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Computing

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Test System (bench equipment) allows us to interact with ... Output of Detector into oscilloscope =0 8mV. Berkeley: 1.6mW Tx, 0.4mW Rx. Speckled Computing ... – PowerPoint PPT presentation

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Title: Computing


1
Computing
Prototype Low Power RF Front End
Ian McGregor University of Glasgow Ultrafast
Systems Group ianmcg_at_elec.gla.ac.uk Supervisors
E. Wasige I. Thayne
2
Content of Presentation
  • Strategy
  • System overview
  • Circuits for OOK system
  • Other Circuits
  • Prototype ICs

Speckled Computing
3
Strategy
  • Test System (bench equipment) allows us to
    interact with Strathclyde Uni. at an early stage
  • Prototype hybrid circuit (cm)
  • Integrated circuit/MMIC (mm )

Speckled Computing
4
Conventional Superhet System
Mixers generally use LO powers of 0- 10dBm
(1-10mW)
Speckled Computing
5
On-Off Keying (OOK) System Overview
  • Data Waveform used to control Microwave
  • Oscillator

0 1 0
Data
Amplifier
Envelope Detector
Speckled Computing
6
Oscillator
  • The oscillator is switched off unless
  • there is a logic 1 This saves power
  • A new oscillator synthesis procedure
  • has been developed which gives
  • control over efficiency, spectral purity
  • and start up time

Speckled Computing
7
  • Rx board
  • Antenna and Detector (0W). 30mV output
  • With 0dBm transmit signal and 12cm
  • separation between antennas
  • Antenna, amplifier and Detector(7 mW) .
  • 0-175mV under above conditions

Circuits for OOK System
Speckled Computing
8
Circuits for OOK System
  • Tx board
  • Antenna and Oscillator(0.5mW)
  • Output power is approximately -10dBm
  • Received signal is -25dBm at 7cm separation
  • Efficiency is approx. 20
  • We hope to improve efficiency to 35 or
  • greater

Speckled Computing
9
Experiment
  • Tx board Power consumption0.5mW
  • Rx board Power consumption0W
  • Separation between antennas10cm
  • Output of Detector into oscilloscope
  • 0 8mV
  • Berkeley
  • 1.6mW Tx, 0.4mW Rx

Speckled Computing
10
Other Circuits
  • Mixer 9dB conversion loss
  • when RF2.46GHz and LO2.45GHz
  • Monocycle Generator 500pS
  • monocycle with good symmetry

Speckled Computing
11
Prototype ICs- Oscillator- 1.7x0.9mm
Speckled Computing
12
Prototype ICs-Amplifier-1.2x0.9mm-17dB Gain
Power Consumption Is 1.6mW (50nm HEMT) For
same Gain using NEC device, 20mW
Speckled Computing
13
Future Work
  • Prototype switch and put
  • Microstrip circuits onto one board
  • Optimise Microstrip circuits
  • Start Work on ICs
  • In depth questions
  • ianmcg_at_elec.gla.ac.uk

Speckled Computing
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