor to a power source independently of said P-channel transistor and NPN transistor, the base of said NPN transistor being connected to said resistor.
References Cited (Backward Citations)
US3130378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |