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In this paper, design and analysis of two modified Colpitts voltage-controlled oscillators (VCOs) with or without transformer feedback are presented. The loaded quality factors of these two VCOs are analyzed, and the result is the use of transformer feedback in the Colpitts oscillator decreases the loaded quality factor. Two K-band VCOs with and without transformer feedback using 0.5-μm GaAs enhancement/depletion...
This paper presents a 38% tuning bandwidth low phase noise differential voltage controlled oscillator (VCO) using a 0.5 mum enhancement/depletion-pseudomorphic high-electron mobility transistor (E/D-PHEMT) process. The proposed VCO is based on a differential topology with two common-gate transistors. To achieve a wide tuning range with low phase noise, varactor in the VCO core employs the E-mode PHEMT...
In this paper, a Ku-band low phase noise wide tuning range voltage controlled oscillator (VCO) using a 2-mum GaAs heterojunction bipolar transistor (HBT) technology is presented. A common-emitter (CE) topology with an inductor-capacitor (LC) feedback network is utilized in the circuit design, and the VCO demonstrates a low phase noise of -112.5 dBc/Hz at 1-MHz offset carrier frequency. The tuning...
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