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A technique to measure low frequency noise in illuminated photodiodes is presented, and some 1/f noise results are given for InGaAs devices. The ability of photodiodes to convert laser noise into RF noise is also discussed, together with other types of 1/f noise arising directly from the optical fiber, and particularly from scattering phenomena inside the fiber.

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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 .