A low-noise, 900-MHz VCO in 0.6-μm CMOS |
| |
Authors: | Chan-Hong Park Beomsup Kim |
| |
Affiliation: | Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon; |
| |
Abstract: | This paper describes a low-noise, 900-MHz, voltage-controlled oscillator (VCO) fabricated in a 0.6-μm CMOS technology. The VCO consists of four-stage fully differential delay cells performing full switching. It utilizes dual-delay path techniques to achieve high oscillation frequency and obtain a wide tuning range. The VCO operates at 750 MHz to 1.2 GHz, and the tuning range is as large as 50%. The measured results of the phase noise are -101 dBc/Hz at 100-kHz offset and -117 dBc/Hz at 600-kHz offset from the carrier frequency. This value is comparable to that of LC-based integrated oscillators. The oscillator consumes 10 mA from a 3.0-V power supply. A prototype frequency synthesizer with the VCO is also implemented in the same technology, and the measured phase noise of the synthesizer is -113 dSc/Hz at 100-kHz offset |
| |
Keywords: | |
|
|