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This paper presents a study of design optimization of voltage-controlled oscillators. The phase noise of LC-type oscillators is basically limited by quality factor of inductors. It is experimentally known that higher-Q inductors can be achieved at higher frequencies while oscillation frequency is limited by parasitic capacitances. In this paper, the minimum transistor size and degradation of quality...
This paper proposes a low-phase noise CMOS VCO for more than 10 GHz oscillation, which utilizes a PMOS-bias and PMOS-crosscouple topology. PMOS transistors have lower 1/f noise while they have larger gate capacitance. In this work, a transmission-line resonator is employed to enhance the high-frequency operation. The VCO is fabricated by a 180 nm Si CMOS process. A phase noise is -112.6 dBc/Hz, and...
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