A process for the frequency synchronization of a free-running, voltage-controlled oscillator of a phaseloocked - loop (pll) - circuit in a radio receiver

摘要

For synchronisation, a radio transmitter transmits, in addition to the useful signals, a synchronising signal in the form of a burst for a short time before each transmission of a useful signal. The burst synchronises a PLL storage circuit (20). The control voltage (UR) occurring during this process for the reference oscillator (25) of the PLL storage circuit (20) is stored and the stored control voltage value synchronises the reference oscillator (25) until the arrival of the next burst. IMAGE