US3815052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage controlled oscillator
Assignee: Hitachi Ltd
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Filing: 1973-01-29
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Granted: 1974-06-04
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Expires: 1993-01-29
Abstract
Abstract A voltage controlled oscillator comprising an amplifier, a series resonance circuit, formed of a coil, a capacitor and a resistor, to which the output of said amplifier is supplied, a composite circuit for taking the vectorial sum and difference between a voltage across said resistor and a voltage across said coil or capacitor, a circuit for vectorially adding the sum signal and the difference signal at rates responsive to an external control voltage, and means to positively feedback the output of the adder circuit to the input side of said amplifier, the phase of said output of said adder circuit being changed in response to said external control voltage, to make the oscillation frequency of said oscillator variable.
Inventors
- 👤 Y Watatani
- 👤 K Mohri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:15
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/02; H03B5/08; H03B5/12; H03B5/1206; H03B5/1212; H03B5/1215; H03B5/1231; H03B5/1237; H03B5/124; H03B5/1243; H03B5/1256
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
157 words
In a voltage controlled oscillator having an amplifier and a feedback circuit to positively feedback an output of said amplifier to an input thereof, said feedback circuit comprising: 1. an oscillation frequency determining means having a specific oscillation frequency and to which said output of said amplifier is supplied for providing two signals having a fixed phase difference therebetween, 2. composite circuit means for generating first and second signals representing a vectorial addition and a vectorial subtraction, respectively, between said two signals from said frequency determining means, and 3. an adder circuit which vectorially adds said first signal and said second signal provided from said composite circuit means at a rate responsive to a control voltage externally applied, and whose output is fed back to the input side of said amplifier, the phase of the output signal of said aDder circuit being changed by said control voltage, thereby to make the oscillation frequency of said oscillator variable.
Claim 2
Dependent Claim
157 words
In a voltage controlled oscillator having an amplifier and a feedback circuit to positively feedback an output of said amplifier to an input thereof, said feedback circuit comprising: 1. an oscillation frequency determining means having a specific oscillation frequency and to which said output of said amplifier is supplied for providing two signals having a fixed phase difference therebetween, 2. composite circuit means for generating first and second signals representing a vectorial addition and a vectorial subtraction, respectively, between said two signals from said frequency determining means, and 3. an adder circuit which vectorially adds said first signal and said second signal provided from said composite circuit means at a rate responsive to a control voltage externally applied, and whose output is fed back to the input side of said amplifier, the phase of the output signal of said aDder circuit being changed by said control voltage, thereby to make the oscillation frequency of said oscillator variable.
Claim 3
Dependent Claim
28 words
composite circuit means for generating first and second signals representing a vectorial addition and a vectorial subtraction, respectively, between said two signals from said frequency determining means, and
Claim 4
Dependent Claim
28 words
composite circuit means for generating first and second signals representing a vectorial addition and a vectorial subtraction, respectively, between said two signals from said frequency determining means, and
Claim 5
Dependent Claim
45 words
means to connect in common a collector of one of said fourth and fifth transistors in the first transistor circuit and a collector of one of said fourth and fifth transistors in the second transistor circuit, thereby to obtain an output from the common terminal.
Claim 6
Dependent Claim
45 words
means to connect in common a collector of one of said fourth and fifth transistors in the first transistor circuit and a collector of one of said fourth and fifth transistors in the second transistor circuit, thereby to obtain an output from the common terminal.
Claim 7
Dependent Claim
45 words
means to connect in common a collector of one of said fourth and fifth transistors in the first transistor circuit and a collector of one of said fourth and fifth transistors in the second transistor circuit, thereby to obtain an output from the common terminal.
Claim 8
Dependent Claim
45 words
means to connect in common a collector of one of said fourth and fifth transistors in the first transistor circuit and a collector of one of said fourth and fifth transistors in the second transistor circuit, thereby to obtain an output from the common terminal.
Claim 9
Dependent Claim
57 words
means to apply one signal from said oscillation frequency determining means across respective bases of said first and second transistors in each of the first and second transistor circuits, and means to apply the other signal from said oscillation frequency determining means across respective bases of said first and second transistors in the third transistor circuit, and
Claim 10
Dependent Claim
57 words
means to apply one signal from said oscillation frequency determining means across respective bases of said first and second transistors in each of the first and second transistor circuits, and means to apply the other signal from said oscillation frequency determining means across respective bases of said first and second transistors in the third transistor circuit, and
Claim 11
Dependent Claim
53 words
The voltage controlled oscillator according to claim 1 wherein said oscillation frequency determining means comprises a series circuit consisting of a capacitor, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from across said capacitor.
Claim 12
Dependent Claim
68 words
an adder circuit which vectorially adds said first signal and said second signal provided from said composite circuit means at a rate responsive to a control voltage externally applied, and whose output is fed back to the input side of said amplifier, the phase of the output signal of said aDder circuit being changed by said control voltage, thereby to make the oscillation frequency of said oscillator variable.
Claim 13
Dependent Claim
68 words
an adder circuit which vectorially adds said first signal and said second signal provided from said composite circuit means at a rate responsive to a control voltage externally applied, and whose output is fed back to the input side of said amplifier, the phase of the output signal of said aDder circuit being changed by said control voltage, thereby to make the oscillation frequency of said oscillator variable.
Claim 14
Dependent Claim
94 words
means to connect in common the collector of one of said first and second transistors in said first transistor circuit and the collector of one of said first and second transistors in said third transistor circuit, thereby to obtain a first output from the common terminal, and means to connect in common the collector of one of said first and second transistors in said second transistor circuit and the collector of the other of said first and second transistors in said third transistor circuit, thereby to obtain a second output from the common terminal.
Claim 15
Dependent Claim
94 words
means to connect in common the collector of one of said first and second transistors in said first transistor circuit and the collector of one of said first and second transistors in said third transistor circuit, thereby to obtain a first output from the common terminal, and means to connect in common the collector of one of said first and second transistors in said second transistor circuit and the collector of the other of said first and second transistors in said third transistor circuit, thereby to obtain a second output from the common terminal.
Claim 16
Dependent Claim
53 words
The voltage controlled oscillator according to claim 1 wherein said oscillation frequency determining means comprises a series circuit consisting of a capacitor, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from across said coil.
Claim 17
Dependent Claim
14 words
The voltage controlled oscillator according to claim 1 wherein said composite circuit means comprises:
Claim 18
Dependent Claim
13 words
The voltage controlled oscillator according to claim 4 wherein said adder circuit comprises:
Claim 19
Dependent Claim
53 words
The voltage controlled oscillator according to claim 5 wherein said oscillation frequency determining means comprises a series circuit consisting of a capacitor, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from across said capacitor.
Claim 20
Dependent Claim
53 words
The voltage controlled oscillator according to claim 5 wherein said oscillation frequency determining means comprises a series circuit consisting of a capacitor, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from across said coil.
Claim 21
Dependent Claim
55 words
The voltage controlled oscillator according to claim 5 wherein said oscillation frequency determining means comprises a series circuit consisting of a capacitor, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from a center-tap of said coil.
Claim 22
Dependent Claim
57 words
The voltage controlled oscillator according to claim 5 wHerein said oscillation frequency determining means comprises a series circuit consisting of a pair of capacitors, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from a point between said capacitors.
Claim 23
Dependent Claim
13 words
The voltage contrilled oscillator according to claim 1 wherein said adder circuit comprises:
Claim 24
Dependent Claim
55 words
The voltage controlled oscillator according to claim 1 wherein said oscillation frequency determining means comprises a series circuit consisting of a capacitor, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from a center-tap of said coil.
Claim 25
Dependent Claim
57 words
The voltage controlled oscillator according to claim 1 wherein said oscillation frequency determining means comprises a series circuit consisting of a pair of capacitors, a coil and a resistor, one of said two signals having the fixed phase difference therebetween being derived from across said resistor and the other being derived from a point between said capacitors.
References Cited (Backward Citations)
US3691475A
Cited
US3686587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |