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His current research interests include linear RF power amplifiers and nonlinear systems. R. Douglas Beards (M'95) received the B.Eng. (with high distinction) and M.Eng. degrees in electrical engineering from Carleton University, Ottawa, ON, Canada, in 1988 and 1990, respectively. He has spent his entire career with Nortel Networks, Ottawa, involved with the design of bipolar and BiCMOS RF integrated circuits for wireless communications. A. J. Bergsma received the B.Eng. and M.Eng. degrees in electrical engineering

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A CMOS Cherry-Hooper ampl@er that is modified to include source follower feedback is described. A small signal model that uses only the most dominant capacitances is used to derive the transferfinction of the circuit. The gain is significantly higher than that of the standard MOS Cherry-Hooper stage. Design techniques based on the analysis are suggested for broadband applications. A test circuit, fabricated in a 0.35 ,um CMOS technology, has 9.4 dB gain and 880 MHz bandwidth while consuming 6.0 mAj?om a 3.3 Vsupply. Eye diagrams of the test chip at 630 MS/s show good eye opening, giving confidence to the new amplifier's large signal performance. In addition, a six stage main ampl@er using the mod@ed Cherry-Hooper stages was fabricated in a 0.18 ,um CMOS technology. It draws 44 mA from a 1.8Vsupply. It has 39 dB single-ended gain, 2.1 GHz bandwidth, and 14.2 dB noisefigure.

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