Abstract
A Q-enhancement technique based on active compensation of monolithic inductors for parallel resonant LC tanks is presented. Narrowband Q-enhancement is achieved using a gyrator to produce a negative inductance and negative resistance. The circuit is optimized for low-power operation and allows DC voltage control of Q-enhancement. A simulated two-stage capacitively-coupled Butterworth filter in 0.18/spl mu/m CMOS consumes 1.9mW for a center frequency of 2.45GHz and a 100MHz bandwidth. The filter figure-of-merit is 135dBHz/mW.
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