| 摘要 |
A system for bi-phase code generation with signal amplification is disclosed in which a digital signal applied to the tuning voltage input of an injection locked voltage controlled oscillator (VCO) is used to produce a corresponding phase modulated output signal at the locked frequency of the VCO. The invention includes a voltage controlled oscillator (VCO) 12, a tuning voltage source 14, a three-port circulator 20, and a locking frequency source 28. The output signal from the VCO 18 is applied to a second input port of the threeport circulator 22, while a locking frequency signal is applied to a first input port of the three-port circulator 24. This arrangement causes the frequency of the output signal produced by the VCO 18 to be locked to the frequency of the signal injected into the first port of the three-port circulator. As the output frequency of the VCO 18 is locked to the frequency of the injected signal, a change in the tuning voltage applied to the VCO 16 results in a corresponding change in the phase of the output signal produced by the VCO 18, instead of a change in frequency. This allows the final output signal of the injection locked VCO 18 to be phase modulated in accordance with the applied tuning voltages. Furthermore, the injected signal is amplified by the associated gain produced by the VCO. Consequently, both signal amplification and continuous phase adjustability is achieved with this invention. |
