A plurality of windows is provided to accommodate jitters in a clock with respect to a reference clock.

Network delay is determined in order to synchronize a clock in a mobile station with a reference clock.

A local clock network (10, 12) has a reference control unit (16a, 16b) having a reference clock, processing unit and data memory.

An LSI (10) of a host device (1) separately generates a transmission clock (TC1) and a reception clock (RC1) in accordance with a reference clock (RFC1).

  The reference clock (RFC2) is converted into a differential clock, which is transmitted to the sub device (2).

A system and method for calibrating a local radio reference clock (50) for a radio (50) operating in a radio network having a network reference clock.

An apparatus (21) is provided for recovering a reference clock generated by a master clock (22) in a sender (20).

The invention operates independently from any outside system reference clock.

A reference clock generates a reference clock signal and a local oscillator (LO) generates a LO signal based on the reference clock signal.

  A PLL circuit (4) supplies a reference clock (CLK1) to the DAC (3).

To achieve this, a calibration circuit (8), which determines the pulse ratio between the internal clock pulse (3) and the reference clock pulse (7), is provided.

Said controller comprises a PLL unit (PLL) for generating different clock phases (clk, clk90, clkl80) from a reference clock (ref clk).

A frequency comparator compares the frequency of a reference clock with that of an output clock and outputs a frequency comparison signal.

The DVB receiver is configured to use a reference clock of the portable electronic device as a DVB reference clock.

  An LSI (20) of the sub device (2) separately generates a transmission clock (TC2) and a reception clock (RC2) in accordance with a reference clock (RFC3) converted from the differential clock.