US6285259B1
Expired / Lapsed
US
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System and method for converting from single-ended to differential signals
Assignee: Infineon Technologies AG
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Filing: 1999-04-21
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Granted: 2001-09-04
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Expires: 2019-04-21
Abstract
Abstract The present invention relates to a conversion circuit that converts a single-ended signal to differential signals. According to an embodiment of the present invention, crosstalk is avoided by insuring that none of the transistors in the conversion circuit are directly connected to ground. By not having a transistor directly connected to ground, ground current is avoided and crosstalk associated with ground current is eliminated.
Inventors
- 👤 Stephen J. Franck
- 👤 Zabih Toosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:14
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/345; H03F1/00; H03F1/26; H03F3/26; H03F3/265; H03F2200/00; H03F2200/372; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/45183
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
86 words
A system for converting a single-ended signal to differential signals, comprising: a first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the current is amplified by a gain of more than two; and wherein the first device, the second device, and the third device are connected at a common source.
Claim 2
Independent Claim
86 words
A system for converting a single-ended signal to differential signals, comprising: a first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the current is amplified by a gain of more than two; and wherein the first device, the second device, and the third device are connected at a common source.
Claim 3
Dependent Claim
19 words
The system of claim 1 , wherein the first device, the second device, and the third device are transistors.
Claim 4
Dependent Claim
20 words
The system of claim 1 , wherein the first device, the second device, and the third device are NMOS transistors.
Claim 5
Dependent Claim
16 words
The system of claim 1 , wherein the second and third device are a differential pair.
Claim 6
Dependent Claim
39 words
The system of claim 1 , wherein the first and second device are configured according to a ratio, and wherein the current is amplified by a gain of more than two due at least in part to the ratio.
Claim 7
Dependent Claim
18 words
The system of claim 5 , wherein the first and third device are configured according to the ratio.
Claim 8
Dependent Claim
35 words
The system of claim 5 , wherein the first and second device are transistors and each include a drain, and wherein the ratio is a ratio of the drains of the first and second device.
Claim 9
Dependent Claim
25 words
The system of claim 1 , wherein the first device is connected to a current source via which the first device is coupled to ground.
Claim 10
Dependent Claim
23 words
The system of claim 1 , wherein the first device is coupled to ground via a current source that is connected to ground.
Claim 11
Dependent Claim
24 words
The system of claim 1 , wherein the system is configured to be able to process signals at frequencies up to approximately 200 MHz.
Claim 12
Dependent Claim
13 words
The system of claim 1 , wherein the current is a non-amplified current.
Claim 13
Independent Claim
86 words
A system for converting a single-ended signal to differential signals, comprising: a first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the current is amplified by a gain of more than two; and a fifth device coupled with the second device, wherein the fifth device functions as a cascode device.
Claim 14
Independent Claim
86 words
A system for converting a single-ended signal to differential signals, comprising: a first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the current is amplified by a gain of more than two; and a fifth device coupled with the second device, wherein the fifth device functions as a cascode device.
Claim 15
Dependent Claim
15 words
The system of claim 12 , wherein the fifth device functions as a multiplexing switch.
Claim 16
Dependent Claim
23 words
The system of claim 12 , wherein the first device, the second device, and the third device are connected at a common source.
Claim 17
Dependent Claim
29 words
The system of claim 12 , further comprising a fourth device coupled to the third device, wherein the fourth device acts to balance current gain of the first device.
Claim 18
Dependent Claim
39 words
The system of claim 12 , wherein the first and third device are configured according to a ratio, and wherein the current is amplified by a gain of more than two due at least in part to the ratio.
Claim 19
Independent Claim
86 words
A system for converting a single-ended signal to differential signals, comprising: a first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the current is amplified by a gain of more than two; and a sixth device coupled with the third device, wherein the sixth device functions as a cascode device.
Claim 20
Independent Claim
86 words
A system for converting a single-ended signal to differential signals, comprising: a first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the current is amplified by a gain of more than two; and a sixth device coupled with the third device, wherein the sixth device functions as a cascode device.
Claim 21
Dependent Claim
15 words
The system of claim 17 , wherein the sixth device functions as a multiplexing switch.
Claim 22
Dependent Claim
23 words
The system of claim 17 , wherein the first device, the second device, and the third device are connected at a common source.
Claim 23
Dependent Claim
26 words
The system of claim 17 , further comprising a fourth device coupled to the third device, wherein the fourth device acts to balance the first device.
Claim 24
Dependent Claim
39 words
The system of claim 17 , wherein the first and second device are configured according to a ratio, and wherein the current is amplified by a gain of more than two due at least in part to the ratio.
Claim 25
Independent Claim
93 words
A system for converting a single-ended signal to differential signals, comprising: first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the first, second, and third device are configured to amplify the current by a gain of more than two; and wherein the first device, the second device and the third device are connected at a common source.
Claim 26
Independent Claim
93 words
A system for converting a single-ended signal to differential signals, comprising: first device configured to convert a current to voltage; a second device coupled to the first device; a third device coupled to the first device and second device, wherein not one of the first, second, and third device is directly connected to ground and wherein the first, second, and third device are configured to amplify the current by a gain of more than two; and wherein the first device, the second device and the third device are connected at a common source.
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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) | 2004-09-03 | 2005-03-05 | 2005-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-09-03 | 2009-03-05 | 2009-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-09-03 | 2013-03-05 | 2013-09-04 | $7700.00 | Window Closed / Lapsed |