| 摘要 |
PURPOSE: To attain the stable phase control by means of a simple circuit by detecting the phase difference between the input and output signals of a transfer means and then feeding the feedback value decided based on the detected phase difference back to the transfer means. CONSTITUTION: The continuous basic waves outputted from the emitter of a transistor Tr2 are converted into the digital signals B of '1' and '2' by a capacitor C3, a resistor R8 and an inverting amplifier 2 and then inputted to a phase comparator 3. A digital signal A that is not transmitted yet through a BPF 1 is also inputted to the comparator 3 and undergoes the comparison of phase with the signal outputted from the amplifier 2. The comparator 3 outputs a phase error signal that undergone the phase comparison to a filter circuit 6 that is used for a feedback loop. In such a constitution, a negative feedback loop is formed so that the reference signal A is compared with the signal B that undergone the phase control and that a fixed phase error is secured between both signals A and B. As a result, the phase control stability is extremely improved. |
