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A monolithic CMOS 2368±30 MHz transformer based Q-enhanced series-C coupled resonator bandpass filter

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2 Author(s)
Kulyk, J. ; Dept. of Electr. & Comput. Eng., Univ. of Calgary, Alta., Canada ; Haslett, J.

A three-pole 0.1 dB ripple Chebyshev series-C coupled resonator bandpass filter with transformer-based Q-enhancement is presented. This Q-enhancement technique compensates resonator loss and produces a flat passband response with low insertion loss. The compensation scheme uses frequency-dependent negative resistance to compensate frequency-dependent inductor losses, avoiding passband distortion, which is a problem with cross-coupled negative resistance circuits. Fabricated in 0.18 μm CMOS, the measured filter center frequency is 2368 MHz with a 60 MHz (3 dB) bandwidth, including probe pad and connecting trace parasitic losses. The filter draws 5.84 mA at 1.5 V, and the die area is 1.5 mm×1.5 mm.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 2 )