As the Hong Kong Police Force used an enormous amount of Chinese made tear gas in the recent protest, toxic gas such as hydrogen cyanide (HCN) is being released. Concerns have been raised on its harmful effect on citizens. Due to the expensive cost of HCN gas detectors, I am in collaboration with a group of engineers and scientist in Hong Kong, to design a cheap HCN gas detector for real-time data collection on HCN concentration over Hong Kong.

A 6-Bit Successive Approximation Analogue-to-Digital Converter in 0.18 um CMOS technology with 1.8 V supply, is presented. The ADC design achieved less than 800 uW with both static and dynamic power consumption at 100 kHz sampling frequency with an area of 77.84 um x 190.12 um. The input voltage range is designed to convert analogue signals from 0.4 V to 1.4 V with an average integrated non-linearity (INL) and differential non-linearity (DNL) of 0.305 LSB and 0.073 LSB error.

A face recognition investigation has been conducted using Principle Component Analysis (PCA) for dimensional reduction. Two PCA multi-class classifiers, Nearest Neighbour (NN) and an alternative classifiers using reconstruction error, are explored and compared. Then, Linear Discriminant Analysis (LDA) and ensemble learning is performed the accuracies and computational cost are analysed. 93% accuracy is achieved with PCA-LDA Ensemble face recognition.

The filter was implemented on a DSP6713 chip using Code Composer Studio. The speech enhancement system is implemented based on noise estimation and frequency domain subtraction techniques such as low-pass filter in magnitude domain, over-subtractions.

Aim to measure impedance of DUT over different frequencies to determine if DUT is a series or parallel RC circuit. Auto-ranging is available to provide accurate measurements.

A NIOS II processor is designed with dedicated hardware blocks using Quartus II and Verilog HDL to evaluate a summation of complex trigonometric function. With the use of custom instruction involve hardware floating point artithmetic, CORDIC algorithm, overclock system by 2.4 time from using different arrangement to fit the system on to the FPGA chip and other optimisations. The latency of the evaluation has improved by 99.95% on a Terasic DE0 board.

The prototype on the left hand side is our second year project at Imperial College. The purpose of the Articulated Glove was to aid people with hand weakness caused by neurotrauma injuries through a physical solution that is cost-effective, portable, comfortable and well-designed.

This project aimed at improving my understanding with op-amps. The amplifier implemented on the breadboard has a gain of 86 dB with 3 dB of pass-band ripple.

A BPSK and DPSK system is built via LabView Communication with NI USRP. The aim was to have a better understanding on trade offs and communication systems.