US5808550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power and modulation circuit for a remotely-pollable electronic tag
Assignee: Winstead Assets Ltd
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Filing: 1996-11-27
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Granted: 1998-09-15
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Expires: 2016-11-27
Abstract
Abstract A power and modulation circuit, notably for a passive remotely-pollable electronic tag is provided, the circuit having a coil for picking up an inductive field and modulating it, circuitry being provided whereby circuits of the tag can be continuously powered while the inductive field is being modulated.
Inventors
- 👤 Pierre Raimbault
- 👤 Jean Goupil
- 👤 Aderito Rodrigue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:46
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/0723
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
A power and modulation circuit, suitable for use in conjunction with a remotely-polled tag, comprising: coil means; a capacitor, a first terminal of said capacitor is connected to a first terminal of said coil means; first switching means provided between a second terminal of said coil means and a second terminal of said capacitor for constituting a parallel LC circuit providing modulation when said first switching means are closed; and a circuit for rectifying a voltage in said coil means, for providing a supply voltage, connected to the second terminal of said coil means and to the second terminal of said capacitor.
Claim 2
Dependent Claim
102 words
A power and modulation circuit, suitable for use in conjunction with a remotely-polled tag, comprising: coil means; a capacitor, a first terminal of said capacitor is connected to a first terminal of said coil means; first switching means provided between a second terminal of said coil means and a second terminal of said capacitor for constituting a parallel LC circuit providing modulation when said first switching means are closed; and a circuit for rectifying a voltage in said coil means, for providing a supply voltage, connected to the second terminal of said coil means and to the second terminal of said capacitor.
Claim 3
Dependent Claim
23 words
The power and modulation circuit according to claim 1, wherein said rectifying circuit includes second switching means capable of being opened for modulation.
Claim 4
Dependent Claim
30 words
The power and modulation circuit according to claim 1 further comprising rectifying means connected across the terminals of said coil means, and active when said first switching means are closed.
Claim 5
Dependent Claim
30 words
The power and modulation circuit according to claim 2 further comprising rectifying means connected across the terminals of said coil means, and active when said first switching means are closed.
Claim 6
Dependent Claim
98 words
A power and modulation circuit, suitable for use in conjunction with a remotely-pollable tag, comprising: coil means for picking up an inductive field and modulating said field; means for constituting a series resonant LC circuit with said coil means in the absence of modulation; means for constituting a parallel resonant LC circuit with said coil means for modulating said inductive field; means for rectifying a voltage induced by said inductive field in said coil means for providing a power supply voltage, wherein the series resonant LC circuit and the parallel resonant LC circuit have a same resonant frequency.
Claim 7
Dependent Claim
98 words
A power and modulation circuit, suitable for use in conjunction with a remotely-pollable tag, comprising: coil means for picking up an inductive field and modulating said field; means for constituting a series resonant LC circuit with said coil means in the absence of modulation; means for constituting a parallel resonant LC circuit with said coil means for modulating said inductive field; means for rectifying a voltage induced by said inductive field in said coil means for providing a power supply voltage, wherein the series resonant LC circuit and the parallel resonant LC circuit have a same resonant frequency.
Claim 8
Dependent Claim
20 words
The power and modulation circuit according to claim 5, wherein said resonant frequency is a frequency of said inductive field.
Claim 9
Dependent Claim
33 words
The power and modulation circuit according to claim 5, wherein said means for constituting a series resonant LC circuit and said means for constituting a parallel resonant LC circuit comprise a common capacitor.
Claim 10
Dependent Claim
47 words
The power and modulation circuit according to claim 5, wherein the means for rectifying an induced voltage comprise first rectifying means connected across the terminals of said series resonant LC circuit formed by said means for constituting a series resonant LC circuit in the absence of modulation.
Claim 11
Dependent Claim
18 words
The power and modulation circuit according to claim 8, wherein said rectifying means comprise a voltage doubler circuit.
Claim 12
Dependent Claim
47 words
The power and modulation circuit according to claim 5, wherein the means for rectifying an induced voltage comprise second rectifying means connected across the terminals of said parallel resonant LC circuit formed by the means for constituting a parallel resonant LC circuit for modulating said inductive field.
Claim 13
Dependent Claim
18 words
The power and modulation circuit according to claim 10, wherein said rectifying means comprise a voltage doubler circuit.
Claim 14
Dependent Claim
105 words
A power and modulation circuit, suitable for use in conjunction with a remotely-pollable tag, comprising: coil means for picking up an inductive field and modulating said field; means for constituting a series resonant LC circuit with said coil means in the absence of modulation; means for constituting a parallel resonant LC circuit with said coil means for modulating said inductive field; means for rectifying a voltage induced by said inductive field in said coil means for providing a power supply voltage, wherein said means for constituting a series resonant LC circuit and said means force constituting a parallel resonant LC circuit comprise a common capacitor.
Claim 15
Dependent Claim
105 words
A power and modulation circuit, suitable for use in conjunction with a remotely-pollable tag, comprising: coil means for picking up an inductive field and modulating said field; means for constituting a series resonant LC circuit with said coil means in the absence of modulation; means for constituting a parallel resonant LC circuit with said coil means for modulating said inductive field; means for rectifying a voltage induced by said inductive field in said coil means for providing a power supply voltage, wherein said means for constituting a series resonant LC circuit and said means force constituting a parallel resonant LC circuit comprise a common capacitor.
Claim 16
Dependent Claim
26 words
The power and modulation circuit according to claim 12, wherein the series resonant LC circuit and the parallel resonant LC circuit have a same resonant frequency.
Claim 17
Dependent Claim
20 words
The power and modulation circuit according to claim 13, wherein said resonant frequency is a frequency of said inductive field.
Claim 18
Dependent Claim
47 words
The power and modulation circuit according to claim 12, wherein the means for rectifying an induced voltage comprise first rectifying means connected across the terminals of said series resonant LC circuit formed by said means for constituting a series resonant LC circuit in the absence of modulation.
Claim 19
Dependent Claim
18 words
The power and modulation circuit according to claim 15, wherein said rectifying means comprise a voltage doubler circuit.
Claim 20
Dependent Claim
47 words
The power and modulation circuit according to claim 12, wherein the means for rectifying an induced voltage comprise second rectifying means connected across the terminals of said parallel resonant LC circuit formed by the means for constituting a parallel resonant LC circuit for modulating said inductive field.
Claim 21
Dependent Claim
18 words
The power and modulation circuit according to claim 17, wherein said rectifying means comprise a voltage doubler circuit.
Claim 22
Dependent Claim
20 words
A remotely-pollable tag provided with a power and modulation circuit according to at least one of claims 1-4 and 5-18.
References Cited (Backward Citations)
US4196418A
Cited
EP0242906A1
Cited
US5105190A
Cited
US5103222A
Cited
EP0405695A1
Cited
US5471196A
Cited
EP0592224A1
Cited
US5317330A
Cited
WO1995000922A1
Cited
US5491468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |