| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase shifter capable of generating a local oscillation signal of high frequency, with which a phase difference becomes 90 deg., and a demodulator using the same. SOLUTION: The local oscillation signal of a frequency f/n is sent from a local oscillator 7 to a phase shifter 8. In the phase shifter 8, first of all, two oscillation signals of a phase difference 90/n deg. are generated by all-pass filters 9 and 10 and these oscillation signals are respectively applied to n-multipliers 11 and 12. By multiplying (n) to these oscillation signals with the n-multipliers 11 and 12, the carrier of a frequency (f) and a phase difference 90 deg. is generated and sent to mixers 2 and 3.
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