University of Twente Student Theses


Design of an oscillator for satellite reception

Leong, Frank (2007) Design of an oscillator for satellite reception.

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Abstract:This thesis presents research on an LC-oscillator for Ku-band (10.7-12.7GHz) satellite reception. The zero-IF receiver architecture, proposed in the joint project involving the University of Twente and NXP Research, requires a 11.7GHz quadrature oscillator that achieves a phase noise of -85dBc/Hz@100kHz and an IRR of 30dB. Such an oscillator was designed in an NXP 65nm CMOS process. The performance of three types of LC-oscillators was compared: the Colpitts topology, the cross-coupled pair topology and a new topology, the crossed-capacitor oscillator. Both single and quadrature oscillator simulations were compared. Although the cross-coupled pair topology can achieve the highest FoM and the quadrature crossed-capacitor oscillator can achieve the highest IRR, the Colpitts oscillator was selected and developed, due to its reasonable IRR performance and its ability to run at a higher supply voltage than the cross-coupled pair oscillator, allowing sufficient phase noise performance. Development includes the design of a suitable buffer, a frequency tuning mechanism, and circuitry allowing the measurement of oscillation frequency and quadrature accuracy. Simulated performance and schematics are presented.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Computer Science MSc (60300)
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