US3836907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital to analog converter
Assignee: Forbro Design Corp
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Filing: 1973-03-21
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Granted: 1974-09-17
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Expires: 1993-03-21
Abstract
Abstract Complementary BCD or binary input signals are transferred through isolating optical couplers to storage. Strobing for storage selects network switches to provide an analog voltage corresponding to the digital input. Two independent outputs are provided through repeater amplifiers. One output may be divided by 10 or 20 under signal control. The entire converter is powered from the AC line. Isolation between input and output is maintained up to 1000 volts. The converter is intended for use as a programming voltage for a voltage or current regulated power supply.
Inventors
- 👤 S Nercessian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/66; H03M1/74
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
80 words
In a digital to analog converter, the combination of: means for receiving in parallel, complementary digital data signals; means for inverting said signals; means for isolating said signals comprising a plurality of optical couplers; strobe responsive means for storing said isolated signals; means for strobing said storing means to store said signals; means for converting said stored signals to analog signals in accordance with the input data signals; and means for coupling said analog signals to an output utilization means.
Claim 2
Dependent Claim
80 words
In a digital to analog converter, the combination of: means for receiving in parallel, complementary digital data signals; means for inverting said signals; means for isolating said signals comprising a plurality of optical couplers; strobe responsive means for storing said isolated signals; means for strobing said storing means to store said signals; means for converting said stored signals to analog signals in accordance with the input data signals; and means for coupling said analog signals to an output utilization means.
Claim 3
Dependent Claim
21 words
A digital to analog converter as set forth in claim 1: wherein said strobing means includes an optical coupler isolation means.
Claim 4
Dependent Claim
20 words
A digital to analog converter as set forth in claim 1: wherein said strobing means includes strobe signal delay means.
Claim 5
Dependent Claim
33 words
A digital to analog converter as set forth in claim 1, and including: means responsive to the turn-on condition of said utilization means for generating a strobe signal for resetting said storing means.
Claim 6
Dependent Claim
19 words
A digital to analog converter as set forth in claim 1: wherein said isolating means includes optical coupling means.
Claim 7
Dependent Claim
24 words
A digital to analog converter as set forth in claim 1: wherein said output utilization means is a voltage programmable voltage regulated power supply.
Claim 8
Dependent Claim
24 words
A digital to analog converter as set forth in claim 1: wherein said output utilization means is a voltage programmable current regulated power supply.
Claim 9
Dependent Claim
20 words
A digital to analog converter as set forth in claim 1: wherein said coupling means includes an operational repeater amplifier.
Claim 10
Dependent Claim
20 words
A digital to analog converter as set forth in claim 1: wherein said coupling means includes a predetermined ratio attenuator.
Claim 11
Dependent Claim
33 words
A digital to analog converter as set forth in claim 1: wherein said coupling means includes a predetermined ratio attenuator and said output utilization means is a voltage programmable current regulated power supply.
Claim 12
Dependent Claim
112 words
In a digital to analog converter, the combination of: a source of digital data in parallel form to be converted to analog form; a plurality of strobe responsive storage means each capable of storing one bit of digital data; a plurality of isolating optical couplers connected in series between said source of parallel data and said storage means for applying said data to said storage; a source of strobe pulses coupled to said storage means for entering said applied data in said storage means; digital to analog converter means coupled to said storage means for converting the digital data stored therein to analog form; and means for utilizing said analog form data.
Claim 13
Dependent Claim
112 words
In a digital to analog converter, the combination of: a source of digital data in parallel form to be converted to analog form; a plurality of strobe responsive storage means each capable of storing one bit of digital data; a plurality of isolating optical couplers connected in series between said source of parallel data and said storage means for applying said data to said storage; a source of strobe pulses coupled to said storage means for entering said applied data in said storage means; digital to analog converter means coupled to said storage means for converting the digital data stored therein to analog form; and means for utilizing said analog form data.
Claim 14
Dependent Claim
61 words
A digital to analog converter as set forth in claim 11: wherein said source of digital data includes contact means which disconnects said source from said converter; and wherein the polarity of the converter between said contact means and said utilization means is such that when said contact means is open circuited, the utilization means receives analog zero from said converter.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |