George Lee, Lulan Shen and Rabia Rassil, supervised by Professor Frederic Nabki

Department of Electrical and Computer Engineering, McGill University, Montreal, Canada

Ultra Wideband Impulse Radio Transmitter Characterization

Acknowledgments

Conclusions

Background

Introduction Design Results.

Improvements

Reference

Our design project is to design and implement a low

power functional UWB transmitter using a 0.13µm CMOS

chip. We designed and fabricated our own PCB, while

using the FPGA to send the input control signals to the IC

chip. Our IC chip is a strong candidate for short distance

wireless data rate transmissions such as Bluetooth.

OOK correlates the number

of pulses generated for a

certain period to the actual

value.

Pulse Position Modulation

On/Off Switching Key

PPM uses the position for a

certain period to encapsulate

the information. When the

pulses are in the 1st half of

the period, the data value

equal to 1. The 2nd half of the

period equals to a value of 0.

Pulse Generator : Varies the pulse width

VCRO: Generates modulated pulses

Amp S2D: Amplifies and shifts by 180°Power Cycling: Turns off circuit when not transmitting

Binary Phase Shift Keying

BPSK uses trinary logic 1, 0 and -1. BPSK uses phase

shifting by 180° to reverse the pulse and implement -1.

Transmitter

Transmitter PCB and Layout

PCB design contains VHDL connector, transmission line,

buffer, biasing and power supply. We reduced the

number of pins from 64 to 28 pins. Most of the pins are

used for power supply and biasing.

The frequency modulation is shown with control bits 7 and

3 at frequencies of 3.2GHz and 6.1GHz.

The width modulation control bits are 0 and 15 with pulse

widths of 0.4 and 1.4ns.

Frequency Modulation

Width Modulation

Phase Modulation

Power Spectral Density

We are able to select and

reject a specific range of

frequency such as from 4 to

6GHz while allowing all

other frequencies, shown in

below on the right. We want to thank Rabia Rassil, Professor Frederic Nabki’s

student, for helping us with understanding the IC chip,

teaching us PADS 9.5, and supervising the project.

The Roger’s transmission

line increased the output

signal’s amplitude by 65%.

When the transmitter sends at

a higher data rate, the power

consumption increases linearly.

Our IC chip has three types of fully functional

modulations: OOK, PPM and BPSK that uses

frequency, width and phase modulation, respectively.

As shown in the PSD spectrum, we are able to choose

to transmit at our desired frequencies from 3 to 8GHz.

The Institution of Engineering and Technology. (2012.) Ultra

Wideband.Available:http://www.theiet.org/resources/journals

/eletters/4811/non-stop-rejection.cfm

Future Work Implementing a functional UWB IR receiver

Design a newer version of the IC chip for the transmitter

Academic paper with the new results of the IC chip