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用分谐波注入锁定一个微弱的寄生振荡信号,能够对毫米波雪崩二极管振荡器实现有效的稳定。在分谐波注锁实验中,当分谐波频率与主振频率之比为1:2时,在10兆赫的锁定频率范围内可以得到大于19分贝的锁定增益;在分谐波比值为1:4和1:6时,可分别获得12分贝和13分贝的锁定增益。利用寄生振荡信号时,在分谐波频率与寄生振荡信号频率之比为1:2的情况下,可在10兆赫的锁定范围内得到高于32分贝的锁定增益(这比对主振信号锁定时的锁定增益要高13分贝);在分谐波比为1:4时,锁定增益高于15分贝。用频谱分析仪测量表明,被分谐波注入锁定的振荡信号几乎与注入信号相一致。这些数据表明,用分谐波注入锁定的锁定增益比用主振信号注入锁定高。
Subharmonic injection locking a weak parasitic oscillation signal, the millimeter wave avalanche diode oscillator can be effectively stabilized. In subharmonic injection experiments, when the ratio of subharmonic frequency to main frequency is 1: 2, the lock-in gain of more than 19 dB can be obtained in the 10 MHz lock-in frequency range. When the subharmonic ratio is 1: 4 and 1: 6, respectively, 12 dB and 13 dB gain lock. With parasitic oscillation signals, a lock-in gain higher than 32 dB can be obtained over a lock range of 10 MHz with a ratio of sub-harmonic frequencies to spurious oscillation signal frequencies of 1: 2 When the locking gain to 13 dB higher); in the sub-harmonic ratio of 1: 4, the lock-in gain higher than 15 dB. Measurement with a spectrum analyzer shows that the oscillatory signal locked by subharmonic injection is almost in agreement with the injected signal. These data show that the locking gain injected with sub-harmonic injection is higher than the injection locked with the main vibration signal.