Polar loop transmission circuit has oscillator producing HF signal depending on phase comparison, amplitude modulator, feedback path, amplifier between amplitude modulator, mixer

摘要

The circuit has an input signal generator, HF oscillator controlled by a phase comparison signal, amplitude modulator, feedback path with mixer producing an IF signal, arrangement for producing the amplitude modulated signal by comparing input and IF signal amplitudes, an arrangement for producing the phase comparison signal by comparing input and IF signal phases and an amplifier between the amplitude modulator and mixer with a control input. The circuit has a generator (SSB) providing an input signal, an oscillator (VCO) for producing an HF signal depending on a phase comparison signal, an amplitude modulator (AM), a feedback path (RK) with mixer (M1) producing an intermediate frequency or IF signal (ZF), an arrangement for producing the amplitude modulated signal (AS) by comparing input and IF signal amplitudes, an arrangement for producing the phase comparison signal (PS) by comparing input and IF signal phases and an amplifier (PV) between the amplitude modulator and mixer with a control signal input (S).