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A broadband phase-locked oscillator (PLO) based on Ka-band single tuning voltage-controlled oscillator (VCO) module is designed, fabricated and measured. The configuration based on the frequency offset dividing phase-locked loop was realized with a simple VCO module, a phase-locked loop board, and an image-rejection mixer. The locking range of the PLO system covers the whole 4.6 GHz VCO tuning range. An adaptive bandwidth theory is used to overcome problems caused by large variation of the VCO tuning sensitivity and to improve the in-band phase noise of PLO by at least 17 dB. The experimental results show that the in-band phase noise of −96 dBc/Hz at offset frequency of 10 kHz is achieved with the loop bandwidth of 1 MHz. The measured RMS jitter of the PLO at 37.8 GHz is 31 fs for 1 kHz to 100 kHz frequency offset range. [ABSTRACT FROM PUBLISHER]

A Ka-band local oscillator generator based on YIG-tuned oscillator is designed, fabricated and measured for astronomical telescope applications. The optimized bandwidth analysis can overcome high phase noise problems caused by poor microwave photonic source noise and to improve the outband phase noise of LO by at least 10.5 dB. The experimental results show that the 33.8 GHz LO phase noise of −107 dBc/Hz is achieved at offset frequency of 700 kHz and exhibits a reference spurs of −71 dBc. [ABSTRACT FROM PUBLISHER]

A Ka-band offset phase-locked single-tuning voltage-controlled oscillator (VCO) module with an automatic loop bandwidth (LBW) calibration is designed, fabricated and measured. In this work, the wide tuning range is realized by automatic loop filter selection through self-calibration circuitry. The proposed calibration technique and adaptive LBW theory are used to overcome problems caused by large variation of the VCO tuning sensitivity and to improve the in-band phase noise of phase-locked oscillator (PLO) by at least 17 dB. The experimental results show that the 33.55 GHz PLO phase noise of −97 dBc/Hz is achieved at offset frequency of 200 kHz. [ABSTRACT FROM PUBLISHER]