US4517532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable ring oscillator
Assignee: Motorola Solutions Inc
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Filing: 1983-07-01
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Granted: 1985-05-14
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Expires: 2003-07-01
Abstract
Abstract This relates to a programmable ring oscillator which comprises a plurality of series coupled gates the output of the last of which is fed back to the input of the first. Bypass means are coupled across the outputs of selected gates so as to in effect increase or decrease the length of the string. In one embodiment, laser trimmable fuses are employed in the bypass networks. In a second embodiment, a data selector under external control is employed.
Inventors
- 👤 Robert A. Neidorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:30
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03K3/0315; Y; Y10; Y10S; Y10S331/00; Y10S331/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
A programmable ring oscillator comprising: a plurality of series coupled inverter gates; and a plurality of bypass means coupled between the outputs of selected ones of said plurality of inverter gates to alter the frequency of said oscillator, each of said bypass means including a laser trimmable fuse.
Claim 2
Dependent Claim
48 words
A programmable ring oscillator comprising: a plurality of series coupled inverter gates; and a plurality of bypass means coupled between the outputs of selected ones of said plurality of inverter gates to alter the frequency of said oscillator, each of said bypass means including a laser trimmable fuse.
Claim 3
Dependent Claim
20 words
A programmable ring oscillator according to claim 1 wherein each of said inverter gates is an integrated injection logic gate.
Claim 4
Dependent Claim
35 words
A programmable ring oscillator according to claim 1 wherein the output of the last of said plurality of inverter gates is fed back to the input of the first of said plurality of inverter gates.
Claim 5
Dependent Claim
15 words
A programmable ring oscillator according to claim 3 wherein said laser trimmable fuse is aluminum.
Claim 6
Dependent Claim
16 words
A programmable ring oscillator according to claim 3 wherein said laser trimmable fuse is silicon chromium.
Claim 7
Dependent Claim
16 words
A programmable ring oscillator according to claim 3 wherein said laser trimmable fuse is nickel chromium.
Claim 8
Dependent Claim
106 words
A programmable ring oscillator comprising: a plurality of series coupled gates; and at least one bypass means coupled between the outputs of first and second selected ones of said plurality to alter the frequency of said oscillator, wherein said bypass means is a data select switch having first and second data inputs, a control input, and a data output, said first and second data inputs being coupled to the outputs of first and second selected ones respectively of said plurality and said control input being coupled to a control signal which determines which of said first and second data inputs is coupled to said data output.
Claim 9
Dependent Claim
106 words
A programmable ring oscillator comprising: a plurality of series coupled gates; and at least one bypass means coupled between the outputs of first and second selected ones of said plurality to alter the frequency of said oscillator, wherein said bypass means is a data select switch having first and second data inputs, a control input, and a data output, said first and second data inputs being coupled to the outputs of first and second selected ones respectively of said plurality and said control input being coupled to a control signal which determines which of said first and second data inputs is coupled to said data output.
Claim 10
Dependent Claim
39 words
A programmable ring oscillator according to claim 7 wherein said first data input is coupled to the output of the last of said plurality and said data output is coupled to the input of the first of said plurality.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |