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US5226004A
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Surface acoustic wave filter device
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1991-10-23
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Granted: 1993-07-06
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Expires: 2011-10-23
Abstract
Abstract A surface acoustic wave filter device includes a plurality of surface acoustic wave convolvers each having an output electrode between two input transducers, one of the input transducers of each convolver receiving a reference signal through a respective matching circuit. The other input transducer of one of the convolvers receives an input signal through a matching circuit, and the other input transducer of the rest of the convolvers receives through a respective input matching circuit and low pass filter from a respective mixing circuit a mixture of the reference signal and a respective output signal received from the output of a respective output matching circuit having an input coupled to the output electrode of a respective convolver. The remaining convolver has an output electrode coupled to a further output matching circuit. In one embodiment, a low pass filter receives from a mixing circuit a mixture of the reference signal and the output from the further output matching circuit. In a variation, the output of the further output matching circuit is connected to a detecting circuit.
Inventors
- 👤 Syuichi Mitsutsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:57
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
262 words
A surface acoustic wave filter device comprising: surface acoustic wave (SAW) convolver means which includes a plurality m of SAW convolvers each having first and second input transducers and having an output electrode disposed between said input transducers; a first input matching circuit and a plurality (m-1) of second input matching circuits each having an output coupled to the first input transducer on a respective one of said convolvers, and a plurality m of third input matching circuits each having an output coupled to the second input transducer on a respective one of said convolvers, an input signal being applied to an input of said first input matching circuit; a first output matching circuit and a plurality (m-1) of second output matching circuits each having an input coupled to the output electrode on a respective one of said convolvers; a reference signal generator for supplying a reference signal to an input of each of said third input matching circuits; a plurality (m-1) of first mixers which each mix an output of a respective one of said second output matching circuits and said reference signal, and a plurality (m-1) of first low pass filters, each having an input coupled with an output of a respective one of said first mixers, and each having an output coupled to an input of a respective one of said second input matching circuits; a second mixer for mixing the output of said first output matching circuit and said reference signal; and a second low pass filter having an input coupled to an output of said second mixer.
Claim 2
Dependent Claim
262 words
A surface acoustic wave filter device comprising: surface acoustic wave (SAW) convolver means which includes a plurality m of SAW convolvers each having first and second input transducers and having an output electrode disposed between said input transducers; a first input matching circuit and a plurality (m-1) of second input matching circuits each having an output coupled to the first input transducer on a respective one of said convolvers, and a plurality m of third input matching circuits each having an output coupled to the second input transducer on a respective one of said convolvers, an input signal being applied to an input of said first input matching circuit; a first output matching circuit and a plurality (m-1) of second output matching circuits each having an input coupled to the output electrode on a respective one of said convolvers; a reference signal generator for supplying a reference signal to an input of each of said third input matching circuits; a plurality (m-1) of first mixers which each mix an output of a respective one of said second output matching circuits and said reference signal, and a plurality (m-1) of first low pass filters, each having an input coupled with an output of a respective one of said first mixers, and each having an output coupled to an input of a respective one of said second input matching circuits; a second mixer for mixing the output of said first output matching circuit and said reference signal; and a second low pass filter having an input coupled to an output of said second mixer.
Claim 3
Dependent Claim
56 words
A surface acoustic wave filter device according to claim 1, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein a frequency domain matched by each said output matching circuit is 2f L to 2f H .
Claim 4
Dependent Claim
56 words
A surface acoustic wave filter device according to claim 1, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein said reference signal has a frequency f r defined by f L ≦f r ≦f H .
Claim 5
Dependent Claim
56 words
A surface acoustic wave filter device according to claim 1, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein each of said first low pass filters has a cut-off frequency equal to said f H .
Claim 6
Dependent Claim
77 words
A surface acousic wave filter device according to claim 1, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein the output electrodes of two of said SAW convolvers have lengths of L 1 and L 2 , respectively, where 0.68 L 1 ≦L 2 ≦0.76 L 1 or 1.32 L 1 ≦L 2 ≦1.46 L 1 .
Claim 7
Dependent Claim
245 words
A surface acoustic wave filter device comprising: surface acoustic wave (SAW) convolver means which includes a plurality m of SAW convolvers each having first and second input transducers and having an output electrode disposed between said input transducers; a first input matching circuit and a plurality (m-1) of second input matching circuits each having an output coupled to the frist input transducer on a respective one of said convolvers, and a plurality m of third input matching circuits each having an output coupled to the second input transducer on a respective one of said convolvers, an input signal being applied to an input of said first input matching circuit; a first output matching circuit and a plurality (m-1) of second output matching circuits each having an input coupled to the output electrode on a respective one of said convolvers; a reference signal generator for supplying a reference signal to an input of each of said third input matching circuits; a plurality (m-1) of first mixers which each mix an output of a respective one of said second output matching circuits and said reference signal, and a plurality (m-1) of first low pass filters each having an input coupled with an output of a respective one of said first mixers, and each having an output coupled to an input of a respective one of said second input matching circuits; and a detecting circuit having an input coupled to an output of said first output matching circuit.
Claim 8
Dependent Claim
245 words
A surface acoustic wave filter device comprising: surface acoustic wave (SAW) convolver means which includes a plurality m of SAW convolvers each having first and second input transducers and having an output electrode disposed between said input transducers; a first input matching circuit and a plurality (m-1) of second input matching circuits each having an output coupled to the frist input transducer on a respective one of said convolvers, and a plurality m of third input matching circuits each having an output coupled to the second input transducer on a respective one of said convolvers, an input signal being applied to an input of said first input matching circuit; a first output matching circuit and a plurality (m-1) of second output matching circuits each having an input coupled to the output electrode on a respective one of said convolvers; a reference signal generator for supplying a reference signal to an input of each of said third input matching circuits; a plurality (m-1) of first mixers which each mix an output of a respective one of said second output matching circuits and said reference signal, and a plurality (m-1) of first low pass filters each having an input coupled with an output of a respective one of said first mixers, and each having an output coupled to an input of a respective one of said second input matching circuits; and a detecting circuit having an input coupled to an output of said first output matching circuit.
Claim 9
Dependent Claim
56 words
A surface acoustic wave filter device according to claim 6, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein a frequency domain matched by each said output matching circuit is 2f L to 2f H .
Claim 10
Dependent Claim
56 words
A surface acoustic wave filter device according to claim 6, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein said reference signal has a frequency f r defined by f L ≦f r ≦f H .
Claim 11
Dependent Claim
56 words
A surface acoustic wave filter device according to claim 6, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein each of said first low pass filters has a cut-off frequency equal to said f H .
Claim 12
Dependent Claim
77 words
A surface acoustic wave filter device according to claim 6, wherein each of said SAW convolvers has a frequency pass band bounded by a lower limit frequency f L and an upper limit frequency f H , and wherein the output electrodes of two of said SAW convolvers have lengths of L 1 and L 2 , respectively, where 0.68 L 1 ≦L 2 ≦0.76 L 1 or 1.32 L 1 ≦L 2 ≦1.46 L 1 .
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) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |