A sub 125 nW sub-threshold analog adaptive sampler in 180 nm CMOS.

We present an ultra low power analogue adaptive sampler for extraction of features from an arterial blood pressure signal, prior to ADC operation or conversion. The architecture is implemented and simulated in UMC 180 nm technology. A worst case power consumption across process variation of 124.6 nW was achieved, with a process invariant key-point timing error of approximately 2.31 ms, corresponding to a sample error of magnitude less than 0.1 mmHg, simulated at body temperature of 37°C. This is significantly below the standard clinical recording accuracy of 1 mmHg for electronic measurement tools.

A 180 nm CMOS analog adaptive sampler for blood pressure feature extraction.

This paper presents an analogue feature detector for extraction and sampling of key-points on an arterial blood pressure signal in both humans and small mammals used as human physiological models. A CMOS integrated circuit was implemented in UMC 180nm technology, utilizing the proposed sampling method to greatly reduce the number of samples necessary for meaningful reconstruction of the low bandwidth signal. This circuit was interfaced with an external ADC to fully extract the feature points, and evaluate the system performance. Over the target heart rate range of 1 to 25 Hz, the system outperformed typical home measurement tools for systole and diastole extraction.

A 1.04µW wireless integrated MEMS interface in UMC 0.18µm CMOS.

This paper presents an ultra low-power integrated interface for capacitive and resistive MEMS and sensors, intended for use in biomedical applications. The interface encodes the sensed data in the time between transmitted UWB pulses: this reduces the number of transmitted bits and benefits the power consumption. The interface was designed and fabricated in the UMC 0.18µm CMOS process: the power consumption of the system was measured to be 1.04µW at a sample rate of 37Hz.