Patent US3902139A successfully refreshed from Google Patents.
US3902139A
Expired / Lapsed
US
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Temperature compensated pulse generator
Assignee: Mobil Oil AS
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Filing: 1974-01-14
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Granted: 1975-08-26
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Expires: 1994-01-14
Abstract
Abstract In a voltage-controlled pulse generator, a summing integrator provides a ramping output voltage at a rate proportional to the summation of a first input current from a reference voltage source and a second input current from a variable voltage source. A comparator provides an output pulse when the integrator output has ramped from an initial level to a fixed reference level. This output pulse operates a switch which provides a third input current to the integrator which resets its output voltage to its initial voltage level. The basic frequency of the output pulses is set by the first current flow from the reference voltage source and may be changed by varying the variable voltage source to change the second current flow.
Inventors
- 👤 John W Harrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:49
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/56
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
188 words
A pulse generator comprising: a. a summing integrator, b. means for providing a reference current to the input of said summing integrator, c. means for providing a variable current to the input of said summing integrator, whereby the output of said integrator ramps in a first direction at a rate proportional to the summation of said reference and variable currents at its input, d. means responsive to the ramping output of said integrator for providing a pulse when said output reaches a first predetermined voltage level, and e. means responsive to said pulse for providing a third current to the input of said integrator opposite in direction to said reference and variable currents and sufficiently greater than the summation of said reference and variable currents such that the output of said integrator ramps in a second direction opposite to that of said first direction at a rate proportional to said third current, said means varying said third current linearly with temperature variations to change the rate at which said integrator ramps in said second direction, thereby compensating for drifts in the frequency of said pulses under temperature variations.
Claim 2
Dependent Claim
188 words
A pulse generator comprising: a. a summing integrator, b. means for providing a reference current to the input of said summing integrator, c. means for providing a variable current to the input of said summing integrator, whereby the output of said integrator ramps in a first direction at a rate proportional to the summation of said reference and variable currents at its input, d. means responsive to the ramping output of said integrator for providing a pulse when said output reaches a first predetermined voltage level, and e. means responsive to said pulse for providing a third current to the input of said integrator opposite in direction to said reference and variable currents and sufficiently greater than the summation of said reference and variable currents such that the output of said integrator ramps in a second direction opposite to that of said first direction at a rate proportional to said third current, said means varying said third current linearly with temperature variations to change the rate at which said integrator ramps in said second direction, thereby compensating for drifts in the frequency of said pulses under temperature variations.
Claim 3
Dependent Claim
70 words
The pulse generator of claim 1 wherein said means for providing said third current comprises: a. a second reference voltage source, b. a switch which operates in response to said pulses, said switch being closed during the period of each of said pulses, and c. a positive temperature coefficient resistance connecting said second reference voltage source to the input of said integrator in response to the closing of said switch.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |