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This paper studies application of a semi-active dual loop feedback network in an ultrawideband low-noise amplifier which has been realized in a 130-nm bulk digital CMOS process. The proposed simple feedback connection is shown to improve amplifier stability and to increase isolation, with no discernible extra cost. Measurement results support the stated benefits with stable amplifier operation in...
A 1-5 GHz ultra-wideband CMOS low-noise amplifier (LNA) is presented. A common-gate topology is adopted for the input stage to achieve wideband input matching, while a cascode stage is used as the second stage to provide power gain at high frequencies. By using two inductors in the LNA, a small chip area is obtained. The LNA has been fabricated in a standard 0.18 μm CMOS technology. The measured maximum...
This paper presents a low-power down-conversion mixer for 3.1~4.8 GHz MB-OFDM UWB applications. The proposed mixer is based on folded double-balanced Gilbert cell and employs following techniques: two cross-coupling capacitors at the transconductance stage enhance conversion gain and reduce input noise; two choke inductors reduce flicker noise from the switch quad; tuning capacitors and resistors...
The design of a fully-integrated linearized CMOS bidirectional distributed amplifier (DA) based active circulator with broadband distortion cancellation capability is presented. The S21 differential power gain peaks at 7 dB and then rolls off to a unity gain bandwidth of 11.5 GHz. The simulated tunable isolation performance is better than -26 dB. The simulated linearized IIP3 show a 10 dB improvement...
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