US5220203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pulse width precision pulse generator
Assignee: Analogic Corp
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Filing: 1990-11-21
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Granted: 1993-06-15
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Expires: 2010-11-21
Abstract
Abstract A variable pulse width precision pulse generator includes a constant current source for producing a number of different constant currents; a charge storage device whose voltage output is proportional to the charge stored; and gating means responsive to an input signal for controlling the time during which the constant current source charges the charge storage device to produce a ramp voltage; a first comparator responsive to the voltage ramp for detecting a first level of the ramp; a second comparator responsive to the voltage ramp for detecting a second level of the ramp; and logic means responsive to the comparators for providing a precision pulse during the presence of the input signal between the occurrence of the detection of the first and second levels of the ramp by the comparators.
Inventors
- 👤 Richard H. McMorrow, Jr.
- 👤 Hans Weedon
- 👤 Enrico Dolazza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:48
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/04; H03K7/00; H03K7/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
A variable pulse width precision pulse generator comprising: a constant current source means for producing a number of different constant currents; a charge storage device, responsive to said constant current source means, whose voltage output is proportional to the charge stored; gating means, responsive to an input signal, for controlling the time during which the constant current source charges said charge storage device to produce a ramp voltage; a first comparator responsive to said voltage ramp for detecting a first level of said ramp; a second comparator responsive to said voltage ramp for detecting a second level of said ramp; and logic means, responsive to said first and second comparators, for providing a precision pulse during the presence of the input signal between the occurrence of the detection of said first and second levels of said ramp by said comparators.
Claim 2
Dependent Claim
140 words
A variable pulse width precision pulse generator comprising: a constant current source means for producing a number of different constant currents; a charge storage device, responsive to said constant current source means, whose voltage output is proportional to the charge stored; gating means, responsive to an input signal, for controlling the time during which the constant current source charges said charge storage device to produce a ramp voltage; a first comparator responsive to said voltage ramp for detecting a first level of said ramp; a second comparator responsive to said voltage ramp for detecting a second level of said ramp; and logic means, responsive to said first and second comparators, for providing a precision pulse during the presence of the input signal between the occurrence of the detection of said first and second levels of said ramp by said comparators.
Claim 3
Dependent Claim
19 words
The variable pulse width precision pulse generator of claim 1 in which said charge storage device is a capacitor.
Claim 4
Dependent Claim
38 words
The variable pulse width precision pulse generator of claim 1 in which said constant current source includes pulse width selection means for selecting a constant current value for producing a ramp voltage representative of a desired pulse width.
Claim 5
Dependent Claim
33 words
The variable pulse width precision pulse generator of claim 2 in which said gating means shunts said charge storage device to ground to alternately enable charging and discharging of said charge storage device.
Claim 6
Dependent Claim
28 words
The variable pulse width precision pulse generator of claim 1 in which each of said comparators includes a reference input for defining the ramp level to be detected.
Claim 7
Dependent Claim
19 words
The variable pulse width precision pulse generator of claim 1 in which said logic means is an AND gate.
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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |