184 mu W ultrasonic on-off keying/amplitude-shift keying demodulator for downlink communication in deep implanted medical devices
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This thesis aims at developing wireless systems with a strong emphasis on low-power consumption and low-voltage operation. The main technical objective is the development of a single cells battery operated fully integrated CMOS RF transceiver that fulfills ...
A CMOS low-noise amplifier (LNA) with two variable gain ranges of 6 and 9 dB is presented. Variable gain is realized by using linearized MOS resistive circuits (MRCs) as voltage-controlled resistors. One of these resistors is located in the feedback loop o ...
We have measured phase modulation in the first chemical beam epitaxy grown InGaAsP/InP barrier, reservoir, and quantum well electron transfer structures. We obtain a negative refractive index change, DELTAn, similar to that found in the InGaAs/InAlAs syste ...
New radio-frequency pulse envelopes are presented for selective inversion and in-phase excitation in NMR. The envelope functions consist of superpositions of three or four time-shifted Gaussians with optimized widths and peak amplitudes. The offset depende ...