US4937467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complementary circuit and structure with common substrate
Assignee: Fairchild Semiconductor Corp
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Filing: 1989-09-22
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Granted: 1990-06-26
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Expires: 2009-09-22
Abstract
Abstract A circuit in accordance with the invention has a complementary pair of a MISFET and a COMFET with their drains connected together. This allows fabrication on a single substrate for greater reliability and reduced cost. The circuit can be used in a full or one half "H-bridge" configuration for controlling current through a load such as a motor.
Inventors
- 👤 James W. Tuska
- 👤 Lawrence A. Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/80; H10D84/82; H10D84/83; H10D84/85; H10D84/837
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
A circuit for providing a reversible current from first and second power supply terminals in accordance with first and second control signals of opposite logic levels and first and second gate signals of opposite logic levels, said circuit comprising: a motor load having first and second load terminals; first and second vertical COMFETs each having a source coupled to the first power supply terminal, a drain coupled to the first and second load terminals, respectively, and a gate receiving the first and second gate signals respectively; and first and second vertical MISFETs each having a source adapted to be coupled to the second power supply terminal, a drain coupled to said drains of said first and second COMFETs, respectively, and a gate adapted to receive said first and second control signals, respectively.
Claim 2
Dependent Claim
132 words
A circuit for providing a reversible current from first and second power supply terminals in accordance with first and second control signals of opposite logic levels and first and second gate signals of opposite logic levels, said circuit comprising: a motor load having first and second load terminals; first and second vertical COMFETs each having a source coupled to the first power supply terminal, a drain coupled to the first and second load terminals, respectively, and a gate receiving the first and second gate signals respectively; and first and second vertical MISFETs each having a source adapted to be coupled to the second power supply terminal, a drain coupled to said drains of said first and second COMFETs, respectively, and a gate adapted to receive said first and second control signals, respectively.
Claim 3
Dependent Claim
20 words
The circuit of claim 1, wherein each of said COMFET gates is coupled to the drain of the other COMFET.
Claim 4
Dependent Claim
19 words
The circuit of claim 1, wherein said first and second gate signals comprise third and fourth control signals, respectively.
Claim 5
Dependent Claim
21 words
A circuit as claimed in claim 1 further comprising a substrate including at least said first COMFET and said first MISFIT.
Claim 6
Dependent Claim
38 words
A circuit as claimed in claim 1, wherein said MISFETs each comprise an N-channel MISFET, said COMFETs each comprise a P-channel COMFET, and said first power supply terminal has a higher voltage than said second power supply terminal.
Claim 7
Dependent Claim
31 words
A circuit as claimed in claim 1, further comprising a conductor connecting the body of each of said MISFETs and COMFETs to the source of the same MISFET or COMFET, respectively.
Claim 8
Dependent Claim
15 words
A circuit as claimed in claim 1 wherein each of said MISFETs comprise a MOSFET.
Claim 9
Dependent Claim
107 words
A circuit for providing a current from first and second power supply terminals in accordance with first and second control signals of opposite logic levels, said circuit comprising: a motor load having first and second load terminals; a vertical COMFET having a source adapted to be coupled to the first power supply terminal, a drain coupled to the first load terminal, and a gate adapted to receive the first control signal; and a MISFET having a source adapted to be coupled to the second power supply and second load terminals, a drain coupled to said COMFET drain, and a gate adapted to receive the second control signal.
Claim 10
Dependent Claim
107 words
A circuit for providing a current from first and second power supply terminals in accordance with first and second control signals of opposite logic levels, said circuit comprising: a motor load having first and second load terminals; a vertical COMFET having a source adapted to be coupled to the first power supply terminal, a drain coupled to the first load terminal, and a gate adapted to receive the first control signal; and a MISFET having a source adapted to be coupled to the second power supply and second load terminals, a drain coupled to said COMFET drain, and a gate adapted to receive the second control signal.
Claim 11
Dependent Claim
21 words
A circuit as claimed in claim 8 further comprising a substrate including at least said first COMFET and said first MISFIT.
Claim 12
Dependent Claim
21 words
A circuit as claimed in claim 8 wherein said MISFET comprises an N-channel MISFET and said COMFET comprises a P-channel COMFET.
Claim 13
Dependent Claim
13 words
A circuit as claimed in claim 8 wherein said MISFET comprises a MOSFET.
Claim 14
Dependent Claim
30 words
A circuit as claimed in claim 8 further comprising a conductor connecting the body of said MISFET and said COMFET to the source of the same MISFET or COMFET, respectively.
References Cited (Backward Citations)
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |