MULTI-CHANNEL SIGNAL GENERATOR

PURPOSE:To output signal simultaneously plural optional channel signals at an output terminal by phase-locking oscillation frequencies of plural frequency control oscillators with plural different reference frequencies. CONSTITUTION:An output of a phase comparator 23 is controlled in such a way that it can be fetched into respective voltage holding switches 27a, 27b and 27c with signals Sa, Sb and Sc during periods Ta, Tb and Tc, while a other periods fetched signals can be held. Then respective frequency control oscillators 15a, 15b and 15c are clocked by the frequency controlled by oscillation frequencies of reference oscillators 21 and 24. Consequently, when output frequencies f1a, f1b and f1c of the 1st reference oscillator 21 are set by a control processing circuit 28, the oscillation frequencies of the oscillators 15a-15c are regulated in accordance with the set values, and optional channel signals are simultaneously supplied to an output terminal 18.