US4633195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced oscillator with constant emitter voltage level
Assignee: NXP USA Inc
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Filing: 1985-11-21
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Granted: 1986-12-30
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Expires: 2005-11-21
Abstract
Abstract A balanced LC oscillator for providing differential oscillator output signals includes a pair of transistors the emitters of which are connected to a voltage reference source that provides a fixed voltage thereto. The base electrodes of each transistor is cross coupled to the collector of the other transistor. The LC tank circuit is connected between the collectors of the two transistors and current supply is provided thereto. Although the potential at the bases of the two transistors vary with respect to the oscillator signal appearing thereat, the emitters are held at a fixed potential to eliminate any common mode signal that may otherwise be generated if the potential at the emitters was permitted to vary.
Inventors
- 👤 W. Eric Main
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:17
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1206; H03B5/1212; H03B5/1215; H03B5/1231; H03B2200/00; H03B2200/006; H03B2200/0062; H03B2200/0098
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
A balanced oscillator including frequency determining means connected between first and second terminals, comprising: first and second transistors each having first, second and control electrodes, said first electrodes being connected together, said control electrode of said first transistor being coupled both to the first terminal and said second electrode of said second transistor, said control electrode of said second transistor being coupled both to the second terminal and said second electrode of said first transistor; current source means for supplying operating current to said first and second transistors; and voltage reference means for supplying a predetermined and fixed voltage at said connected first electrodes of said first and second transistors.
Claim 2
Dependent Claim
110 words
A balanced oscillator including frequency determining means connected between first and second terminals, comprising: first and second transistors each having first, second and control electrodes, said first electrodes being connected together, said control electrode of said first transistor being coupled both to the first terminal and said second electrode of said second transistor, said control electrode of said second transistor being coupled both to the second terminal and said second electrode of said first transistor; current source means for supplying operating current to said first and second transistors; and voltage reference means for supplying a predetermined and fixed voltage at said connected first electrodes of said first and second transistors.
Claim 3
Dependent Claim
50 words
The oscillator of claim 1 wherein said current source means includes: a first current source for supplying current at an output thereof which output is connected to the first terminal; and a second current source for supplying current at an output thereof which output is connected to the second terminal.
Claim 4
Dependent Claim
78 words
The oscillator of claim 2 wherein said voltage reference means includes: a third current source for supplying a current at an output; a third transistor having first, second and control electrodes, said first electrode being adapted to receive a ground reference potential; and voltage determining means connected to said output of said third current source and said second and control electrodes of said third transistor for establishing said fixed voltage at the second electrode of said third transistor.
Claim 5
Dependent Claim
72 words
The oscillator of claim 3 wherein said voltage determining means includes: diode means coupled between said output of said third current source and said second electrode of said third transistor; and first and second series connected resistors coupled between said output of said third current source and said second electrode of said third transistor, said control electrode of said third transistor being coupled to the interconnection of said first and second resistors.
Claim 6
Dependent Claim
113 words
An integrated oscillator having first and second terminals across which a frequency determining circuit is coupled, comprising: first and second transistors each having first, second and control electrodes, said first electrodes being connected together, said control electrode of said first transistor being coupled both to the first terminal and said second electrode of said second transistor, said control electrode of said second transistor being coupled both to the second terminal and said second electrode of said first transistor; current source means for supplying operating current to said first and second transistors; and voltage reference means for supplying a predetermined and fixed voltage at said connected first electrodes of said first and second transistors.
Claim 7
Dependent Claim
113 words
An integrated oscillator having first and second terminals across which a frequency determining circuit is coupled, comprising: first and second transistors each having first, second and control electrodes, said first electrodes being connected together, said control electrode of said first transistor being coupled both to the first terminal and said second electrode of said second transistor, said control electrode of said second transistor being coupled both to the second terminal and said second electrode of said first transistor; current source means for supplying operating current to said first and second transistors; and voltage reference means for supplying a predetermined and fixed voltage at said connected first electrodes of said first and second transistors.
Claim 8
Dependent Claim
50 words
The oscillator of claim 5 wherein said current source means includes: a first current source for supplying current at an output thereof which output is connected to the first terminal; and a second current source for supplying current at an output thereof which output is connected to the second terminal.
Claim 9
Dependent Claim
78 words
The oscillator of claim 6 wherein said voltage reference means includes: a third current source for supplying a current at an output; a third transistor having first, second and control electrodes, said first electrode being adapted to receive a ground reference potential; and voltage determining means connected to said output of said third current source and said second and control electrodes of said third transistor for establishing said fixed voltage at the second electrode of said third transistor.
Claim 10
Dependent Claim
72 words
The oscillator of claim 7 wherein said voltage determining means includes: diode means coupled between said output of said third current source and said second electrode of said third transistor; and first and second series connected resistors coupled between said output of said third current source and said second electrode of said third transistor, said control electrode of said third transistor being coupled to the interconnection of said first and second resistors.
Claim 11
Dependent Claim
126 words
In a balanced modulator having first and second inputs and including an oscillator providing a differential oscillator signal at the first and second inputs, the improvement comprising said oscillator including; first and second transistors each having first, second and control electrodes, said first electrodes being connected together, said control electrode of said first transistor being coupled both to the first terminal and said second electrode of said second transistor, said control electrode of said second transistor being coupled both to the second terminal and said second electrode of said first transistor; current source means for supplying operating current to said first and second transistors; and voltage reference means for supplying a predetermined and fixed voltage at said connected first electrodes of said first and second transistors.
Claim 12
Dependent Claim
126 words
In a balanced modulator having first and second inputs and including an oscillator providing a differential oscillator signal at the first and second inputs, the improvement comprising said oscillator including; first and second transistors each having first, second and control electrodes, said first electrodes being connected together, said control electrode of said first transistor being coupled both to the first terminal and said second electrode of said second transistor, said control electrode of said second transistor being coupled both to the second terminal and said second electrode of said first transistor; current source means for supplying operating current to said first and second transistors; and voltage reference means for supplying a predetermined and fixed voltage at said connected first electrodes of said first and second transistors.
Claim 13
Dependent Claim
50 words
The oscillator of claim 9 wherein said current source means includes: a first current source for supplying current at an output thereof which output is connected to the first terminal; and a second current source for supplying current at an output thereof which output is connected to the second terminal.
Claim 14
Dependent Claim
78 words
The oscillator of claim 10 wherein said voltage reference means includes: a third current source for supplying a current at an output; a third transistor having first, second and control electrodes, said first electrode being adapted to receive a ground reference potential; and voltage determining means connected to said output of said third current source and said second and control electrodes of said third transistor for establishing said fixed voltage at the second electrode of said third transistor.
Claim 15
Dependent Claim
72 words
The oscillator of claim 11 wherein said voltage determining means includes: diode means coupled between said output of said third current source and said second electrode of said third transistor; and first and second series connected resistors coupled between said output of said third current source and said second electrode of said third transistor, said control electrode of said third transistor being coupled to the interconnection of said first and second resistors.
References Cited (Backward Citations)
DE3326382A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |