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A monolithic phase/frequency-locked loop has been developed for operation at up to 50 MHz. The loop combines wide capture range and narrow bandwidth, making it ideal for timing recovery in digital transmission systems. The 24-pin device features an electronically-tuned voltage-controlled LC oscillator and includes the input differentiation and full-wave rectification circuitry required for clock recovery from unipolar nonreturn-to-zero (NRZ) data.
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Cordell et al. (1979) studied this question.
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