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June 2009 [Components] SiGe PLL Synthesizer Suits Space Applications Space applications require a phase-lock-loop (PLL) frequency synthesizer that cannot only provide lowphase- noise performance, but operate within a hostile environment. When the PLL must be small in size, low in power, and low in cost, commercial choices are limited. Most are optimized for landbased mobile-communications use. Space applications usually require high phase-detector comparison frequencies to reduce the phase-noise impact of the... October 2007 [Components] Amplitude Equalizer Flattens Gain From 50 MHz To 7 GHz High-speed communications links are increasing the demand for wider link bandwidths. While many commercial companies are now offering monolithicmicrowave- integrated-circuit (MMIC) Darlington amplifiers internally matched to 50 Ω and designed to operate over multiple decades of bandwidth, these amplifiers have their limitations in terms of performance. While they are small in size and low in cost, one potential disadvantage is the gain slope that... |
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