| 摘要 |
PURPOSE:To correct nonlinearity of the frequency sweep characteristic by feeding a signal to a voltage controlled oscillator via a feedback loop comprising an F-V converter and an analog subtraction means. CONSTITUTION:The voltage controlled oscillator 1 outputs a frequency sweep signal FS by using a sawtooth wave Si inputed from a terminal 7, the frequency sweep signal FS is F/V-converted by the F-V converter, fed back to an analog subtraction means 6, where the signal is subtracted with the sawtooth wave Si inputted from the terminal 7. The signal outputted from the subtraction means 6 is a nonliknear component of the frequency sweep characteristic of the voltage controlled oscillator 1. The nonlinear component is amplified by an amplifier 8 having a large gain and inputted to a control terminal of the voltage controlled oscillator 1. As a result, the nonlinear frequency characteristic of the voltage controlled oscillator 1 is corected.
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