Transceiver system having phase and frequency detector and method thereof

摘要

A transceiver system having a phase and frequency locked architecture is described. The transceiver system includes a clock and data recovery type receiver, a frequency divider and a transmitter. The clock and data recovery type receiver receives an external signal from a host unit and extracts the external signal to generate a clock signal and a data signal. The frequency divider is used to divide the frequency of the clock signal for generating a reference clock signal. The transmitter transmits output data content based on the reference clock signal.

主权项

1. A transceiver system coupled to a host unit, the transceiver system comprising:
a clock/data recovery type receiver, receiving an external signal from the host unit and extracting the external signal for generating a clock signal and a data signal; a dividing unit coupled to the clock/data recovery type receiver, performing frequency division of the clock signal for generating a reference clock; a transmitter coupled to the dividing unit, transmitting output data content to the host unit based on the reference clock; and an encoding/decoding device coupled between the dividing unit and the transmitter, encoding and decoding the data signal based on the reference clock; wherein the clock/data recovery type receiver further comprises:
a comparing unit, sampling the external signal based on a sampling frequency for generating the data signal and a sampling signal;a phase detector coupled to the comparing unit, detecting a phase variation between a first voltage-controlled oscillation signal and the sampling signal for generating a first phase difference signal, and detecting a phase variation between a second voltage-controlled oscillation signal and the sampling signal for generating a second phase difference signal;a frequency detector coupled to the phase detector, detecting a frequency of the first phase difference signal for generating a first frequency difference signal, and detecting a frequency of the second phase difference signal for generating a second frequency difference signal;a voltage-controlled oscillator, generating the first voltage-controlled oscillation signal and generating the second voltage-controlled oscillation signal when the frequency detector adjusts the frequency of the voltage-controlled oscillator based on the first frequency difference signal, wherein one of the first voltage-controlled oscillation signal and the second voltage-controlled oscillation signal is equalized to a transmitted frequency of the external signal based on the first frequency difference signal and the second frequency difference signal; anda switching unit, switching one of the frequency detector and the phase detector to be electrically connected to the voltage-controlled oscillator.