A Ceramic Filter for 1.544 MHz Timing Extraction in a PCM Carrier System

Takeshi INOUE; Sadayuki TAKAHASHI

A Ceramic Filter for 1.544 MHz Timing Extraction in a PCM Carrier System

Takeshi INOUE, Sadayuki TAKAHASHI

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A 1.544 MHz timing-extraction ceramic filter is examined. This filter has been successfully introduced into a PCM carrier system. Second-order Gaussian approximated effective-parameter theory with gentle frequency-phase inclination characteristics is applied in the circuit design. A ladder transformer filter construction, employing two resonator units and a coupling capacitor, is adopted. A resonator unit, comprising a trapped-energy piezoelectric ceramic strip resonator operating in the width-shear vibration mode and a ceramic capacitor connected in series with the resonator, fulfils the function for easy frequency adjustment and temperature compensation of the resonant frequency. Filter input and output terminating resistances are 30 Ω and 1500 Ω, respectively. The 3 dB fractional bandwidth is 1.07% and the insertion loss at center frequency f₀ is -4.8 dB. The frequency deviation of f₀ is within 200 ppm over a -20 to 60 temperature range and the aging rate of f₀ is about 0.01%/decade. The frequency deviation over the operating temperature range is less than one-third and the aging rate is about one-half of the conventional LC filter used for this application. The filter size is reduced to one-fifth that of the LC filter.

Publication: IEICE TRANSACTIONS on transactions Vol.E68-E No.3 pp.166-172

Publication Date: 1985/03/25

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Type of Manuscript: PAPER

Category: Acoustics

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Takeshi INOUE
Sadayuki TAKAHASHI

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Takeshi INOUE, Sadayuki TAKAHASHI, "A Ceramic Filter for 1.544 MHz Timing Extraction in a PCM Carrier System" in IEICE TRANSACTIONS on transactions, vol. E68-E, no. 3, pp. 166-172, March 1985, doi: .
Abstract: A 1.544 MHz timing-extraction ceramic filter is examined. This filter has been successfully introduced into a PCM carrier system. Second-order Gaussian approximated effective-parameter theory with gentle frequency-phase inclination characteristics is applied in the circuit design. A ladder transformer filter construction, employing two resonator units and a coupling capacitor, is adopted. A resonator unit, comprising a trapped-energy piezoelectric ceramic strip resonator operating in the width-shear vibration mode and a ceramic capacitor connected in series with the resonator, fulfils the function for easy frequency adjustment and temperature compensation of the resonant frequency. Filter input and output terminating resistances are 30 Ω and 1500 Ω, respectively. The 3 dB fractional bandwidth is 1.07% and the insertion loss at center frequency f₀ is -4.8 dB. The frequency deviation of f₀ is within 200 ppm over a -20 to 60 temperature range and the aging rate of f₀ is about 0.01%/decade. The frequency deviation over the operating temperature range is less than one-third and the aging rate is about one-half of the conventional LC filter used for this application. The filter size is reduced to one-fifth that of the LC filter.
URL: https://globals.ieice.org/en_transactions/transactions/10.1587/e68-e_3_166/_p

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@ARTICLE{e68-e_3_166,
author={Takeshi INOUE, Sadayuki TAKAHASHI, },
journal={IEICE TRANSACTIONS on transactions},
title={A Ceramic Filter for 1.544 MHz Timing Extraction in a PCM Carrier System},
year={1985},
volume={E68-E},
number={3},
pages={166-172},
abstract={A 1.544 MHz timing-extraction ceramic filter is examined. This filter has been successfully introduced into a PCM carrier system. Second-order Gaussian approximated effective-parameter theory with gentle frequency-phase inclination characteristics is applied in the circuit design. A ladder transformer filter construction, employing two resonator units and a coupling capacitor, is adopted. A resonator unit, comprising a trapped-energy piezoelectric ceramic strip resonator operating in the width-shear vibration mode and a ceramic capacitor connected in series with the resonator, fulfils the function for easy frequency adjustment and temperature compensation of the resonant frequency. Filter input and output terminating resistances are 30 Ω and 1500 Ω, respectively. The 3 dB fractional bandwidth is 1.07% and the insertion loss at center frequency f₀ is -4.8 dB. The frequency deviation of f₀ is within 200 ppm over a -20 to 60 temperature range and the aging rate of f₀ is about 0.01%/decade. The frequency deviation over the operating temperature range is less than one-third and the aging rate is about one-half of the conventional LC filter used for this application. The filter size is reduced to one-fifth that of the LC filter.},
keywords={},
doi={},
ISSN={},
month={March},}

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TY - JOUR
TI - A Ceramic Filter for 1.544 MHz Timing Extraction in a PCM Carrier System
T2 - IEICE TRANSACTIONS on transactions
SP - 166
EP - 172
AU - Takeshi INOUE
AU - Sadayuki TAKAHASHI
PY - 1985
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E68-E
IS - 3
JA - IEICE TRANSACTIONS on transactions
Y1 - March 1985
AB - A 1.544 MHz timing-extraction ceramic filter is examined. This filter has been successfully introduced into a PCM carrier system. Second-order Gaussian approximated effective-parameter theory with gentle frequency-phase inclination characteristics is applied in the circuit design. A ladder transformer filter construction, employing two resonator units and a coupling capacitor, is adopted. A resonator unit, comprising a trapped-energy piezoelectric ceramic strip resonator operating in the width-shear vibration mode and a ceramic capacitor connected in series with the resonator, fulfils the function for easy frequency adjustment and temperature compensation of the resonant frequency. Filter input and output terminating resistances are 30 Ω and 1500 Ω, respectively. The 3 dB fractional bandwidth is 1.07% and the insertion loss at center frequency f₀ is -4.8 dB. The frequency deviation of f₀ is within 200 ppm over a -20 to 60 temperature range and the aging rate of f₀ is about 0.01%/decade. The frequency deviation over the operating temperature range is less than one-third and the aging rate is about one-half of the conventional LC filter used for this application. The filter size is reduced to one-fifth that of the LC filter.
ER -