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An integrated 1.5 V 6 GHz Q-enhanced LC CMOS filter with automatic quality factor tuning using conductance reference

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4 Author(s)
Shaorui Li ; Dept. of Electr. Eng., Columbia Univ., New York, NY, USA ; N. Stanic ; K. Soumyanath ; Y. Tsividis

We report the design of an integrated 4th-order Q-enhanced LC bandpass filter with automatic Q tuning. The filter passband is centered at 6 GHz, and has a bandwidth of 100 MHz. The filter draws 15 mA from a 1.5 V supply, achieving a 1-dB compression point dynamic range of 43 dB, while the total output noise integrated over the passband is -70.5 dBm. The Q-tuning loop uses a resonator, which replicates those in the filter, as a voltage-controlled oscillator, and a conductance reference, rather than the conventional voltage reference, to achieve better controllability. The tuning system draws 14 mA from the power supply. The whole design occupies an area of 1.5×1.5 mm2. The chip has been fabricated in the UMC, standard CMOS, 0.18 μm process.

Published in:

2005 IEEE Radio Frequency integrated Circuits (RFIC) Symposium - Digest of Papers

Date of Conference:

12-14 June 2005