Final Year projects (updated 7-Oct-07)
Supervisor: Dr C. Papavassiliou  Room: 915  Email: c.papavas@imperial.ac.uk

 


Student self-proposed design and construct

Propose a gadget you would like to design and make. Possible application areas are: audio, remote control and remote sensing. You will design the gadget, make a prototype and test it. The project does not have to be novel but should address an engineering challenge in low noise circuits, radio frequency electronics or instrumentation engineering.
Projects may use microcontrollers.


Laminar substrates for slow wave filters (4T only)

Laminar substrates, i.e. sandwiches of different materials, support the propagation of slow electromagnetic modes. Miniaturised RF printed filters can in principle be built on laminar substrates, offering the possibility of developing high quality monolithic filters for CMOS chips. We will make slow mode filters on a novel experimental platform developed in our research group. We will measure and simulate these filters on full wave CAD simulators.

 


Low noise monolithic LC oscillators

We will use simulations to compare a number of tuning mechanisms for CMOS voltage controlled oscillators. Our objective is to understand how to keep phase noise low while maintaining a wide tuning range. The project may also involve measurements on existing CMOS circuits (chips) developed in our research group.


Heterodyne phase noise measurement system (4T only)

Measuring oscillator phase noise presents a number of challenges. The most obvious one is that the device tested must be phase locked to the Spectrum analyser Local Oscillator. The second challenge is to frequency-translate a small frequency range around the fundamental mode of the oscillator to a convenient for observation Intermediate Frequency. This is a Design and make project, and requires a solid understanding of Radio Frequency electronics, as well as good laboratory technique.


CMOS polar amplifier in the 3-10GHz UWB band.  

We will design a CMOS integrated power amplifier for the MB-OFDM implementation of Ultra Wideband Radio operating in the in the 3-10GHz frequency range. A polar amplifier is the combination of a phase modulator and a D/A converter. Interfacing the two circuits without losing efficiency is the problem we wish to study. This project involves integrated circuit design and simulation on the Cadence CAD platform.


Weakly coupled oscillator arrays

Groups of coupled oscillators develop collective modes, spectrally purer than the original oscillator. The simplest example is the ring oscillator widely used in integrated electronics, despite its rather poor phase noise characteristics.

In this project we will investigate, through SPICE simulations, the noise properties of arrays of oscillators.


High resolution artificial vision

One way of increasing bandwidth in a sampled measurement (at the expense of dynamic range) is to introduce jitter in the sampling process. We look to develop an electronic way of introducing jitter into a light detection experiment, by modulating the bias of the sensors. We will then computationally attempt to extract higher resolution from the jittered raw measurements.


Lossy filter synthesis

We will review the literature on lossy filter synthesis and investigate the capabilities and limitations of using lossy building blocks to synthesise filters. This project is related to synthesising all-transistor filters, since transistors are by nature lossy integrators. Good understanding of analysis of circuits and 2nd year analogue is essential.

 


This page maintained by Christos Papavassiliou
Last updated:
7 October 2007