Abstract
This paper presents a two-stage wideband low noise amplifier (LNA) with active balun. The first stage adopts current bleeding and dc coupled common-drain feedback techniques to achieve high gain low noise figure and acceptable input matching over a wide frequency band. A conventional single-ended to differential convertor is used as a second stage. The proposed wideband LNA is designed for DVB-T application and implemented in 0.18-µm CMOS technology. The circuit achieves a 1 GHz bandwidth ranging from 10 MHz to 1 GHz over which the measured gain is 23 dB and the noise figure ranges from 1.61 to 3.81 dB. The measured gain ripple and phase differences in the entire pass band of the proposed LNA are less than 0.6 dB and 3.8°, respectively. This LNA core dissipates 21.6 mW power.
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