US3676697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sweep and gate generator
Assignee: Litton Marine Systems Inc
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Filing: 1970-10-23
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Granted: 1972-07-11
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Expires: 1990-10-23
Abstract
Abstract A variable frequency sawtooth generator contains a high input impedance integrating amplifier driven through a resistance network from a bistable multivibrator and an adjustable voltage divider energized from a steady DC source. The multivibrator is driven into a first stable state by an externally generated trigger pulse and into a second stable state when the output voltage from the amplifier exceeds a predetermined threshold value. In the latter state, the voltage from the multivibrator balances out the voltage from the DC source and a diode shunted around the amplifier clamps the amplifier input and output circuits together. When the multivibrator is subsequently driven into the first stable state, the voltage from the multivibrator is blocked by a series diode so that only the voltage derived from the DC source is applied to the amplifier. The diode shunted around the amplifier is back-biased under these conditions and a voltage appears at the output of the amplifier which increases at a steady rate determined by the selected magnitude of the adjustable voltage.
Inventors
- 👤 Arthur B Davenport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:20
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
340 words
A sweep and gate generator comprising: range selector means including an adjustable resistance voltage divider, a source of steady DC voltage connected across said voltage divider, a high input impedance inverting and integrating amplifier having a pair of input terminals, said pair of input terminals including a first input terminal and a second grounded input terminal, said amplifier further having output terminal means, means in said range selector means for applying a selected constant portion of said DC voltage to said amplifier, said portion having a negative polarity, said means including a series resistor coupled between said voltage divider and said first input terminal, bistable multivibrator means, said multivibrator means having SET and RESET terminals arranged so that a voltage pulse applied to said SET terminal drives the multivibrator out of said first bistable state and a voltage pulse applied to said RESET terminal drives the multivibrator into said first bistable state, said multivibrator providing a positive output voltage when in its first bistable state, network means responsive to the bistable state of said multivibrator for balancing out said selected portion of DC voltage when and only when said multivibrator is in said first bistable state, said network means including a first diode connected between said first input terminal and the output terminal means on said amplifier, said first diode being oriented to block current flow when said first input terminal is at a negative potential, said network means further including a second diode and a coupling resistor serially connected between the output of said multivibrator and said first input terminal, said second diode being oriented to conduct current to said first input terminal only when said multivibrator is in its first bistable state, means responsive to an externally generated trigger pulse for driving said multivibrator means out of said first bistable state and RESET means including a voltage sensitive zener diode for passing a signal from the output terminal means of said amplifier to said RESET terminal when the voltage output of said amplifier exceeds a predetermined threshold value.
Claim 2
Dependent Claim
340 words
A sweep and gate generator comprising: range selector means including an adjustable resistance voltage divider, a source of steady DC voltage connected across said voltage divider, a high input impedance inverting and integrating amplifier having a pair of input terminals, said pair of input terminals including a first input terminal and a second grounded input terminal, said amplifier further having output terminal means, means in said range selector means for applying a selected constant portion of said DC voltage to said amplifier, said portion having a negative polarity, said means including a series resistor coupled between said voltage divider and said first input terminal, bistable multivibrator means, said multivibrator means having SET and RESET terminals arranged so that a voltage pulse applied to said SET terminal drives the multivibrator out of said first bistable state and a voltage pulse applied to said RESET terminal drives the multivibrator into said first bistable state, said multivibrator providing a positive output voltage when in its first bistable state, network means responsive to the bistable state of said multivibrator for balancing out said selected portion of DC voltage when and only when said multivibrator is in said first bistable state, said network means including a first diode connected between said first input terminal and the output terminal means on said amplifier, said first diode being oriented to block current flow when said first input terminal is at a negative potential, said network means further including a second diode and a coupling resistor serially connected between the output of said multivibrator and said first input terminal, said second diode being oriented to conduct current to said first input terminal only when said multivibrator is in its first bistable state, means responsive to an externally generated trigger pulse for driving said multivibrator means out of said first bistable state and RESET means including a voltage sensitive zener diode for passing a signal from the output terminal means of said amplifier to said RESET terminal when the voltage output of said amplifier exceeds a predetermined threshold value.
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |