Jitter detection apparatus using double-PLL structure

Details Jitter detection apparatus using double-PLL structure Jitter detection apparatus using double-PLL structure

1995-06-14

1996-10-08

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

327156, 331 11, H03D 324

Patent

active

055639216

ABSTRACT:
A target signal input to a mixer circuit of a frequency converter is frequency-converted to have a low frequency by a signal obtained by frequency-multiplying an output signal from the voltage-controlled crystal oscillator by M. The frequency-converted output is compared with the output signal from the voltage-controlled crystal oscillator by a phase/frequency comparator. A loop filter receives an error signal based on the phase/frequency comparison and performs loop control to lock the phase of the output signal from the voltage-controlled crystal oscillator to the phase of the output signal from the frequency converter. The jitter component of the target signal exhibiting phase variations at a frequency higher than a loop band contained in the error signal is output from a jitter detection filter before the loop filter via a branching circuit. Even if the target signal having a high frequency undergoes a great frequency change, stable, accurate jitter measurements can be performed following the change.

REFERENCES:
patent: 4158857 (1979-06-01), Hiraguri
patent: 4225828 (1980-09-01), Watanabe et al.
patent: 4412299 (1983-10-01), Huffman
patent: 5146186 (1992-09-01), Vella
patent: 5254955 (1993-10-01), Saeki et al.
patent: 5259007 (1993-11-01), Yamamoto
"Error Rate Jitter Measuring Equipment ME520A/B"; Anritsu Technical, No. 52 Sep. 1986; pp. 40-50.
"Sony CXB1112Q" Phase Frequency Detector with Differential I/O; pp. 5-30 - 5-31.

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