Title :
A low-phase noise LC-QVCO in CMOS technology
Author :
Hyoung Chul Choi ; So Bong Shin ; Sang-Gug Lee
Author_Institution :
Inf. & Commun. Univ., Daejeon, South Korea
Abstract :
This letter presents a source-injection parallel coupled (SIPC) quadrature voltage-controlled oscillator (QVCO) topology. In the proposed SIPC-QVCO, compared to the conventional parallel-coupled LC-QVCO (P-QVCO), the coupling transistors are configured in a way so that the 1/f noise, contributed by the coupling transistors at the output, can be avoided. The newly proposed SIPC-QVCO and conventional P-QVCO are fabricated based on 0.25 μm CMOS technology. The phase noise of SIPC-QVCO measured at 1.5 GHz shows more than 10 dB improvement than that of the conventional P-QVCO over the offset frequency range of 10 k /spl sim/ 1 MHz while dissipating the same amount of power.
Keywords :
1/f noise; CMOS integrated circuits; UHF integrated circuits; UHF oscillators; coupled circuits; integrated circuit noise; network topology; phase noise; voltage-controlled oscillators; 0.25 micron; 1.5 GHz; 1/f noise up-conversion; CMOS technology; coupling transistors; low-phase noise LC-QVCO; phase noise; source-injection parallel coupled quadrature voltage-controlled oscillator topology; CMOS technology; Frequency conversion; Noise measurement; Phase measurement; Phase noise; Semiconductor device noise; Signal generators; Topology; Voltage; Voltage-controlled oscillators; RF; complementary metal oxide semiconductor (CMOS); phase noise; quadrature voltage-controlled oscillator (QVCO); source-injection parallel coupled quadrature VCO (SIPC-QVCO);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2004.834553
