Electrical computers: arithmetic processing and calculating – Electrical analog calculating computer – Particular function performed
Patent
1997-11-26
2000-04-04
Mai, Tan V.
Electrical computers: arithmetic processing and calculating
Electrical analog calculating computer
Particular function performed
310313R, G06G 712, H01L 4140
Patent
active
060473061
ABSTRACT:
A surface acoustic wave signal processing apparatus for processing first and second high-frequency signals having frequencies f.sub.1 and f.sub.2 respectively, which comprises: first and second surface acoustic wave delay elements for receiving the first and second high-frequency signals respectively and independently of each other, the delay elements being formed as surface acoustic wave excitation and reception transducers on a piezoelectric substrate so that a phase delay .phi..sub.1 with respect to the frequency f.sub.1 is substantially equal to a phase delay .phi..sub.2 with respect to the frequency f.sub.2 (that is, .phi..sub.1 .apprxeq..phi..sub.2); and a mixer for mixing first and second high-frequency output signals of the first and second surface acoustic wave delay elements so that a signal having a frequency .vertline.f.sub.1 -f.sub.2 .vertline. which is a difference between the two frequencies f.sub.1 and f.sub.2 is taken out as an output signal of the mixer.
REFERENCES:
patent: 4021657 (1977-05-01), Auld
patent: 5434893 (1995-07-01), Le Roy et al.
Hikita Mitsutaka
Sakiyama Kazuyuki
Shibagaki Nobuhiko
Takubo Chisaki
Hitachi , Ltd.
Mai Tan V.
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