US3760272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impedance signal level detector
Assignee: Individual
•
Filing: 1970-08-25
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Granted: 1973-09-18
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Expires: 1990-08-25
Abstract
Abstract A high impedance signal level detector for use in electronic apparatus, such as instrumentation and the like, whereby pairs of electronic pulses may be generated in which the elapsed time between the pulses in each pair is as directly proportional as desired, or nearly so, to the amplitude of an applied DC voltage. Means are provided for the precise adjustment of the time between pulses in each pair to compensate for circuit component variations, or to provide a deliberately induced off-set in time between the pulses in each pair which is not related to the amplitude of the applied input signal voltage.
Inventors
- 👤 R Battes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:16
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/25; G01R19/255
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
276 words
High impedance signal detecting apparatus for receiving an input signal and for generating a pair of output pulses having a time interval therebetween corresponding to said input signal, said apparatus comprising: a constant current generating circuit; an integrating capacitor coupled to said constant current generating circuit for generating a linearly increasing signal; a shorting transistor coupled across said integrating capacitor for first discharging and thence isolating said integrating capacitor to initiate a cycle of linearly increasing signal; a signal level analog switching transistor for providing a reference signal; a reference signal detecting means comprising a reference signal level transistor having a base electrode coupled to said integrating capacitor, an emitter electrode coupled to said signal level analog switching transistor and a collector electrode for comparing said linearly increasing signal with said reference signal level and generating a first of said output pulses when the linearly increasing signal becomes equal to said reference signal; a start pulse amplifying transistor coupled to the collector electrode of said reference signal level transistor for amplifying and passing the first of said output pulses; an input signal receiving means; an input signal level detecting means comprising an input signal level transistor having a base electrode coupled to said integrating capacitor, an emitter electrode coupled to said input signal receiving means and a collector electrode, said input signal level detecting means being operable to generate the second of said output pulses when the linearly increasing signal of said integrating capacitor corresponds to said input signal; and a stop pulse amplifying transistor coupled to the collector electrode of said input signal level transistor for amplifying and passing the second of said output pulses.
Claim 2
Dependent Claim
276 words
High impedance signal detecting apparatus for receiving an input signal and for generating a pair of output pulses having a time interval therebetween corresponding to said input signal, said apparatus comprising: a constant current generating circuit; an integrating capacitor coupled to said constant current generating circuit for generating a linearly increasing signal; a shorting transistor coupled across said integrating capacitor for first discharging and thence isolating said integrating capacitor to initiate a cycle of linearly increasing signal; a signal level analog switching transistor for providing a reference signal; a reference signal detecting means comprising a reference signal level transistor having a base electrode coupled to said integrating capacitor, an emitter electrode coupled to said signal level analog switching transistor and a collector electrode for comparing said linearly increasing signal with said reference signal level and generating a first of said output pulses when the linearly increasing signal becomes equal to said reference signal; a start pulse amplifying transistor coupled to the collector electrode of said reference signal level transistor for amplifying and passing the first of said output pulses; an input signal receiving means; an input signal level detecting means comprising an input signal level transistor having a base electrode coupled to said integrating capacitor, an emitter electrode coupled to said input signal receiving means and a collector electrode, said input signal level detecting means being operable to generate the second of said output pulses when the linearly increasing signal of said integrating capacitor corresponds to said input signal; and a stop pulse amplifying transistor coupled to the collector electrode of said input signal level transistor for amplifying and passing the second of said output pulses.
Claim 3
Dependent Claim
38 words
High impedance signal detecting apparatus in accordance with claim 1 wherein said input signal receiving means comprises an input terminal, a signal storage capacitor, and a resistance element coupled between said input terminal and said signal storage capacitor.
Claim 4
Dependent Claim
47 words
High impedance signal detecting apparatus in accordance with claim 1 further comprising a signal compensating means, said signal compensating means comprising a potentiometer coupled between said start pulse amplifying transistor and said stop pulse amplifying transistor, said potentiometer having an adjustable intermediate contact coupled to ground potential.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |