Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-08-20
1989-01-17
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313D, 333150, 364821, H01L 4108, H03H 930
Patent
active
047989882
ABSTRACT:
An optimum bias circuit for a convolver according to this invention searches automatically a bias voltage, which makes the convolution efficiency of a surface acoustic wave convolver highest and applies it to the gate electrode of the convolver. It consists of an impedance bridge consisting of a plurality of fixed impedances, a reference impedance, and an impedance constituted by the gate electrode of the convolver, a signal source for the impedance bridge, an amplifier amplifying the output of the bridge, a differential amplifier amplifying the signal for the bridge, a phase detector, a DC amplifier and an integrating circuit, and is so constructed that the phase detector detects the phase of the output of the bridge (amplified signal) by using the output of the differential amplifier as a reference signal; the DC amplifier amplifies the output after the phase detection; the integrator integrates the output of the DC amplifier; and the output of the integrator is applied to the gate electrode of the convolver.
REFERENCES:
patent: 3975696 (1976-08-01), Kantorowicz
patent: 4037174 (1977-07-01), Moore
patent: 4194171 (1980-03-01), Jelks
patent: 4388599 (1983-06-01), Gautier et al.
patent: 4448805 (1984-05-01), Lewis
patent: 4473767 (1984-09-01), Minagawa et al.
patent: 4600853 (1986-07-01), Whitlock et al.
MZOS-FET-TYPE Convolver, by K. Matsumots et al, 1980 Ultrasonics Symposium (IEEE), pp. 129-132.
Budd Mark O.
Clarion Co. Ltd.
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