| 摘要 |
PURPOSE:To obtain the high-accuracy oscillation frequency by oscillating the double frequency of the high frequency band required for the transmission and reception by means of the variable divider and the local oscillator for beat-down use. CONSTITUTION:The output of oscillator 1 is set to phase comparator 3 after division 2, and the output of voltage control oscillator 5 is compared with the signal underwent frequency conversion 7 and variable division 4. Then the output is applied to oscillator 5 via loop filter 6. Thus, the PLL circuit is constituted, oscillating the double frequency of the high frequency band required for the transmission and reception via divider 4 and local oscillator LO for beat-down use. In such way, the high-accuracy oscillation frequency can be obtained. |
