A Monolithic CMOS 2368<tex>$pm$</tex>30 MHz Transformer Based<tex>$Q$</tex>-Enhanced Series-C Coupled Resonator Bandpass Filter

Jim Kulyk, J.W. Haslett

IEEE Journal of Solid-State Circuits · 2006 · 50 citations · 22 references

Concepts

Abstract

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 /spl mu/m 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/spl times/1.5 mm.

References

22