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A New Tapping Design for Low-Distortion SAW Tapped Delay Lines
Jiro TEMMYO Takahiro INAMURA Isamu KOTAKA Shokichiro YOSHIKAWA
IEICE TRANSACTIONS (1976-1990)
Publication Date: 1979/11/25
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Other Devices
Full Text: PDF(293.4KB)>>
Frequency characteristics of SAW tapped delay lines (TDL's) with equal tap spacing and in-line array are investigated. It is found that reflected SAW echo signals in SAW TLD's cause pulse-like ripples and sharp stopband distortions periodically in the frequency passbands. Tapping design techniques are proposed to remove spurious interference distortion influences on SAW TDL frequency responses. Their applicability is confirmed experimentally. Typical features of a SAW TDL with 101 taps at a 20 MHz bit rate employing 128 rotated Y-cut and X-propagation LiNbO3 substrate are as follows: center frequency is 55.4 MHz, frequency bandwidth is 10 MHz, insertion losses are 3239 dB, and ripples in the passband are about 4 dB.