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Fig. 1 shows the equivalent circuit for the local oscillator. In this circuit, when Ci = 22 pF, the change in the negative resistance versus C2 iS shown in Fig. 2, the change in the operational load capacitance is shown in Fig. 3, and the frequency deviation is shown in Fig. 4. In the application circuit, C2 = 120 pF, and in this case the negative resistance according to Fig. 2 is -58 I . In order to increase the negative resistance, it is necessary to decrease the value of C7. To increase the oscillation level, it is possible to add extemal resistor Ri and raise the local oscillator current. However, the oscillation level on pin l must be set t0 110 dB or less. If set to a greater level, distortion will occur in the oscillation waveform.