| 摘要 |
PURPOSE:To prevent the deterioration of characteristics due to imcompleteness, by constituting the circuit handling analog amount with the phase shift circuit, replacing the analog switch into the digital gate circuit, omitting the analog delay line and simplifying the circuit constitution. CONSTITUTION:The input signal is in phase detection at the orthogonal detector 1 to constitute the signals P, Q in orthogonal relation, the signals P, Q are fed to the adders 42-48 and the subtractors 49-55, and signals S7-S20 are obtained with addition or subtraction at the amplitude ratio. Further, the signals S7-S20 are shaped and identified with the identifiers 69-82 to obtain the binary digital signal. After multi plied for this digitized pair signal at the EX-OR circuits 83-89, it is input to the gate circuit 90, where selects the output of the circuits 83-89 with the control signals X1-X7 from the A/D converter 68, and the outputs are constituted into the output of the circuit 90 at the OR circuit 98. The logic between the circuit 90 and the output of the EX-OR circuit 28 is taken at the EX-OR circuit 29 to control the phase of the voltage controlled oscillator 31, and the output of the oscillator 31 is fed to the detector 1. |
