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This paper presents a low-voltage and low phase noise LC-VCO IC with simplified noise filtering in 180-nm CMOS technology. The novel VCO IC includes a cross-coupled pMOSFET pair, an LC resonator, buffer amplifiers and a tail inductor for noise filtering. The novel and conventional LC-VCO ICs are designed, fabricated and fully tested on wafer. At a power supply voltage of only 0.5 V, the novel VCO...
A novel 2.4 GHz-band 0.5-V Class-C PMOS VCO IC with an amplitude feedback loop is proposed. The amplitude feedback loop circuit consists of a detector, an invertor and a bias control circuit. The feedback loop automatically changes the bias of LC-VCO and shifts the oscillation mode from initial Class-AB to Class-C in steady-state. The Class-C VCO IC is designed, fabricated and fully evaluated in 180-nm...
An ultra-low-voltage low phase noise LC-VCO IC has been demonstrated using 180-nm CMOS technology. The LC-VCO IC includes a cross-coupled pMOSFET pair, a symmetric three-port spiral inductor, MOS varactors and buffer amplifiers. The LC-VCO IC is designed, fabricated and fully tested on wafer. The VCO IC exhibits a phase noise of −118.9 dBc/Hz at 1 MHz offset from the 2.29 GHz carrier at a supply voltage...
A Class-C voltage-control-oscillator (VCO) IC with an amplitude feedback loop for ultra-low-voltage application is proposed. The Class-C VCO consists of an LC-VCO circuit and an amplitude feedback loop to shift LC-VCO bias condition from initial Class-AB start-up to steady Class-C low current oscillation. The amplitude feedback loop is formed by a detector and a comparator with low voltage supply...
A novel LC-VCO IC is proposed to achieve low-voltage low-power operation even at a supply voltage below the threshold voltage. The LC-VCO consists of a VCO circuit, a power detector circuit and a comparator circuit. A feedback loop consisting of the power detector and the comparator can control the bias condition of the VCO. The LC-VCO IC has been designed, fabricated and fully evaluated using 65...
An ultra-low-voltage LC-VCO IC has been demonstrated using 130nm CMOS technology. The LC-VCO IC includes a cross-coupled nMOSFET pair, a spiral inductor, MOS varactors and a buffer amplifier. The LC-VCO IC is designed, fabricated and fully evaluated on wafer. The VCO IC exhibits a phase noise of −137 dBc/Hz at 1 MHz offset from the 2.2 GHz carrier at a supply voltage of only 0.5 V.
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