US3866138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for an oscillator for at least two frequency ranges and its use as a self-oscillating mixer stage
Assignee: US Philips Corp
•
Filing: 1973-11-15
•
Granted: 1975-02-11
•
Expires: 1993-11-15
Abstract
Abstract An oscillator circuit can oscillate in several frequency ranges due to multiple feedback paths and resonant circuits. Each of the circuits has a varicap diode for tuning. A fixed bias is applied to at least one of the diodes so that a single tuning voltage can be used.
Inventors
- 👤 Walter Putzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:16
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/24; H03J5/242; H03J5/244; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1237; H03B5/124; H03B5/1243; H03F; H03F1/00; H03F1/56; H03F3/00; H03F3/45; H03F3/45071; H03B2200/00; H03B2200/003; H03B2200/004; H03B2200/0048; H03B2200/0056; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
149 words
A circuit arrangement for an oscillator for at least two frequency ranges including an amplifying element in which a frequency-determining tuning circuit with an associated tuning element is connected to an output electrode of the amplifying element for each frequency range, the tuning elements being variable capacity diodes all of which are commonly operated, while for each tuning circuit a capacity feedback path is provided which leads from a point of the relevant tuning circuit to a parallel resonant circuit a branch of which incorporates the input electrodes of the amplifying element, means for ensuring that oscillation conditions are satisfied in only a part of the tuning range of each tuning circuit comprising the elements in the parallel resonant circuit and feedback paths having selected values, characterized in that at least one variable capacity diode is not only connected to a tuning voltage but also to a fixed bias.
Claim 2
Dependent Claim
149 words
A circuit arrangement for an oscillator for at least two frequency ranges including an amplifying element in which a frequency-determining tuning circuit with an associated tuning element is connected to an output electrode of the amplifying element for each frequency range, the tuning elements being variable capacity diodes all of which are commonly operated, while for each tuning circuit a capacity feedback path is provided which leads from a point of the relevant tuning circuit to a parallel resonant circuit a branch of which incorporates the input electrodes of the amplifying element, means for ensuring that oscillation conditions are satisfied in only a part of the tuning range of each tuning circuit comprising the elements in the parallel resonant circuit and feedback paths having selected values, characterized in that at least one variable capacity diode is not only connected to a tuning voltage but also to a fixed bias.
Claim 3
Dependent Claim
47 words
A circuit arrangement as claimed in claim 1, characterized in that the bias is applied to the variable capacity diode through a bias diode which, viewed in the direction of the direct current path is arranged in the opposite direction relative to the relevant variable capacity diode.
Claim 4
Dependent Claim
46 words
A circuit arrangement as claimed in claim 1, characterized in that the frequency-determining elements in the tuning circuits are proportioned in such a manner that each tuning circuit is effective in the steepest possible part of the capacity variation curve of the associated variable capacity diode.
Claim 5
Dependent Claim
92 words
A circuit arrangement as claimed in claim 1, characterized in that an impedance relative to ground is connected to the input of the amplifying element in such a manner that this impedance constitutes a parallel resonant circuit with the input impedance of the amplifying element whose central frequency is located in the highest frequency range of the oscillator frequency to be generated and that the feedback capacitor is chosen to be such that the oscillation conditions are no longer satisfied below the lowest oscillator frequency to be generated in this frequency range.
Claim 6
Dependent Claim
79 words
A circuit arrangement as claimed in claim 1, characterized in that the values of the circuit elements of the tuning circuit located in the feedback path of the lowest frequency range are chosen to be such that they constitute a parallel resonant circuit with a narrow band whose central frequency lies so far below the highest frequency to be generated the lowest frequency range that the oscillation conditions above this highest frequency to be generated are no longer satisfied.
Claim 7
Dependent Claim
59 words
A circuit arrangement as claimed in claim 1, characterized in that at least in the frequency-determining tuning circuit for the lowest fRequency range the capacity of the tuning circuit comprises the series arrangement of one of said variable capacity diodes and a fixed capacitor connected to ground, the feedback path being connected to the junction of the two capacitors.
Claim 8
Dependent Claim
44 words
A circuit arrangement as claimed in claim 1, further comprising means for applying an input signal for each frequency range to the end of the respective feedback capacitor remote from the associated frequency- determining tuning circuit, whereby said circuit comprises a self oscillating mixer.
Claim 9
Dependent Claim
127 words
An oscillator circuit for at least two frequency ranges said circuit comprising an amplifying element having input and output electrodes, a plurality of frequency-determining tuning circuits for said ranges respectively, each of said tuning circuits having an associated variable reactance tuning element coupled to said output electrode, all of the tuning elements being commonly controlled, a resonant circuit coupled to said input electrode, a plurality of feedback paths for said ranges respectively coupled from the respective tuning circuit to said resonant circuit, means for ensuring that oscillation conditions are satisfied in only a part of the tuning range of each tuning circuit comprising the resonant circuit and said feedback paths having selected values, and means for applying to at least one variable reactance element a fixed bias.
Claim 10
Dependent Claim
127 words
An oscillator circuit for at least two frequency ranges said circuit comprising an amplifying element having input and output electrodes, a plurality of frequency-determining tuning circuits for said ranges respectively, each of said tuning circuits having an associated variable reactance tuning element coupled to said output electrode, all of the tuning elements being commonly controlled, a resonant circuit coupled to said input electrode, a plurality of feedback paths for said ranges respectively coupled from the respective tuning circuit to said resonant circuit, means for ensuring that oscillation conditions are satisfied in only a part of the tuning range of each tuning circuit comprising the resonant circuit and said feedback paths having selected values, and means for applying to at least one variable reactance element a fixed bias.
Claim 11
Dependent Claim
16 words
A circuit as claimed in claim 8 wherein said variable reactance elements comprise voltage variable diodes.
Claim 12
Dependent Claim
16 words
A circuit as claimed in claim 8 wherein said resonant circuit comprises a parallel resonant circuit.
Claim 13
Dependent Claim
15 words
A circuit as claimed in claim 8 wherein said feedback paths comprise capacitive feedback 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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |