Surface acoustic wave apparatus with a variable amplitude-freque

Details Surface acoustic wave apparatus with a variable amplitude-freque Surface acoustic wave apparatus with a variable amplitude-freque

1982-09-27

1984-10-30

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313R, 333150, 333196, H03H 964, H03H 942

Patent

active

044802374

ABSTRACT:
A surface acoustic wave apparatus comprises a surface acoustic wave element having one input electrode to which an input signal is supplied and two output electrodes, a variable gain element connected to the one output electrode, and an adder for adding the output of the variable gain element and the output of the other output electrode. The phase characteristic and the delay time characteristic of a filter determined by the input electrode and the one output electrode are the same as those of a filter determined by the input electrode and the other output electrode, respectively. Therefore, even if the amplitude-frequency characteristic of the adder varies, the phase characteristics and delay time are kept constant.

REFERENCES:
patent: 3582840 (1971-06-01), De Vries

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