High power acoustic wave arrangement with N.sup.2 parallel-series connected acoustic wave devices
First Claim
1. An acoustic wave device arrangement comprising at least one piezo-electric substrate including N2 acoustic wave devices in which at the same operating frequency each of the devices have substantially the same electrical impedance and transfer characteristics, where N is an integer greater than unity, each device having at least one pair of terminals for coupling power into and out of said device, said N2 devices being electrically connected in a parallel-series arrangement comprising N groups each of which comprises N of said devices with the corresponding pairs of terminals being electrically connected in series, the corresponding pairs of terminals in each group being electrically connected in parallel with the corresponding pairs of terminals in the other group or groups whereby at said operating frequency the device arrangement has substantially the same electrical impedance and transfer characteristics as each of the individual N2 devices.
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Accused Products
Abstract
N2 acoustic wave devices (A,B,S,T; where N is an integer greater than unity) with substantially the same electrical impedance and transfer characteristics at a given operating frequency are electrically connected in a parallel-series arrangement which has substantially the same electrical impedance and transfer characteristics as any one of the individual N2 devices, but an increased active device area. The increased active area reduces stress and alleviates acoustically-induced migration in the metal of, for example, transducer electrode fingers (6,7) of resonators at high power levels. The parallel-series arrangement consists of N groups, each of which comprises N devices (A,B or S,T), the corresponding pairs of terminals (4,54 and 54,55) of which are connected in series. Some terminals (54 or 55) may be common to two or more devices and some devices may have merged transducers in which the electrode fingers (6 or 7) of one transducer are a longitudinal extension of the fingers of a parallel transducer. In the case of multi-port devices the input and output terminal pairs may be differently grouped as regards the individual devices to which they belong.
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Citations
17 Claims
- 1. An acoustic wave device arrangement comprising at least one piezo-electric substrate including N2 acoustic wave devices in which at the same operating frequency each of the devices have substantially the same electrical impedance and transfer characteristics, where N is an integer greater than unity, each device having at least one pair of terminals for coupling power into and out of said device, said N2 devices being electrically connected in a parallel-series arrangement comprising N groups each of which comprises N of said devices with the corresponding pairs of terminals being electrically connected in series, the corresponding pairs of terminals in each group being electrically connected in parallel with the corresponding pairs of terminals in the other group or groups whereby at said operating frequency the device arrangement has substantially the same electrical impedance and transfer characteristics as each of the individual N2 devices.
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7. An acoustic wave device arrangement comprising at least one piezo-electric substrate including N2 acoustic wave devices for which at the same operating frequency all N2 devices have substantially the same electrical impedance and transfer characteristics, where N is an integer greater than unity,
each device having at least first and second pairs of terminals for coupling power into and out of said device, said N2 devices being electrically connected in a parallel-series arrangement comprising N parallel-groups of which: -
the first terminals of the N2 devices are grouped in N groups each of which comprises N serially-connected pairs of terminals, the second terminals are grouped in N groups each of which comprises N serially-connected pairs of terminals, and all the pairs of second terminals within each of the N groups belong to a group of N devices all the pairs of first terminals of which also belong to a common N group of the first terminals, the device arrangement thereby having substantially the same electrical impedance and transfer characteristics as each of the individual acoustic wave devices. - View Dependent Claims (16)
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8. An accoustic wave device arrangement comprising at least one piezo-electric substrate including N2 acoustic wave devices in which for a given operating frequency all of the devices have substantially the same electrical impedance and transfer characteristics, where N is an integer greater than unity,
each device having at least first and second pairs of terminals for coupling power into and out of said device, said N2 devices being electrically connected in a parallel-series arrangement comprising N parallel groups of which: -
the first terminals of the N2 devices are grouped in N groups each of which comprises N serially-connected pairs of terminals, the second terminals are grouped in N groups each of which comprises N serially-connected pairs of terminals, and the pairs of second terminals within each of the N groups belong to a group of N devices the pairs of first terminals of which do not belong to a common N group of the first terminals, whereby the device arrangement has substantially the same electrical impedance and transfer characteristics as each of the individual N2 devices. - View Dependent Claims (17)
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10. An acoustic wave resonator arrangement comprising at least one piezo-electric substrate including N2 acoustic wave resonator devices wherein at a given operating frequency all of the N2 devices have substantially the same electrical impedance and transfer characteristics, where N is an integer greater than unity,
each device having a resonance cavity defined in the substrate and at least one pair of terminals for coupling power into and out of said device, said N2 devices being electrically connected in a parallel-series arrangement comprising N groups each of which comprise N of said devices the corresponding pairs of terminals of which are electrically connected in series, the corresponding pairs of terminals in each group being electrically connected in parallel with the corresponding pairs of terminals in the other group or groups whereby the device arrangement has substantially the same electrical impedance and transfer characteristics as each of the individual N2 devices.
Specification