System Design of RF Receiver and Digital Implementation of Control Logic

qitianhua

Abstract
This report is the outcome of a thesis work done at Linköping University, campus
Norrköping. The thesis work was part of the development of a RF transceiver chip for
implantable medical applications. The development was done in cooperation with
Zarlink Semiconductor AB, located in Järfälla, Stockholm.
The transceiver is divided into three main blocks, which are the wakeup block, the
MAC block and the RF block. The wakeup block is always operating and is awaiting a
wakeup request in the 2.45 GHz ISM-band. The RF-block is operating in the 400MHz
ISM-band and is powered up after wakeup The MAC is the controller of the whole
chip. All three blocks in the transceiver structure should be integrated on the same
chip, using TSMC 0,18μm process design kit for CMOS (Mixed Signal / RF).
The purpose of the thesis work was to develop the wakeup circuit for the transceiver.
The main purpose was to develop the digital control logic in the circuitry, using RTLcoding
(mainly VHDL) but the thesis work also included a system analysis of the
whole wakeup block, including the front-end, in order to get a better overview and
understanding of the project.
A complete data packet or protocol for the wakeup message on 2.45 GHz is defined in
the report and is one of the results of the project. The packet was developed
continuously during progress in the project. Once the data packet was defined the
incoming RF stage could be investigated.
The final proposal to a complete system design for the wakeup block in the RF
transceiver is also one of the outcomes of the project. The front-end consists mainly of
an LNA, a simple detector and a special decoder. Since the total power consumption
on the wakeup block was set to 200nA, this had to be taken under consideration
continuously. There was an intention not to have an internal clock signal or oscillator
available in the digital part (to keep the power consumption down). The solution to

cqmyg5

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cjchang1

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mynameiswtx

System Design of RF Receiver and Digital Implementation of Control Logic

dainv

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sipdcc

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