US3745480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillator circuit for several frequency ranges having plural feedback paths
Assignee: US Philips Corp
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Filing: 1972-05-10
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Granted: 1973-07-10
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Expires: 1992-05-10
Abstract
Abstract Oscillator circuit for several frequency ranges including for each range a frequency-determining resonant circuit having a tuning element, which are all simultaneously operated. From each of said resonant circuits a capacitive feedback path leads to a fixed parallel resonant circuit in the input circuit of an amplifying element.
Inventors
- 👤 W Putzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
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; H03D; H03D7/00; H03D7/12; H03B2200/00; H03B2200/003; H03B2200/004; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A circuit arrangement for an oscillator for at least two frequency ranges including an amplifying element, in which a frequency-determining resonant circuit and an associated tuning element are connected to the output electrode for each frequency range and in which all tuning elements are operated in common, characterized that a capacitive feedback path is provided for each frequency-determining resonant circuit, which path leads from the relevant frequency-determining resonant circuit to a parallel resonant circuit one branch of which includes the input electrodes of the amplifying element, the values of the elements in the feedback paths and in said parallel resonant circuit being chosen to be such that the conditions of self-oscillation are satisfied only in mutually exclusive parts of the tuning range of each frequency-determining resonant circuit.
Claim 2
Dependent Claim
127 words
A circuit arrangement for an oscillator for at least two frequency ranges including an amplifying element, in which a frequency-determining resonant circuit and an associated tuning element are connected to the output electrode for each frequency range and in which all tuning elements are operated in common, characterized that a capacitive feedback path is provided for each frequency-determining resonant circuit, which path leads from the relevant frequency-determining resonant circuit to a parallel resonant circuit one branch of which includes the input electrodes of the amplifying element, the values of the elements in the feedback paths and in said parallel resonant circuit being chosen to be such that the conditions of self-oscillation are satisfied only in mutually exclusive parts of the tuning range of each frequency-determining resonant circuit.
Claim 3
Dependent Claim
90 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 such that this impedance together with the input impedance of the amplifying element, is in resonance at a frequency which is located in the highest frequency range to be generated and the feedback path of the highest frequency range being chosen to be such that the conditions of self-oscillation are no longer satisfied below the lowest oscillator frequency to be generated in said frequency range.
Claim 4
Dependent Claim
62 words
A circuit arrangement as claimed in claim 1 characterized in that the elements of the parallel resonant circuit are chosen to be such that they constitute a narrow-band parallel circuit whose resonant frequency is located so far below the highest frequency to be generated in this range that the conditions of self-oscillation above said highest frequency to be generated are not satisfied.
Claim 5
Dependent Claim
59 words
A circuit arrangement as claimed in claim 1, characterized in that at least for the frequency-determining resonant circuit for the lowest frequency range the capacitor of the resonant circuit consists of the series arrangement of a variable capacitor and a fixed capacitor connected to ground and that the feedback path is connected to the junction of the two capacitors.
Claim 6
Dependent Claim
41 words
A circuit arrangement as claimed in claim 1 for use as a self-oscillating mixer stage, characterized in that the input signal of each frequency range is applied to the terminal of the feedback path remote from the associated frequency-determining resonant circuit.
Claim 7
Dependent Claim
95 words
A circuit comprising an amplifying means having an input and an output; at least two resonant circuits coupled to said output and having low and high frequency ranges respectively, each of said resonant circuits having a tuning element; means coupling said tuning elements together for a common tuning control; and means for causing oscillation using said resonant circuits in mutually exclusive portions of the tuning range comprising a parallel resonant circuit coupled to said input, and two feedback circuits coupled to said high and low frequency resonant circuits respectively and to said parallel resonant circuit.
Claim 8
Dependent Claim
95 words
A circuit comprising an amplifying means having an input and an output; at least two resonant circuits coupled to said output and having low and high frequency ranges respectively, each of said resonant circuits having a tuning element; means coupling said tuning elements together for a common tuning control; and means for causing oscillation using said resonant circuits in mutually exclusive portions of the tuning range comprising a parallel resonant circuit coupled to said input, and two feedback circuits coupled to said high and low frequency resonant circuits respectively and to said parallel resonant circuit.
Claim 9
Dependent Claim
54 words
A circuit as claimed in claim 6 further comprising means for preventing oscillation below the lowest frequency of said high frequency range using said high frequency circuit comprising an impedance element coupled between said input and ground which resonates together with the amplifying means input impedance at a frequency within said high frequency range.
Claim 10
Dependent Claim
50 words
A circuit as claimed in claim 6 further comprising means for preventing oscillation using said low frequency circuit above the lowest frequency of said high frequency range comprising said parallel resonant circuit comprising a narrow band circuit having a resonant frequency below the highest frequency of said high frequency range.
Claim 11
Dependent Claim
42 words
A circuit as claimed in claim 6 wherein said low frequency resonant circuit tuning element comprises a variable capacitor and a fixed capacitor series coupled to said variable capacitor, said low frequency feedback circuit being coupled to the junction of said capacitors.
Claim 12
Dependent Claim
43 words
A circuit as claimed in claim 6 further comprising means for utilizing said circuit as a self oscillating mixer stage comprising a pair of input means respectively coupled to the ends of said feedback means that are coupled to said parallel resonant circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |