US3921081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse generator for producing pulses of definable width
Assignee: General Electric Co
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Filing: 1974-10-30
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Granted: 1975-11-18
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Expires: 1994-10-30
Abstract
Abstract A pulse generating circuit provides a series of pulses each of which is a given percentage or portion of the period of a source signal the frequency of which may vary over a fairly substantial range. This circuit recognizes a prescribed condition of the source signal to initiate a timing period the length of which is a function of the frequency of the source signal. Pulses each having a width of the period so timed are thus generated which pulses are a given percentage of the period of the source of the signal.
Inventors
- 👤 Lawrence Jubin Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:53
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A pulse generating circuit providing pulses each having a width corresponding to a prescribed percentage of the period of a variable frequency source signal comprising: a. means to provide a pulse initiation signal in response to a prescribed condition of said source signal; b. means to generate a pulse termination signal after a period of time from the occurrence of said initiation signal including means responsive to the frequency of said source signal to determine said period of time; and c. means responsive to said initiation signal and said termination signal to provide an output pulse having a duration corresponding to said time period.
Claim 2
Dependent Claim
104 words
A pulse generating circuit providing pulses each having a width corresponding to a prescribed percentage of the period of a variable frequency source signal comprising: a. means to provide a pulse initiation signal in response to a prescribed condition of said source signal; b. means to generate a pulse termination signal after a period of time from the occurrence of said initiation signal including means responsive to the frequency of said source signal to determine said period of time; and c. means responsive to said initiation signal and said termination signal to provide an output pulse having a duration corresponding to said time period.
Claim 3
Dependent Claim
160 words
A pulse generating circuit for providing pulses having a width which is a given percentage of the period of a variable frequency source signal comprising: a. means to provide a control signal having a value proportional to the frequency of said source signal; b. means to provide a first switching signal in response to a predetermined condition of said source signal; c. means responsive to said control signal to provide a second switching signal after a period of time, said period of time being a function of the value of said control signal; and, d. a bistable switch responsive to said first and second switching signals to assume, respectively, first and second states of operation and to provide an output signal indicative of said states of operation, the time period during which the output signal corresponds to said first state of operation being a pulse which has a width as a given percentage of the period of the source signal.
Claim 4
Dependent Claim
160 words
A pulse generating circuit for providing pulses having a width which is a given percentage of the period of a variable frequency source signal comprising: a. means to provide a control signal having a value proportional to the frequency of said source signal; b. means to provide a first switching signal in response to a predetermined condition of said source signal; c. means responsive to said control signal to provide a second switching signal after a period of time, said period of time being a function of the value of said control signal; and, d. a bistable switch responsive to said first and second switching signals to assume, respectively, first and second states of operation and to provide an output signal indicative of said states of operation, the time period during which the output signal corresponds to said first state of operation being a pulse which has a width as a given percentage of the period of the source signal.
Claim 5
Dependent Claim
26 words
The invention in accordance with claim 2 when said control signal is a voltage signal having a magnitude proportional to the frequency of said source signal.
Claim 6
Dependent Claim
51 words
The invention in accordance with claim 3 wherein the means responsive to the control signal includes an integrating circuit for providing an output in response to said control signal and a comparison circuit for comparing the output of said integrating circuit with a reference signal to provide said second switching signal.
Claim 7
Dependent Claim
19 words
The invention in accordance with claim 4 wherein each of said integrating and comparison circuits employs an operational amplifier.
Claim 8
Dependent Claim
25 words
The invention in accordance with claim 3 wherein the operation of the integrated circuit is initiated in response to said switch assuming said first state.
Claim 9
Dependent Claim
22 words
The invention in accordance with claim 4 wherein the integrating circuit includes means to inhibit integration in excess of a prescribed value.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |