Details of Grant 

EPSRC Reference:	GR/J89521/01
Title:	HIGHLY EFFICIENT LINEAR MODULATORS/TRANSMITTERS
Principal Investigator:	Bateman, Professor A
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department:	Electrical and Electronic Engineering
Organisation:	University of Bristol
Scheme:	Standard Research (Pre-FEC)
Starts:	01 July 1994	Ends:	30 June 1996	Value (£):	88,922
EPSRC Research Topic Classifications:	RF & Microwave Technology
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Summary on Grant Application Form
Objectives:(i) Investigate a novel technique for linear amplification of radio signals that is both power efficient and low cost.(ii) Produce a prototype amplifier based on the CALLUM principle in order to demonstrate the feasibility and performance of the technique.Progress:The project is now approximately 6 months old, with 1 years remaining. To date, theoretical analysis and comprehensive computer simulations have been undertaken of the CALLUM techniques, giving rise to four new realisations of the basic modulator process, each giving better performance than the original design described in the EPSRC application. Based on this early work, two papers have been written and accepted for publication by the IEE and IEEE Transactions. The simulation work has identified the most appropriate CALLUM designs and during the next 12 month period it is intended to prototype these systems in order to evaluate the practical performance with component tolerance, RF crosstalk, etc. The information gathered from the hardware trials will be used to refine the simulation models. It is worth stating that the early simulation results indicate that the CALLUM technique can be used to meet the existing and proposed DAMPS and TETRA air interface specifications, and thus, if the technique can achieve good efficiency, will represent a major improvement in linear transmitter design.
Key Findings
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Organisation Website:	http://www.bris.ac.uk