A practical approach to generate on-chip precise and slow analog ramps, intended for time-domain analog testing, monotonicity and histogram-based tests of ADCs is proposed. The technique uses an analog discrete-time adaptive scheme to calibrate the ramp generator. The lowest slope is 0.4 V/ms. Three implementations are presented for different levels of accuracy and complexity. Measurement results show excellent accuracy and programmability, up to only 0.6% of slope error and maximum integral nonlinearity error of 175 V. Experimental and theoretical results are in good agreement.
A new implantable bladder volume-monitoring device based on the impedance measurement of the detrusor muscle is described. The system is completely autonomous and forms a mixed-signal (analogue/digital) feedback loop with a neuro-stimulator to rectify bladder dysfunctions (incontinence and retention) through neuromuscular stimulation techniques. A programmable instrumentation amplifier and a signal processing block, to eliminate the artefacts caused by the patient's movements, have been designed and tested. The layout for the signal processing block has been realised in 0.8 micron BiCMOS technology.
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