Patent EP0265666A2 successfully refreshed from Google Patents.
EP0265666A2
Expired / Lapsed
EP
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Integrated high gain voltage controlled oscillator
Assignee: International Business Machines Corp
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Filing: 1987-09-22
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Granted: —
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Expires: 2007-09-22
Abstract
Abstract A voltage controlled oscillator is formed of a plurality of cascaded inverter stages in a ring configuration. Each inverter stage is a grounded emitter circuit having an active pull-stage in order to achieve a short stage delay. The frequency of the ring oscillator is determined by the number of inverter stages, and the gain is selectable by coupling an external control voltage to only certain of the inverters. The VCO may be fabricated on a single integrated circuit along with the other circuits necessary to form a phase locked loop or other frequency generation system.
Inventors
- 👤 John Farley Even
- 👤 Joseph Michael Mosley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:03
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03K3/0315; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/099; H03L7/0995
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
191 words
A voltage controlled oscillator comprising : a plurality of inverter stages connected in a ring configuration, each said inverter stage having an input terminal and an output terminal with the input terminal of each said stage being connected to the output terminal of the next preceding stage, each said inverter stage comprising : first and second transistors each having an emitter, a base and a collector, wherein the base of said first transistor is the inverter stage input terminal and the collector of said first transistor is the inverter stage output terminal, the emitter of said second transistor being connected to the collector of said first transistor, the collector of said second transistor being connected to a first power supply terminal and the emitter of said first transistor being connected to a second power supply terminal, and a resistor connected between the base and the emitter of said second transistor, generator means connected to the base of said second transistor in each of said inverter stages for providing a control voltage thereto; and oscillator output terminals connected between the input and output terminals of one of said plurality of inverter stages.
Claim 2
Dependent Claim
191 words
A voltage controlled oscillator comprising : a plurality of inverter stages connected in a ring configuration, each said inverter stage having an input terminal and an output terminal with the input terminal of each said stage being connected to the output terminal of the next preceding stage, each said inverter stage comprising : first and second transistors each having an emitter, a base and a collector, wherein the base of said first transistor is the inverter stage input terminal and the collector of said first transistor is the inverter stage output terminal, the emitter of said second transistor being connected to the collector of said first transistor, the collector of said second transistor being connected to a first power supply terminal and the emitter of said first transistor being connected to a second power supply terminal, and a resistor connected between the base and the emitter of said second transistor, generator means connected to the base of said second transistor in each of said inverter stages for providing a control voltage thereto; and oscillator output terminals connected between the input and output terminals of one of said plurality of inverter stages.
Claim 3
Dependent Claim
15 words
The voltage controlled oscillator of claim 1, wherein said second power supply terminal is grounded.
Claim 4
Dependent Claim
25 words
The voltage controlled oscillator of claim 1, wherein said plurality of inverter stages and said generator means are formed on a single integrated circuit chip.
Claim 5
Dependent Claim
58 words
The voltage controlled oscillator of claim 1, wherein said generator means comprises : a fixed control voltage generator for applying a fixed bias voltage to selected of said inverter stages; and a variable control voltage generator for applying to the remainder of said inverter stages a signal formed of said fixed bias voltage and a variable control voltage.
Claim 6
Dependent Claim
19 words
The voltage controlled oscillator of claim 1, wherein the gain of said oscillator is at least about 1 GHz./volt.
Claim 7
Dependent Claim
241 words
A phase locked loop system comprising : input and output terminals, phase detector means connected to said input terminal, filter means connected to an output of said phase detector means, voltage controlled oscillator means connected to an output of said filter means and an input of said phase detector means, said voltage controlled oscillator comprising : a plurality of inverter stages connected in a ring configuration, each said inverter stage having an input terminal and an output terminal with the input terminal of each said stage being connected to the output terminal of the next preceding stage, each said inverter stage comprising : first and second transistors each having an emitter, a base and a collector, wherein the base of said first transistor is the inverter stage input terminal and the collector of said first transistor is the inverter stage output terminal, the emitter of said second transistor being connected to the collector of said first transistor, the collector of said second transistor being connected to a first power supply terminal and the emitter of said first transistor being connected to a second power supply terminal, and a resistor connected between the base and the emitter of said second transistor, generator means connected to the base of said second transistor in each of said inverter stages for providing a control voltage thereto; and oscillator output terminals connected between the input and output terminals of one of said plurality of inverter stages.
Claim 8
Dependent Claim
241 words
A phase locked loop system comprising : input and output terminals, phase detector means connected to said input terminal, filter means connected to an output of said phase detector means, voltage controlled oscillator means connected to an output of said filter means and an input of said phase detector means, said voltage controlled oscillator comprising : a plurality of inverter stages connected in a ring configuration, each said inverter stage having an input terminal and an output terminal with the input terminal of each said stage being connected to the output terminal of the next preceding stage, each said inverter stage comprising : first and second transistors each having an emitter, a base and a collector, wherein the base of said first transistor is the inverter stage input terminal and the collector of said first transistor is the inverter stage output terminal, the emitter of said second transistor being connected to the collector of said first transistor, the collector of said second transistor being connected to a first power supply terminal and the emitter of said first transistor being connected to a second power supply terminal, and a resistor connected between the base and the emitter of said second transistor, generator means connected to the base of said second transistor in each of said inverter stages for providing a control voltage thereto; and oscillator output terminals connected between the input and output terminals of one of said plurality of inverter stages.
Claim 9
Dependent Claim
16 words
The phase locked loop system of claim 6, wherein said second power supply terminal is grounded.
Claim 10
Dependent Claim
26 words
The phase locked loop system of claim 6, wherein said plurality of inverter stages and said generator means are formed on a single integrated circuit chip.
Claim 11
Dependent Claim
22 words
The phase locked loop system of claim 6, wherein the gain of said voltage controlled oscillator is at least about 1 GHz./volt.
Claim 12
Dependent Claim
59 words
The phase locked loop system of claim 6, wherein said generator means comprises : a fixed control voltage generator for applying a fixed bias voltage to selected of said inverter stages; and a variable control voltage generator for applying to the remainder of said inverter stages a signal formed of said fixed bias voltage and a variable control voltage.
References Cited (Backward Citations)
No citation records indexed.
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