| 摘要 |
PURPOSE:To obtain the receiver with simple configuration, less number of components, compact size and less power consumption. CONSTITUTION:A local oscillator 17 and a carrier signal oscillator are made up of one PLL circuit. The PLL circuit consists of a 1st frequency divider 17a frequency-dividing an oscillation signal of a reference oscillator 20, a variable oscillator 17e supplying a local oscillation signal to a mixer 7, a 2nd frequency divider 17b frequency-dividing its oscillation signal, and a phase comparator 17c comparing the frequency division outputs of the 1st and 2nd frequency dividers 17a, 17b. Furthermore, the oscillating frequency of the variable oscillator 17e is controlled by the phase comparison output. Moreover, the receiver is provided with a phase shifter 19 receiving the frequency division output from the 1st or 2nd frequency divider 17a or 17b, generating carrier signals whose frequency is equal to a frequency of an intermediate frequency signal and whose phases are 0 deg. and 90 deg. and supplying the carrier signals whose frequency is equal to a frequency of an intermediate frequency signal and whose phases are 0 deg. and 90 deg. to an orthogonal detector 10. |
