US4694201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current-saving CMOS input buffer
Assignee: Motorola Solutions Inc
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Filing: 1985-04-30
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Granted: 1987-09-15
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Expires: 2005-04-30
Abstract
Abstract A current-saving CMOS signal input buffer is provided, having at least two CMOS output transistors (each having an input) connected in complementary fashion with a common output taken therebetween, complementary current mirrors coupled to the output transistor inputs, an input signal capacitively coupled to at least one of the output transistor inputs, a reference impedance coupled between the complementary current mirrors, and isolation impedances coupled between the complementary current mirrors and the output transistor inputs.
Inventors
- 👤 Barry L. Jason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:19
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/0175; H03K19/0185; H03K19/018507; H03K19/018521
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
A current saving CMOS signal buffer comprising: input means for receiving an input signal; output means for providing an output signal; at least two CMOS output transistors connected in a push-pull configuration between a supply voltage differential comprising a positive supply voltge and a negative supply voltage said CMOS output transistors having their gates connected in common to said input means and wherein a common output between said transistors connects to said output means; means coupled to said two CMOS output transistors forming first and second current mirrors for providing a source of substantially constant current mirrored to said output transistors; and such that current flows through said output transistors to increase substantially linearly as said supply voltage differential increases linearly.
Claim 2
Dependent Claim
121 words
A current saving CMOS signal buffer comprising: input means for receiving an input signal; output means for providing an output signal; at least two CMOS output transistors connected in a push-pull configuration between a supply voltage differential comprising a positive supply voltge and a negative supply voltage said CMOS output transistors having their gates connected in common to said input means and wherein a common output between said transistors connects to said output means; means coupled to said two CMOS output transistors forming first and second current mirrors for providing a source of substantially constant current mirrored to said output transistors; and such that current flows through said output transistors to increase substantially linearly as said supply voltage differential increases linearly.
Claim 3
Dependent Claim
17 words
The buffer of claim 1 wherein an impedance is coupled between said first and second current mirrors.
Claim 4
Dependent Claim
30 words
The buffer of claim 1 and further including isolation means for providing an impedance between said means for providing a source of substantially constant current means and said output transistors.
Claim 5
Dependent Claim
27 words
The buffer of claim 3 wherein: said isolation means includes first and second transistors coupled between said first and second current mirrors and said output transistors, respectively.
Claim 6
Dependent Claim
22 words
The buffer of claim 1 and further including a capacitor coupled between said input means and only one of said output transistors.
References Cited (Backward Citations)
US3631528A
Cited
DE2502697A1
Cited
US4042839A
Cited
US4038607A
Cited
US4071783A
Cited
US4219743A
Cited
WO1981001781A1
Cited
US4412139A
Cited
US4477735A
Cited
JPS57166738A
Cited
JPS57212827A
Cited
US4443715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |