This paper presents the system level design of a programmable ADC that can cover the bandwidth-accuracy space of UWB and Bluetooth standards by employing a capacitive interpolation flash ADC and a sigma-delta ADC. The system level performance of the ADC architectures has been evaluated, and circuit level specifications have been established, considering the most critical circuit non-idealities. The behavioral simulation results show that the ADC can achieve 30 dB SINAD at 528 MSPS in UWB mode, and 86 dB SINAD at 1 MSPS in Bluetooth mode.
-A relative ultrasound energy estimation circuit has been designed in a standard 0.35-µm CMOS process, to be a part of a thumb size internet connected wireless ultrasound measurement system. This circuit measures the relative energy between received ultrasound pulses, and presents an output signal that is linear to the received energy. Post-layout simulations indicate 7 bit linearity for 500 mV input signals, 5 µsec startup and stop times, 2.6 mW power consumption during active state. The active area measures 0.6 mm 2 including digital logic, bias generation, and an on-chip oscillator. The circuit has been sent for manufacturing in the austrianmicrosystems C35B4 process via Europractice MPW.
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