Patent US5539328A successfully refreshed from Google Patents.
US5539328A
Expired / Lapsed
US
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Termination for high frequency clock distribution path
Assignee: Samsung Electronics Co Ltd
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Filing: 1995-05-24
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Granted: 1996-07-23
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Expires: 2015-05-24
Abstract
Abstract To minimize skew and jitter imposed upon signals communicated along a printed circuit signal path a termination circuit is formed proximate the sink or receiving element of the signals. The termination circuit can be resistive, coupling the signal path to a supply power and to a ground potential.
Inventors
- 👤 Russell N. Mirov
- 👤 Duc N. Le
- 👤 Frank Mikalauskas
- 👤 C. John Grebenkemper
- 👤 Kinying Kwan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:26
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1604; G06F1/00; G06F1/04; G06F1/06; G06F1/10; H; H03; H03L; H03L7/00; G06F11/1608
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
Apparatus for terminating a circuit path that communicates a clock signal to an input of a digital circuit and having a path impedance, there being a supply voltage and a ground potential, the apparatus comprising: a first terminating resistance connecting the input to the supply voltage; and a second terminating resistance connecting the input to the ground potential; wherein the first and second terminating resistance values are substantially equal to the Thevenin equivalent of the path impedance.
Claim 2
Dependent Claim
77 words
Apparatus for terminating a circuit path that communicates a clock signal to an input of a digital circuit and having a path impedance, there being a supply voltage and a ground potential, the apparatus comprising: a first terminating resistance connecting the input to the supply voltage; and a second terminating resistance connecting the input to the ground potential; wherein the first and second terminating resistance values are substantially equal to the Thevenin equivalent of the path impedance.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1, including an isolating resistor coupling the circuit path to the input.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2, wherein the isolating resistor has a resistance value that is large enough to not increase the reflection coefficient of the circuit path.
Claim 5
Dependent Claim
14 words
The apparatus of claim 3, wherein the circuit path is a printed circuit path.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4, wherein the first and second terminating resistances are each approximately 150 ohms.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5, wherein the isolating resistor is approximately 5 ohms.
Claim 8
Dependent Claim
89 words
Apparatus for terminating a circuit path that communicates a clock signal to an input of a digital circuit and having a path impedance, there being a supply voltage and a ground potential, the apparatus comprising: a first terminating resistance coupled between the input and the supply voltage; a second terminating resistance coupled between the input and the ground potential; and an isolating resistor coupling the circuit path to the input; wherein the first and second terminating resistance values are substantially equal to the Thevenin equivalent of the path impedance.
Claim 9
Dependent Claim
89 words
Apparatus for terminating a circuit path that communicates a clock signal to an input of a digital circuit and having a path impedance, there being a supply voltage and a ground potential, the apparatus comprising: a first terminating resistance coupled between the input and the supply voltage; a second terminating resistance coupled between the input and the ground potential; and an isolating resistor coupling the circuit path to the input; wherein the first and second terminating resistance values are substantially equal to the Thevenin equivalent of the path impedance.
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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |