Patent US5428318A successfully refreshed from Google Patents.
US5428318A
Expired / Lapsed
US
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Voltage controlled ring oscillator producing a sum output
Assignee: AT&T Inc
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Filing: 1994-02-15
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Granted: 1995-06-27
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Expires: 2014-02-15
Abstract
Abstract A voltage controlled ring oscillator whose frequency does not depend on the number of stages in the ring oscillator. The inventive voltage controlled ring oscillator comprises N inverters connected in series with the output of the Nth inverter being coupled into the input of the first inverter. The output of each inverter is connected to a transconductance amplifier. The outputs of all transconductance amplifiers are summed. The oscillation period of the circuit is 2t d , (where t d is the delay of one inverter) which is independent of the number of inverters in the ring oscillator.
Inventors
- 👤 Behzad Razavi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:40
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03K3/0315; H03K3/0322; H03K3/023; H03K3/0231; H03B; H03B19/00; H03B2201/00; H03B2201/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
An article comprising a voltage controlled oscillator comprising: a plurality of amplifiers connected in a ring, each amplifier having an input, an output and a control port; a means for a control signal which is coupled to the control port of each amplifier; and a plurality of transconductance amplifiers, each transconductance amplifier corresponds to one of said amplifiers, each transconductance amplifier having an input and output port, wherein the output of each amplifier is coupled to the input of the corresponding transconductance amplifier and the outputs of all transconductance amplifiers are summed.
Claim 2
Dependent Claim
92 words
An article comprising a voltage controlled oscillator comprising: a plurality of amplifiers connected in a ring, each amplifier having an input, an output and a control port; a means for a control signal which is coupled to the control port of each amplifier; and a plurality of transconductance amplifiers, each transconductance amplifier corresponds to one of said amplifiers, each transconductance amplifier having an input and output port, wherein the output of each amplifier is coupled to the input of the corresponding transconductance amplifier and the outputs of all transconductance amplifiers are summed.
Claim 3
Dependent Claim
15 words
An article according to claim 1, further comprising a means to provide an output voltage.
Claim 4
Dependent Claim
18 words
An article according to claim 2, further comprising a means to increase the amplitude of the output voltage.
Claim 5
Dependent Claim
11 words
An article according to claim 1, wherein the amplifiers are inverters.
Claim 6
Dependent Claim
18 words
An article according to claim 1, wherein the amplifiers and transconductance amplifiers are implemented using emitter coupled logic.
Claim 7
Dependent Claim
20 words
An article according to claim 1, wherein the amplifiers and transconductance amplifiers are implemented using bipolar complementary metal-oxide semiconductor logic.
Claim 8
Dependent Claim
19 words
An article according to claim 1, wherein the amplifiers and transconductance amplifiers are implemented using complementary metal oxide semiconductor.
Claim 9
Dependent Claim
16 words
An article according to claim 1, wherein the amplifiers, transconductance amplifiers and control signal are differential.
Claim 10
Dependent Claim
16 words
An article according to claim 1, wherein the amplifiers, transconductance amplifiers and control signal are single-ended.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-26 | 2002-12-26 | 2003-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-26 | 2006-12-26 | 2007-06-27 | $7700.00 | Window Closed / Lapsed |