US4449059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triangle waveform generator having a loop delay compensation network
Assignee: Tektronix Inc
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Filing: 1981-07-13
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Granted: 1984-05-15
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Expires: 2001-07-13
Abstract
Abstract A triangle waveform generator is provided with a compensation network to eliminate the effects of frequency and amplitude errors caused by switching-control loop delays of the system. This is achieved by causing early switching of an amplitude-limit sensing detector so that the generated triangle waveform reverses polarity at the correct level. The compensation network may be implemented to accommodate independent ramp rates.
Inventors
- 👤 E. Jon Dickes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:19
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A triangle waveform generator, comprising: (a) means for generating positive-slope and negative-slope ramp waveforms; (b) means for controlling the ramp rates of said waveform; (c) means for establishing predetermined amplitude limits of said waveforms; (d) means coupled to said ramp rate control means and said amplitude-limit establishment means for generating sense voltages which are within said amplitude limits by a predetermined time related factor, wherein said means for generating sense voltages comprises at least one compensation network having a predetermined multiplication constant coupled between said ramp-rate control means and said amplitude-limit establishment means; (e) means for detecting when said ramp waveforms reach said sense voltages and for generating control signals in response thereto; and (f) means connected to said ramp waveform generating means and being responsive to said control signals for switching the polarity of slope of said ramp waveforms.
Claim 2
Dependent Claim
140 words
A triangle waveform generator, comprising: (a) means for generating positive-slope and negative-slope ramp waveforms; (b) means for controlling the ramp rates of said waveform; (c) means for establishing predetermined amplitude limits of said waveforms; (d) means coupled to said ramp rate control means and said amplitude-limit establishment means for generating sense voltages which are within said amplitude limits by a predetermined time related factor, wherein said means for generating sense voltages comprises at least one compensation network having a predetermined multiplication constant coupled between said ramp-rate control means and said amplitude-limit establishment means; (e) means for detecting when said ramp waveforms reach said sense voltages and for generating control signals in response thereto; and (f) means connected to said ramp waveform generating means and being responsive to said control signals for switching the polarity of slope of said ramp waveforms.
Claim 3
Dependent Claim
41 words
A triangle waveform generator in accordance with claim 1 wherein said ramp waveform generating means comprises a capacitive element and current generating means coupled thereto for selectively conducting current into and out of said capacitive element to generate ramp voltages thereby.
Claim 4
Dependent Claim
21 words
A triangle waveform generator in accordance with claim 2 wherein said current generating means comprises a pair of variable current generators.
Claim 5
Dependent Claim
45 words
A triangle waveform generator in accordance with claim 1 wherein said ramp waveform generating means comprises a capacitive element and a pair of variable current generators coupled thereto, and said ramp-rate control means comprises means for varying the levels of current in said current generators.
Claim 6
Dependent Claim
33 words
A triangle waveform generator in accordance with claim 4 wherein said variable current generators comprise voltage-to-current converters and said ramp-rate control means comprises means for applying independent control voltages to said voltage-to-current converters.
Claim 7
Dependent Claim
38 words
A triangle waveform generator in accordance with claim 1 wherein said detection means includes a comparator having a first input coupled to said ramp waveform generating means and a second input coupled to said sense voltage generating means.
Claim 8
Dependent Claim
161 words
A triangle waveform generator, comprising: (a) means for generating positive-slope and negative-slope ramp waveforms; (b) means for controlling the ramp rates of said waveforms; (c) means for establishing predetermined amplitude limits of said waveforms, said amplitude-limit establishing means comprising means for generating independently controllable upper and lower amplitude limit reference voltages; (d) means coupled to said ramp rate control means and said amplitude-limit establishment means for generating sense voltages which are within said amplitude limits by a predetermined time-related factor, said sense voltage generating means comprising a pair of networks for independently reducing said upper and lower amplitude sense limit voltages in accordance with the respective ramp rates of said positive-slope and negative-slope ramp waveforms; (e) means for detecting when said ramp waveforms reach said sense voltages and for generating control signals in response thereto; and (f) means connected to said ramp waveform generating means and being responsive to said control signals for switching the polarity of slope of said waveforms.
Claim 9
Dependent Claim
161 words
A triangle waveform generator, comprising: (a) means for generating positive-slope and negative-slope ramp waveforms; (b) means for controlling the ramp rates of said waveforms; (c) means for establishing predetermined amplitude limits of said waveforms, said amplitude-limit establishing means comprising means for generating independently controllable upper and lower amplitude limit reference voltages; (d) means coupled to said ramp rate control means and said amplitude-limit establishment means for generating sense voltages which are within said amplitude limits by a predetermined time-related factor, said sense voltage generating means comprising a pair of networks for independently reducing said upper and lower amplitude sense limit voltages in accordance with the respective ramp rates of said positive-slope and negative-slope ramp waveforms; (e) means for detecting when said ramp waveforms reach said sense voltages and for generating control signals in response thereto; and (f) means connected to said ramp waveform generating means and being responsive to said control signals for switching the polarity of slope of said waveforms.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |