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We present a CMOS 8-channel frequency division multiplexer (FDM) to interface a phased array of micro coils for 9.4 T (400 MHz Larmor precession frequency ω0) for magnetic resonance imaging (MRI). The integrated multiplexer contributes towards a solution to achieve phased arrays with a massive number of coils without unnecessarily increasing system complexity, the size of hardware, and cost. The multiplexer...
Gaussian Frequency-shift-keying (GFSK) is a widely used modulation scheme in state-of-the-art wireless transceivers. Most often a phase-locked-loop (PLL) is utilized for carrier generation and GFSK modulation. Using this architecture the maximum applicable data rate is limited by the PLL's bandwidth. This paper investigates the possibility of using two-point modulation in order to be able to choose...
A wideband LC voltage controlled oscillator (VCO) is presented in this work. Measurements show a wide relative tuning range of 37.6% from 4.57 GHz to 6.69 GHz with a tuning voltage from 0 to 3 V. Using an integrated divide-by-2 circuit, both the 2.4 GHz and 5.8 GHz ISM bands can be covered. A key feature is the low gain variation, which stays below 12.5 % up to 6GHz and below 33.3% for the whole tuning...
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