A voltage-controlled oscillator with injection-locking input for phase-shifting applications at 30 GHz

A voltage-controlled oscillator (VCO) with injection-locking input and low quality factor is presented. Injection locking the VCO at a frequency of 15 GHz and frequency doubling the output signal leads to phase controllability and a big phase-tuning range. Excellent phase noise behavior has been achieved by using a noiseless reference oscillator. Due to the use of standard off-the-shelf components, the oscillator is easily scalable in frequency and low-cost in the realization. The implementation of the prototype was done on a high permittivity substrate to act as testbed for later LTCC implementation.