A compact reconfigurable CMOS low-noise amplifier (LNA) is presented for applications in DCS1800, UMTS, WLAN-b/g and Bluetooth standards. The proposed LNA features first a current reuse shunt-feedback amplifier for wideband input matching, low-noise figure and small area. Secondly, a cascode amplifier with a tunable active LC resonator is added for high gain and continuous tuning of bands. Fabricated in a 0.13 μm CMOS process, the measured results show >20 dB power gain, <3.5 dB noise figure in the frequency range of 1.8-2.4 GHz, return losses S 11 and S 22 lower than −12 and −14 dB, respectively, with a moderate IIP3 of −11.8 dBm at 2.4 GHz. It consumes 9.6 mW from a 1.2 V supply voltage, while occupying an active silicon area of only 0.052 mm 2 .
This study presents a new design of compact transimpedance amplifier (TIA) for optical communication applications. By adopting the regulated common gate (RCG) topology, the proposed amplifier is designed and synthesised based on a thirdorder elliptic filter approach. Implemented in 0.13 μm complementary metal oxide semiconductor technology, the post layout simulation results provide 50 dB Ω of direct current gain, 15 GHz of bandwidth, 20 pA/ Hz as an input referred noise current performance. The proposed RCG TIA occupies a 19 × 36 μm 2 while consuming 5.34 mW under 1.2 V supply voltage, only.
In this study, a suitable sub‐mW frequency down converter for internet of things is presented. It is based on a single balanced switched transconductance mixer driven by a current‐reuse LC voltage controlled oscillator (LC‐VCO). For cognitive radio demonstration, the frequency converter is implemented with a tunable low‐noise amplifier (LNA) in 0.13 µm standard complementary metal oxide semiconductor (CMOS) technology. Post‐layout simulations return a gain conversion of 27 dB with a single‐sideband noise figure of 8 dB (LNA included) for a consumption of 0.97 mW under a voltage supply of 1.2 V and an active area of 0.4 mm2. The stand‐alone LC‐VCO prototype exhibits a measured phase noise of −102 dBc/Hz at 1 MHz offset while showing −114 dBc/Hz in the post‐layout simulation. The LC‐VCO measured power consumption is only 260 µW from 1 V voltage supply with an active area of 0.173 mm2.
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