Patent US3852674A successfully refreshed from Google Patents.
US3852674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parabola and sawtooth generator
Assignee: Philips Broadcast Equipment Corp
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Filing: 1973-08-24
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Granted: 1974-12-03
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Expires: 1993-08-24
Abstract
Abstract An integrator circuit has an operational amplifier with a capacitor in a feedback path. Also in the feedback path is a diode to provide a stable starting D.C. level for the integrator. A second diode can be used for thermal and threshold compensation.
Inventors
- 👤 Roessel F Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:10
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/56; G; G06; G06G; G06G7/00; G06G7/12; G06G7/20; H03K4/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
A circuit for integrating an input voltage in accordance with a keying signal, said circuit comprising a first amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said input voltage and said keying signal, and an output means for supplying a first amplifier signal in accordance with the potential difference between said inputs; a first capacitor coupled between said output and said second input; first means for eliminating the effects of direct current offsets on said circuit comprising a first diode having an anode-cathode voltage drop coupled between said output and said second input; and means for compensating for said voltage drop comprising a second diode series coupled between said first diode and said second input.
Claim 2
Dependent Claim
126 words
A circuit for integrating an input voltage in accordance with a keying signal, said circuit comprising a first amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said input voltage and said keying signal, and an output means for supplying a first amplifier signal in accordance with the potential difference between said inputs; a first capacitor coupled between said output and said second input; first means for eliminating the effects of direct current offsets on said circuit comprising a first diode having an anode-cathode voltage drop coupled between said output and said second input; and means for compensating for said voltage drop comprising a second diode series coupled between said first diode and said second input.
Claim 3
Dependent Claim
15 words
A circuit as claimed in claim 1 wherein said first input is coupled to ground.
Claim 4
Dependent Claim
25 words
A circuit as claimed in claim 1 wherein said diode comprises an anode coupled to said second input and a cathode coupled to said output.
Claim 5
Dependent Claim
29 words
A circuit as claimed in claim 1 further comprising means coupled to said second input for adjusting said input voltage, whereby the waveform of said output voltage is controlled.
Claim 6
Dependent Claim
108 words
A circuit as claimed in claim 1 further comprising a second amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said keying signal and coupled to said first amplifier output for receiving said first amplifier signal, and an output means for supplying a second amplifier signal in accordance with the potential difference between said second amplifier inputs; a second capacitor coupled between said second amplifier output and second input means; and second means for eliminating the effects of direct current offsets on said circuit comprising a third diode coupled between said second amplifier output and second input means.
Claim 7
Dependent Claim
34 words
A circuit as claimed in claim 5 further comprising means coupled to said second amplifier second input for adjusting the voltage applied thereto, whereby the waveform of said second amplifier output voltage is controlled.
Claim 8
Dependent Claim
198 words
A circuit for integrating an input voltage in accordance with a keying signal, said circuit comprising a first amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said input voltage and said keying signal, and an output means for supplying a first amplifier signal in accordance with the potential difference between said inputs; a first capacitor coupled between said output and said second input; first means for eliminating the effects of direct current offsets on said circuit comprising a first diode coupled between said output and said second input, a second amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said keying signal and coupled to said first amplifier output for receiving said first amplifier signal, and an output means for supplying a second amplifier signal in accordance with the potential difference between said second amplifier inputs; a second capacitor coupled between said second amplifier output and second input means; and second means for eliminating the effects of direct current offsets on said circuit comprising a second diode coupled between said second amplifier output and second input means.
Claim 9
Dependent Claim
198 words
A circuit for integrating an input voltage in accordance with a keying signal, said circuit comprising a first amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said input voltage and said keying signal, and an output means for supplying a first amplifier signal in accordance with the potential difference between said inputs; a first capacitor coupled between said output and said second input; first means for eliminating the effects of direct current offsets on said circuit comprising a first diode coupled between said output and said second input, a second amplifier having a non-inverting first input means for receiving a reference potential, an inverting second input means for receiving said keying signal and coupled to said first amplifier output for receiving said first amplifier signal, and an output means for supplying a second amplifier signal in accordance with the potential difference between said second amplifier inputs; a second capacitor coupled between said second amplifier output and second input means; and second means for eliminating the effects of direct current offsets on said circuit comprising a second diode coupled between said second amplifier output and second input means.
Claim 10
Dependent Claim
17 words
A circuit as claimed in claim 7 wherein said first amplifier first input is coupled to ground.
Claim 11
Dependent Claim
30 words
A circuit as claimed in claim 7 wherein said first diode comprises an anode coupled to said first amplifier second input and a cathode coupled to said first amplifier output.
Claim 12
Dependent Claim
34 words
A circuit as claimed in claim 7 further comprising means coupled to said second amplifier second input for adjusting the voltage applied thereto, whereby the waveform of said second amplifier output voltage is controlled.
Claim 13
Dependent Claim
20 words
A circuit as claimed in claim 1 wherein both of said diodes have substantially similar voltage drop versus temperature characteristics.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |