TY - JOUR
T1 - On the amplitude and phase errors of quadrature LC-tank CMOS oscillators
AU - Mazzanti, Andrea
AU - Svelto, Francesco
AU - Andreani, Pietro
PY - 2006
Y1 - 2006
N2 - An analytic approach for the estimation of the phase and amplitude imbalances caused by component mismatches and parasitic magnetic fields in two popular quadrature LC oscillators is presented. Very simple and closed-form equations are derived, proving that, although the two topologies share the same small signal circuit, they display very different sensitivities to the mentioned sources of imbalance. Moreover, it is shown that parasitic inductors coupling, overlooked up to date, plays a key role ultimately limiting the achievable phase accuracy. The theoretical results are verified through extensive simulations and measurements on a 1.7-GHz quadrature oscillator and frequency up-converter implemented in a 0.18-μm CMOS process.
AB - An analytic approach for the estimation of the phase and amplitude imbalances caused by component mismatches and parasitic magnetic fields in two popular quadrature LC oscillators is presented. Very simple and closed-form equations are derived, proving that, although the two topologies share the same small signal circuit, they display very different sensitivities to the mentioned sources of imbalance. Moreover, it is shown that parasitic inductors coupling, overlooked up to date, plays a key role ultimately limiting the achievable phase accuracy. The theoretical results are verified through extensive simulations and measurements on a 1.7-GHz quadrature oscillator and frequency up-converter implemented in a 0.18-μm CMOS process.
U2 - 10.1109/JSSC.2006.874333
DO - 10.1109/JSSC.2006.874333
M3 - Journal article
SN - 0018-9200
VL - 41
SP - 1305
EP - 1313
JO - I E E E Journal of Solid State Circuits
JF - I E E E Journal of Solid State Circuits
IS - 6
ER -