ref at port r of the mixer unit 10 the mixer unit 10 receives an rf signal from the voltage controlled oscillator vco 12 at port l the reference signal and the rf signal are combined in mixer unit 10 and are applied by means of port i to the noninverting input terminal of the loop amplifier 12 a feedback loop is arranged from the output terminal of the loop amplifier 12 to the inverting input terminal of the amplifier the present circuit is an example of a wide band locked loop amplifier apparatus which has a fast acquisition and lock up time but has inherent phase delays in the lock up loop referring now to fig2 there is shown a schematic diagram of a wide band phase locked loop amplifier apparatus utilizing a signal splitting unit 20 to receive the input reference signal ref a first output port 22 applies the input reference signal to the input port 26 of mixer unit 28 the signal at the output port 30 of mixer unit 28 is applied to the noninverting input terminal 32 of the loop amplifier operation amplifier op 27 the feedback network from the output of the loop amplifier op 27 to the inverting input terminal 34 operates in conjunction with the amplifier to perform the integration function the output from the loop amplifier op 27 is applied through the low pass filter which is comprised of resistor r1 and capacitor c1 to the input port 36 of mixer unit 38 the.