Patent US3805170A successfully refreshed from Google Patents.
US3805170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transition detector
Assignee: United States Department of the Navy
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Filing: 1969-01-03
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Granted: 1974-04-16
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Expires: 1989-01-03
Abstract
Abstract A transition detector to detect slopes in an analog input signal and produce digital outputs in response to whether or not such slopes are present. An analog signal is fed through a differentiating network and combined with a current source as the input to an operational amplifier that has a zener diode in the feedback system.
Inventors
- 👤 G Dusheck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:34
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/25; G01; G01R; G01R1/00; G01R1/30; G01V; G01V3/00; G01V3/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
213 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal comprising: an operational amplifier having at least an inverting and a noninverting input; a substantially unilateral impedance operatively connected at one end thereof to said inverting input of said operational amplifier and at the other end thereof to the output of said operational amplifier; differentiator means including a first capacitor in series relation with a first resistor connected to said inverting input of said operational amplifier for differentiating the received analog signals; and input bias circuit means operatively connected to said inverting input and polarized to receive and accommodate voltage potential of a predetermined polarity for providing a bias current and said input bias circuit means further includes a second resistor receiving said voltage potential, a variable resistor means for providing preselectable threshold levels, said variable resistor means includes a variable resistor operatively connected to said first and said second resistors, and a second capacitor grounded at one end thereof and operatively connected at its other end to said second resistor and said variable resistor, whereby said operational amplifier provides a high digital output signal when the analog signal differentiated by said differentiating means cancels the bias current produced by said bias circuit means.
Claim 2
Dependent Claim
213 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal comprising: an operational amplifier having at least an inverting and a noninverting input; a substantially unilateral impedance operatively connected at one end thereof to said inverting input of said operational amplifier and at the other end thereof to the output of said operational amplifier; differentiator means including a first capacitor in series relation with a first resistor connected to said inverting input of said operational amplifier for differentiating the received analog signals; and input bias circuit means operatively connected to said inverting input and polarized to receive and accommodate voltage potential of a predetermined polarity for providing a bias current and said input bias circuit means further includes a second resistor receiving said voltage potential, a variable resistor means for providing preselectable threshold levels, said variable resistor means includes a variable resistor operatively connected to said first and said second resistors, and a second capacitor grounded at one end thereof and operatively connected at its other end to said second resistor and said variable resistor, whereby said operational amplifier provides a high digital output signal when the analog signal differentiated by said differentiating means cancels the bias current produced by said bias circuit means.
Claim 3
Dependent Claim
76 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal according to claim 1 further comprising: first means connecTed to the output of said operational amplifier for limiting the positive output swing thereof; and second means connected at one end thereof to said first means and at the other end thereof to said substantially unilateral impedance means for limiting the negative output swing of said operational amplifier.
Claim 4
Dependent Claim
76 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal according to claim 2 further comprising: a first decoupling network connected to an input of said operational amplifier; and a second decoupling network connected to another input of said operational amplifier, said first decoupling network adapted to receive a negative voltage operating potential and said second decoupling network adapted to receive a like positive operating voltage potential.
Claim 5
Dependent Claim
55 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal according to claim 3 further comprising: voltage balancing means operatively connected to said operational amplifier for balancing the voltage offset thereof; and a phase compensation network connected to said voltage balancing means and said operational amplifier.
Claim 6
Dependent Claim
61 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal according to claim 4 wherein: said substantially unilateral impedance means comprises a zener diode, the anode of which is connected to said inverting input of said operational amplifier and the cathode of which is connected to the output of said operational amplifier.
Claim 7
Dependent Claim
41 words
A circuit for providing a digital output signal in response to detecting a transition in a received analog signal according to claim 5 wherein: said voltage balancing means comprises a resistor circuit; and said phase compensation network comprises a resistor-capacitor circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |