US3751681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory selection apparatus
Assignee: Honeywell Inc
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Filing: 1970-12-07
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Granted: 1973-08-07
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Expires: 1990-12-07
Abstract
Abstract Electronic selection circuits for operating coincident-current magnetic memories, and like apparatus, are provided for construction essentially entirely as integrated circuits, even the output drive stages. The circuits are arranged to transform ground referenced input signals to output signals for driving floating reactances without the transformers required in the prior art for voltage isolation. Further, the new circuits drive these reactive loads without excessive power dissipation or excessive transient voltages.
Inventors
- 👤 W Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:23
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/04; G05B19/05; G05B19/058; G06; G06F; G06F11/00; G06F11/002; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; H; H03; H03K; H03K19/00; H03K19/003; H03K19/01; H03K19/013
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
263 words
A monolithic integrated circuit formed in a single block of semiconductor material, said circuit comprising: 1. conductive means formed in said single block of semiconductor material and including at least two input terminals, an output terminal, and a supply terminal, 2. an output transistor formed in said single block of semiconductor material and having its emitter-collector path serially connected betwen said output terminal and said supply terminal, 3. semiconductor impedance transforming means formed in said single block of semiconductor material and having an input lead and an output lead, said output lead connected with the base of said output transistor, 4. semiconductor coincidence means formed in said single block of semiconductor material and having input leads coupled to said input terminals and an output lead coupled to said input lead of said transforming means, said semiconductor coincidence means in response to signals applied to said input terminals enabling said transforming means and controlling the emittercontroller conduction of said output transistor, 5. semiconductor feedback means formed in said single block of semiconductor material and receiving a feedback signal corresponding to the signal at at least one terminal selected from said output terminal and said supply terminal, said semiconductor feedback means responsive to said feedback signal for applying a selective overdrive signal to said transforming means for accelerating the switching operation of said output transistor, and 6. impedance means including a resistor and diode having its anode connection distributed along said resistor, said impedance means coupled to said semiconductor feedback means and said output transistor for damping inductive kick during switching of said output transistor.
Claim 2
Dependent Claim
263 words
A monolithic integrated circuit formed in a single block of semiconductor material, said circuit comprising: 1. conductive means formed in said single block of semiconductor material and including at least two input terminals, an output terminal, and a supply terminal, 2. an output transistor formed in said single block of semiconductor material and having its emitter-collector path serially connected betwen said output terminal and said supply terminal, 3. semiconductor impedance transforming means formed in said single block of semiconductor material and having an input lead and an output lead, said output lead connected with the base of said output transistor, 4. semiconductor coincidence means formed in said single block of semiconductor material and having input leads coupled to said input terminals and an output lead coupled to said input lead of said transforming means, said semiconductor coincidence means in response to signals applied to said input terminals enabling said transforming means and controlling the emittercontroller conduction of said output transistor, 5. semiconductor feedback means formed in said single block of semiconductor material and receiving a feedback signal corresponding to the signal at at least one terminal selected from said output terminal and said supply terminal, said semiconductor feedback means responsive to said feedback signal for applying a selective overdrive signal to said transforming means for accelerating the switching operation of said output transistor, and 6. impedance means including a resistor and diode having its anode connection distributed along said resistor, said impedance means coupled to said semiconductor feedback means and said output transistor for damping inductive kick during switching of said output transistor.
Claim 3
Dependent Claim
59 words
A circuit as defined in claim 1 wherein said semiconductor impedance means includes a first transistor having its base as an input lead and a second transistor having its emitter as an output lead, said first transistor when conductive enabling said second transistor, said second transistor when conductive providing an enabling input to said base of said output transistor.
Claim 4
Dependent Claim
26 words
an output transistor formed in said single block of semiconductor material and having its emitter-collector path serially connected betwen said output terminal and said supply terminal,
Claim 5
Dependent Claim
26 words
an output transistor formed in said single block of semiconductor material and having its emitter-collector path serially connected betwen said output terminal and said supply terminal,
Claim 6
Dependent Claim
32 words
semiconductor impedance transforming means formed in said single block of semiconductor material and having an input lead and an output lead, said output lead connected with the base of said output transistor,
Claim 7
Dependent Claim
32 words
semiconductor impedance transforming means formed in said single block of semiconductor material and having an input lead and an output lead, said output lead connected with the base of said output transistor,
Claim 8
Dependent Claim
58 words
A circuit as defined in claim 2 wherein said semiconductor coincidence means includes a third transistor having multiple emitters and a collector, said multiple emitters coupled to said input terminal, said collector coupled to said base of said first transistor, said third transistor in response to signals applied to said input terminals enabling said first transistor to conduction.
Claim 9
Dependent Claim
70 words
A circuit as defined in claim 3 wherein said semiconductor feedback means includes a fourth transistor having a base and an emitter, said base coupled to said supply terminal, said emitter coupled to said impedance means and to the collector of said first transistor, said fourth transistor when conductive applying a selective overdrive signal to said collector of said first transistor for accelerating the switching operation of said output transistor.
Claim 10
Dependent Claim
59 words
semiconductor coincidence means formed in said single block of semiconductor material and having input leads coupled to said input terminals and an output lead coupled to said input lead of said transforming means, said semiconductor coincidence means in response to signals applied to said input terminals enabling said transforming means and controlling the emitter-controller conduction of said output transistor,
Claim 11
Dependent Claim
59 words
semiconductor coincidence means formed in said single block of semiconductor material and having input leads coupled to said input terminals and an output lead coupled to said input lead of said transforming means, said semiconductor coincidence means in response to signals applied to said input terminals enabling said transforming means and controlling the emitter-controller conduction of said output transistor,
Claim 12
Dependent Claim
63 words
semiconductor feedback means formed in said single block of semiconductor material and receiving a feedback signal corresponding to the signal at at least one terminal selected from said output terminal and said supply terminal, said semiconductor feedback means responsive to said feedback signal for applying a selective overdrive signal to said transforming means for accelerating the switching operation of said output transistor, and
Claim 13
Dependent Claim
63 words
semiconductor feedback means formed in said single block of semiconductor material and receiving a feedback signal corresponding to the signal at at least one terminal selected from said output terminal and said supply terminal, said semiconductor feedback means responsive to said feedback signal for applying a selective overdrive signal to said transforming means for accelerating the switching operation of said output transistor, and
Claim 14
Dependent Claim
38 words
impedance means including a resistor and diode having its anode connection distributed along said resistor, said impedance means coupled to said semiconductor feedback means and said output transistor for damping inductive kick during switching of said output transistor.
Claim 15
Dependent Claim
38 words
impedance means including a resistor and diode having its anode connection distributed along said resistor, said impedance means coupled to said semiconductor feedback means and said output transistor for damping inductive kick during switching of said output transistor.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |