Timing extraction circuit
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United States of America Patent
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Apr 5, 1988
Grant Date -
N/A
app pub date -
Dec 10, 1984
filing date -
Dec 16, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A regenerator for an undersea optical transmission system has a timing extraction circuit for extracting the clock signal from an NRZ PCM signal. The circuit comprises a surface acoustic wave filter (F) which feeds an amplifier which comprises a number of similar cascaded amplifier sections provided by an integrated circuit. The first stage is a grounded base stage (stage 1) and the following sections each include a balanced emitter-follower buffer stage (stage 2) and a balanced long-tailed pair stage (stage 3). Any base and emitter voltages in an amplifier section are minimised if not eliminated by the long-tailed pair having equal emitter and collector loads.
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