US3764911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for measuring the duration of an electrical pulse
Assignee: US Philips Corp
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Filing: 1971-11-15
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Granted: 1973-10-09
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Expires: 1991-11-15
Abstract
Abstract The specification of the application discloses a pulse width measuring device including a Schmitt trigger driven by the signal pulse and having a reference voltage derived from the signal pulse.
Inventors
- 👤 P East
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:58
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/12; G; G01; G01R; G01R29/00; G01R29/02; G04; G04F; G04F10/00; H03K3/00; H03K3/02; H03K3/04; H03K3/05; H03K3/06; H03K3/12; H03K3/13; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/2893; H03K5/153
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
A device for measuring the duration of an electrical pulse signal comprising a Schmitt trigger cirucit having a pulse signal input and a reference voltage input, the Schmitt trigger being set to a first state in response to a first predetermined voltage difference between the pulse signal input and the reference signal input, and being reset in response to a second predetermined voltage difference between the reference signal input and the pulse signal input, pulse shaping means for deriving a reference voltage from the pulse signal and for applying the reference voltage to the reference voltage input, and time measuring means controlled by the Schmitt trigger for recording the period during which the trigger is in its first state.
Claim 2
Independent Claim
119 words
A device for measuring the duration of an electrical pulse signal comprising a Schmitt trigger cirucit having a pulse signal input and a reference voltage input, the Schmitt trigger being set to a first state in response to a first predetermined voltage difference between the pulse signal input and the reference signal input, and being reset in response to a second predetermined voltage difference between the reference signal input and the pulse signal input, pulse shaping means for deriving a reference voltage from the pulse signal and for applying the reference voltage to the reference voltage input, and time measuring means controlled by the Schmitt trigger for recording the period during which the trigger is in its first state.
Claim 3
Dependent Claim
25 words
A device according to claim 1 wherein the pulse shaping means includes a delay device for delaying the pulse signal to form the reference voltage.
Claim 4
Dependent Claim
14 words
A device according to claim 2 wherein the delay device comprises an electrical coil.
Claim 5
Dependent Claim
37 words
A device according to claim 2 wherein the delay time of the delay device is equal to or greater than the rise time of the pulse signal and is less than the duration of the pulse signal.
Claim 6
Dependent Claim
41 words
A device according to claim 1 wherein the pulse shaping means includes limiting means for limiting the amplitude of the pulse signal by a predetermined amount and further includes a pulse stretcher for extending the fall time of the pulse signal.
Claim 7
Dependent Claim
35 words
A device according to claim 5 wherein the predetermined amount is equal to or greater than that amount by which the input signal must exceed the reference voltage to cause the Schmitt trigger to set.
Claim 8
Dependent Claim
23 words
A device according to claim 5 wherein the pulse stretcher comprises an emitter-follower connected transistor having its emitter resistor shunted by a capacitor.
Claim 9
Dependent Claim
44 words
A device according to claim 5, in which the limiting means comprises an amplitude limiter which limits the amplitude of the pulse signal to the predetermined amount, and a subtractor which subtracts the limited signal from the pulse signal to form the reference voltage.
Claim 10
Dependent Claim
36 words
A device according to claim 1 wherein the pulse shaping means includes a differentiator for differentiating the pulse signal and a subtractor for subtracting the differentiated signal from the pulse signal to form the reference voltage.
Claim 11
Dependent Claim
35 words
A device according to claim 1 wherein the time measuring means includes a counter for counting the number of clock pulses generated by a clock pulse generator during the set duration of the Schmitt trigger.
Claim 12
Dependent Claim
45 words
A device according to claim 10 wherein the time measuring means further includes an AND gate having the outputs of the Schmitt trigger and of the clock pulse generator as inputs, the output of the AND gate being connected to the iNput of the counter.
Claim 13
Dependent Claim
16 words
A device according to claim 10 wherein the counter is provided with an output display device.
Claim 14
Dependent Claim
18 words
A device according to claim 10 wherein the counter output is in the form of a digital readout.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |