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US5491484A
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Electronic transponder tuning circuitry
Assignee: Texas Instruments Inc
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Filing: 1994-12-22
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Granted: 1996-02-13
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Expires: 2014-12-22
Abstract
Abstract A method is disclosed herein for tuning a responder unit (12). The method comprises the stops of storing energy in a responder unit energy accumulator (136) in a contactless fashion by RF energy transmitted from the interrogator unit (10) to the responder unit (12), and exciting within the responder unit (12) an RF carrier wave. The method further comprises the stops of transmitting the RF carrier wave in a first response from the responder unit (12) to the interrogator unit (10) and measuring within the interrogator unit (10) the received signal strength of the RF carrier wave of the first response. In further accordance with the invention tuning data may be transmitted to the responder unit (12) by sending at least one RF programming sequence from the interrogator unit (10) to the responder unit (12). The responder unit (12) upon receiving the RF programming sequence from the interrogator unit (10) would preferably modify an internally stored frequency setting within a memory (244) of the responder unit (12) in response to the first set of data. Other devices, systems and methods are also disclosed.
Inventors
- 👤 Josef H. Schuermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:58
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G06K19/077; G06K19/07749; G06K19/07773; G06K19/07777; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/753; G01S13/758; G01S13/82; G01S13/825; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4008; G06K19/0701; G06K19/0723; G06K19/0726
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
94 words
An interrogator that transmits at least one RF interrogation pulse followed by at least one RF programming sequence containing tuning data to a responder, which is operable to transmit an RF response upon receipt of said at least one RF interrogation pulse, said interrogator comprising: a) a detection circuit for detecting the strength of a carrier wave generated by said responder, and b) a control circuit for analyzing the detected strength of said carrier wave and for determining if a new set of tuning data for another RF programming sequence needs to be computed.
Claim 2
Dependent Claim
94 words
An interrogator that transmits at least one RF interrogation pulse followed by at least one RF programming sequence containing tuning data to a responder, which is operable to transmit an RF response upon receipt of said at least one RF interrogation pulse, said interrogator comprising: a) a detection circuit for detecting the strength of a carrier wave generated by said responder, and b) a control circuit for analyzing the detected strength of said carrier wave and for determining if a new set of tuning data for another RF programming sequence needs to be computed.
Claim 3
Dependent Claim
35 words
The interrogator of claim 1 wherein said detection circuit comprises a pick-up coil that is loosely coupled to said resonant circuit of said responder unit for detecting the signal strength of said RF carrier wave.
Claim 4
Dependent Claim
19 words
The interrogator of claim 1 and further comprising an antenna operable to receive said RF response from said responder.
Claim 5
Dependent Claim
21 words
The interrogator of claim 3 wherein said detection circuit measures the signal strength of said RF response received at said antenna.
Claim 6
Dependent Claim
22 words
The interrogator of claim 4 and further comprising a demodulator for receiving said RF response from said antenna and demodulating data therefrom.
Claim 7
Dependent Claim
14 words
The interrogator of claim 5 wherein said demodulator and said detection circuit are integrated.
Claim 8
Dependent Claim
19 words
The interrogator of claim 6 wherein said integrated demodulator and detection circuit provides a radio signal strength indicator signal.
Claim 9
Dependent Claim
28 words
The interrogator of claim 7 wherein said radio signal strength indicator signal is an analog signal indicating the signal strength of said RF response received at said antenna.
Claim 10
Dependent Claim
60 words
The interrogator of claim 7 and further comprising an analog-to-digital converter electrically interposed between said detection circuit and said control circuit, said analog-to-digital converter being operable to create a digital signal representing the amplitude of said analog signal whereby said control circuit may directly determine whether a new set of tuning data for another RF programming sequence should be computed.
Claim 11
Dependent Claim
21 words
The interrogator of claim 1 and further comprising a memory for storing information representing the detected strength of said carrier wave.
Claim 12
Dependent Claim
40 words
The interrogator of claim 10 wherein said control circuit is operable to compare the detected signal strength of a first wireless response, as represented by information stored in said memory, to the detected signal strength of a second wireless response.
Claim 13
Dependent Claim
134 words
An interrogator that transmits at least one RF interrogation pulse followed by at least one RF programming sequence containing tuning data to a responder, which is operable to transmit an RF response upon receipt of said at least one RF interrogation pulse, said interrogator comprising: a) an antenna operable to receive said RF response from said responder; b) a detection circuit for detecting the strength at said antenna of a carrier wave generated by said responder and for providing an analog signal to said control circuit, said analog signal indicating the signal strength of said RF response received at said antenna; and c) a control circuit for analyzing the detected strength of said carrier wave and for determining if a new set of tuning data for another RF programming sequence needs to be computed.
Claim 14
Dependent Claim
134 words
An interrogator that transmits at least one RF interrogation pulse followed by at least one RF programming sequence containing tuning data to a responder, which is operable to transmit an RF response upon receipt of said at least one RF interrogation pulse, said interrogator comprising: a) an antenna operable to receive said RF response from said responder; b) a detection circuit for detecting the strength at said antenna of a carrier wave generated by said responder and for providing an analog signal to said control circuit, said analog signal indicating the signal strength of said RF response received at said antenna; and c) a control circuit for analyzing the detected strength of said carrier wave and for determining if a new set of tuning data for another RF programming sequence needs to be computed.
Claim 15
Dependent Claim
22 words
The interrogator of claim 12 and further comprising a demodulator for receiving said RF response from said antenna and demodulating data therefrom.
Claim 16
Dependent Claim
14 words
The interrogator of claim 13 wherein said demodulator and said detection circuit are integrated.
Claim 17
Dependent Claim
60 words
The interrogator of claim 12 and further comprising an analog-to-digital converter electrically interposed between said detection circuit and said control circuit, said analog-to-digital converter being operable to create a digital signal representing the amplitude of said analog signal whereby said control circuit may directly determine whether a new set of tuning data for another RF programming sequence should be computed.
Claim 18
Dependent Claim
207 words
An interrogator that transmits at least one RF interrogation pulse followed by at least one RF programming sequence containing tuning data to a responder, which is operable to transmit an RF response upon receipt of said at least one RF interrogation pulse, said interrogator comprising: a) an antenna operable to receive said RF response from said responder; b) a detection circuit for detecting the strength at said antenna of a carrier wave generated by said responder and for providing an analog signal to said control circuit, said analog signal indicating the signal strength of said RF response received at said antenna; c) a demodulator for receiving said RF response from said antenna and demodulating data therefrom; d) a control circuit for analyzing the detected strength of said carrier wave and for determining if a new set of tuning data for another RF programming sequence needs to be computed; and e) an analog-to-digital converter electrically interposed between said detection circuit and said control circuit, said analog-to-digital converter being operable to create a digital signal representing the amplitude of said analog signal whereby said control circuit may directly determine whether a new set of tuning data for another RF programming sequence should be computed based upon said digital signal.
Claim 19
Dependent Claim
207 words
An interrogator that transmits at least one RF interrogation pulse followed by at least one RF programming sequence containing tuning data to a responder, which is operable to transmit an RF response upon receipt of said at least one RF interrogation pulse, said interrogator comprising: a) an antenna operable to receive said RF response from said responder; b) a detection circuit for detecting the strength at said antenna of a carrier wave generated by said responder and for providing an analog signal to said control circuit, said analog signal indicating the signal strength of said RF response received at said antenna; c) a demodulator for receiving said RF response from said antenna and demodulating data therefrom; d) a control circuit for analyzing the detected strength of said carrier wave and for determining if a new set of tuning data for another RF programming sequence needs to be computed; and e) an analog-to-digital converter electrically interposed between said detection circuit and said control circuit, said analog-to-digital converter being operable to create a digital signal representing the amplitude of said analog signal whereby said control circuit may directly determine whether a new set of tuning data for another RF programming sequence should be computed based upon said digital signal.
Claim 20
Dependent Claim
14 words
The interrogator of claim 16 wherein said demodulator and said detection circuit are integrated.
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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) | 1999-02-12 | 1999-08-14 | 2000-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-12 | 2003-08-14 | 2004-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-12 | 2007-08-14 | 2008-02-13 | $7700.00 | Window Closed / Lapsed |