US3569850A
Expired / Lapsed
US
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High frequency amplifier with line circuits
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1966-10-11
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Granted: 1971-03-09
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Expires: 1986-10-11
Abstract
Abstract A high frequency amplifier has a line circuit which is resonant at some selected frequency, and which line circuit includes a variable capacitive diode means arranged to tune the line circuit, and a series resonant circuit which includes the said diode means and has a resonant frequency different from said resonant line circuit. The said series circuit includes an inductive means connected in series with said diode means.
Inventors
- 👤 Rolf Wegener
- 👤 Werner Backnick
- 👤 Werner Heitefuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:39
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0658; H03D9/0666; H03J; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
228 words
In a high frequency amplifier having a plurality of interconnected stages having line circuits, including inner and outer conductors, resonant at one or more selected frequencies, the improvement wherein at least some of said resonant line circuits further include: variable capacitive diode means connected in said line circuit for tuning the resonant line circuit, said diode means having a self-inductance and being adapted to have its capacitance varied by a voltage applied thereto, said diode means being connected between ground and one end of the inner conductor of the line circuit, the other end of which is coupled to an electrode of the active element of the respective stage of said amplifier; a coil connected in series with said diode means and the inner conductor of said line circuit so that the inductance of said coil and the self-inductance of said diode means forms a series resonant circuit with the capacitance of said diode means; the inductance of said coil and the capacitance of said diode means being such that the resonant frequency of said series resonant circuit differs from that of said resonant line circuit for a given capacitive value of said diode means; and means for applying a voltage to said diode means to vary the capacitance thereof and thus simultaneously vary the resonant frequency of both said series resonant circuit and said resonant line circuit.
Claim 2
Dependent Claim
228 words
In a high frequency amplifier having a plurality of interconnected stages having line circuits, including inner and outer conductors, resonant at one or more selected frequencies, the improvement wherein at least some of said resonant line circuits further include: variable capacitive diode means connected in said line circuit for tuning the resonant line circuit, said diode means having a self-inductance and being adapted to have its capacitance varied by a voltage applied thereto, said diode means being connected between ground and one end of the inner conductor of the line circuit, the other end of which is coupled to an electrode of the active element of the respective stage of said amplifier; a coil connected in series with said diode means and the inner conductor of said line circuit so that the inductance of said coil and the self-inductance of said diode means forms a series resonant circuit with the capacitance of said diode means; the inductance of said coil and the capacitance of said diode means being such that the resonant frequency of said series resonant circuit differs from that of said resonant line circuit for a given capacitive value of said diode means; and means for applying a voltage to said diode means to vary the capacitance thereof and thus simultaneously vary the resonant frequency of both said series resonant circuit and said resonant line circuit.
Claim 3
Dependent Claim
28 words
A high frequency amplifier as defined in claiM 12 wherein said series resonant circuit is resonant at a frequency just above the resonant frequency of said line circuit.
Claim 4
Dependent Claim
34 words
A high frequency amplifier as defined in claim 1 wherein a second coil is connected in parallel with said capacitive diode means whereby the frequency range of said resonant line circuit is further increased.
Claim 5
Dependent Claim
63 words
A high frequency amplifier as defined in claim 1 wherein a choke coil is connected to the input electrode of said active element of said amplifier stage, the impedance of said choke coil cooperating with the impedance of said series resonant circuit and having such a value of inductance so as to form a short circuit to ground for undesired parallel resonant frequencies.
Claim 6
Dependent Claim
50 words
A high frequency amplifier as defined in claim 1, wherein said resonant line circuit having said series resonant circuit is in the oscillator stage of said amplifier and wherein resistive means are connected between a point on said line circuit and ground potential for linearizing the response of the amplifier.
Claim 7
Dependent Claim
35 words
A high frequency amplifier as defined in claim 5 wherein said point on said line circuit to which said resistive means is connected represents a nodal point in the frequency response of said line circuit.
Claim 8
Dependent Claim
61 words
A high frequency amplifier as defined in claim 1, wherein the values of the parts of said series resonant are chosen so that the resonant frequency of the series resonant circuit is lower than the resonant frequency of the line circuit at its lowest frequency limit and higher than the resonant frequency of the line circuit at its highest frequency limit.
Claim 9
Dependent Claim
148 words
A circuit in which high frequency electric oscillations are tuned in frequency comprising, in combination: a. a line circuit which resonates at a characteristic frequency and including a variable capacitive diode means connected between one end of the inner conductor of said line circuit and ground, the other end of said inner conductor being connected to the output electrode of a transistor; b. a series resonant circuit including said capacitive diode means and a coil connected in series with said diode means and said one end of said inner conductor, said resonant circuits being such that the tuning thereof follows a slope which is greater for said series resonant circuit than for said resonant line circuit; and c. means for tuning said resonant circuits including means for varying the capacitance of said capacitive diode means to simultaneously vary the resonant frequency of both of the said resonant circuits.
Claim 10
Dependent Claim
148 words
A circuit in which high frequency electric oscillations are tuned in frequency comprising, in combination: a. a line circuit which resonates at a characteristic frequency and including a variable capacitive diode means connected between one end of the inner conductor of said line circuit and ground, the other end of said inner conductor being connected to the output electrode of a transistor; b. a series resonant circuit including said capacitive diode means and a coil connected in series with said diode means and said one end of said inner conductor, said resonant circuits being such that the tuning thereof follows a slope which is greater for said series resonant circuit than for said resonant line circuit; and c. means for tuning said resonant circuits including means for varying the capacitance of said capacitive diode means to simultaneously vary the resonant frequency of both of the said resonant circuits.
Claim 11
Dependent Claim
53 words
A circuit as defined in claim 8 including an interconnected plurality of said resonant line circuits, each of said line circuits including a variable capacitive diode means and each having a series resonant circuit formed by inductive means connected in series with said diode means and the inner conductor of said line circuit.
Claim 12
Dependent Claim
33 words
A circuit as defined in claim 8 wherein the said diode means is connected to a nodal point to of the inner conductor at the node which corresponds to the highest oscillator frequency.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |