David Ashby Email & Phone Number

Electronics Design Engineer with particular interests in analogue circuit design and applications in control, measurement, and instrumentation. Recent design experience includes:Analogue circuit analysis and simulation with spice (LTspice).Designing high-stability low-noise current sources for primary standard instrumentation.Designing current sources for driving 36-volt LED arrays.Designing pulse amplifiers for ionisation detectors.Designing high linearity (sub-ppm) ADCs for voltage measurement.Designing switched-mode DC-DC converters / regulators, with emphasis on achieving low ripple and noise. Also designed DC-DC converters featuring programmable variable output voltages.Designing power control circuits for hot-pluggable electronics that use several power rails.Analysis and design specification for analogue signal conditioning path and A to D conversion using a 24-bit sigma-delta ADC. This required particular attention to linearity and low noise.Designing analogue closed-loop temperature controllers that drive small peltier coolers efficiently and with low noise.Designing low noise photodiode amplifiers and high bandwidth op-amp photodiode amplifiers.Designing signal conditioning electronics for LVDT transducers.Hardware design for micro-controller systems (e.g., STM32F... series microcontrollers).Designing test jigs for automated functional testing of PCB assemblies.Schematic entry, PCB layout. Writing PCB design briefs to instruct 3rd-party PCB designers.Writing adjustment and test procedures for printed circuit board assemblies and systems.Experience also includes embedded systems programming in 'C'.