US3898447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog arithmetic circuit
Assignee: Honeywell Inc
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Filing: 1974-07-19
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Granted: 1975-08-05
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Expires: 1994-07-19
Abstract
Abstract An analog arithmetic circuit has a modulator circuit for coverting an analog direct current input signal into a variable duty cycle signal with the duty cycle being controlled by the amplitude of the analog input signal. The variable duty cycle signal is subsequently applied to a demodulator circuit. The demodulator circuit is driven by the variable duty cycle signal to produce a switching signal for energizing a second switching device arranged to control the application of a third analog signal to an output circuit. The switching of the second switching device is maintained in phase with the operation of the first switching device to produce an output analog signal having a predetermined relationship to the three input analog signals.
Inventors
- 👤 Jr Theodore B Bozarth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:54
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/161
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
212 words
A signal modulating circuit comprising a signal comparator means having a first input and a second input and arranged to produce an output signal representative of the difference between input signals applied to the first and second inputs, a source of a constant reference signal, signal storage means connected to the second input of said signal comparator means, first circuit means arranged to apply an input signal applied to said signal modulating circuit to said first input of said amplifier means, first switch means for selectively connecting an output signal from said constant reference signal source to said signal storage means, second circuit means arranged to apply said output signal from said first swtich means to said first input of said comparator means concurrently with said input signal, second switch means for selectively discharging said storage means, and switch control means responsive to an output signal from said amplifier means for closing said first switch means in response to a first state of an output signal from said amplifier means while opening said second switch means and for closing said second switch means in response to a second state of said output signal of said amplifier while opening said first switch means, said first and second switch means being alternately operated thereby.
Claim 2
Dependent Claim
212 words
A signal modulating circuit comprising a signal comparator means having a first input and a second input and arranged to produce an output signal representative of the difference between input signals applied to the first and second inputs, a source of a constant reference signal, signal storage means connected to the second input of said signal comparator means, first circuit means arranged to apply an input signal applied to said signal modulating circuit to said first input of said amplifier means, first switch means for selectively connecting an output signal from said constant reference signal source to said signal storage means, second circuit means arranged to apply said output signal from said first swtich means to said first input of said comparator means concurrently with said input signal, second switch means for selectively discharging said storage means, and switch control means responsive to an output signal from said amplifier means for closing said first switch means in response to a first state of an output signal from said amplifier means while opening said second switch means and for closing said second switch means in response to a second state of said output signal of said amplifier while opening said first switch means, said first and second switch means being alternately operated thereby.
Claim 3
Dependent Claim
77 words
A signal modulating circuit as set forth in claim 1 wherein said first and second switch means each include a field effect transistor and said last-mentioned means includes means for applying an output signal from said amplifier to said first switch means to control said field effect transistor therein and signal inverting means for applying an inverted form of said output signal from said amplifier to said second switch means to control said field effect transistor therein.
Claim 4
Dependent Claim
18 words
A signal modulating circuit as set forth in claim 1 wherein said signal storage means is a capacitor.
Claim 5
Dependent Claim
37 words
A signal modulating circuit as set forth in claim 1 an including an output means connected across said signal storage means to provide an output signal indicative of an average signal stored by said signal storage means.
Claim 6
Dependent Claim
35 words
A signal modulating circuit as set forth in claim 4 wherein said output means includes signal isolating means arranged to produce an output signal electrically isolated from said signal stored by said signal storage means.
Claim 7
Dependent Claim
114 words
A signal modulating circuit as set forth in claim 1 and including: a second pair of switch means having a third switch means operated in synchronism with said first switch means and a fourth switch means operated in synchronism with said second switch means, means for applying a second input signal to an input of said third switch means of said second pair of switch means, a second signal storage means, means connecting said second signal storage means to an output of said third switch means of said second pair of switch means, and means connecting said fourth switch means of said second pair of switch means to discharge said second signal storage means.
Claim 8
Dependent Claim
113 words
A signal modulating means as set forth in claim 5 wherein said output means further includes: a signal comparing means for comparing said output signal from said signal isolating means with a predetermined reference signal, a third switch means, a fourth switch means, means for operating said third switch means in synchronism with said first switch means and said fourth switch means in synchronism with said second switch means, a second source of constant reference signal, a second signal storage means, circuit means connecting said third switch means to apply said second signal source to said signal storage means, and means connecting said fourth switch means to discharge said second signal storage means.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |