MOGlabs ARF021 Manual de usuario
Agile RF Synthesizer & AOM driver
ARF021/ARF421, XRF021/XRF421
Revision 0.0.1
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MOG Laboratories Pty Ltd (MOGLabs) does not assume any liabil-
ity arising out of the use of the information contained within this
manual. This document may contain or reference information and
products protected by copyrights or patents and does not convey
any license under the patent rights of MOGLabs, nor the rights of
others. MOGLabs will not be liable for any defect in hardware or
software or loss or inadequacy of data of any kind, or for any direct,
indirect, incidental, or consequential damages in connections with
or arising out of the performance or use of any of its products. The
foregoing limitation of liability shall be equally applicable to any
service provided by MOGLabs.
Copyright
Copyright c
MOG Laboratories Pty Ltd (MOGLabs) 2015. No part
of this publication may be reproduced, stored in a retrieval system,
or transmitted, in any form or by any means, electronic, mechanical,
photocopying or otherwise, without the prior written permission of
MOGLabs.
Contact
For further information, please contact:
MOG Laboratories P/L
18 Boase St
Brunswick VIC 3056
AUSTRALIA
+61 3 9939 0677
www.moglabs.com
MOGLabs USA LLC
419 14th St
Huntingdon PA 16652
USA
+1 814 251 4363
www.moglabsusa.com
MOGLabs Europe
Goethepark 9
10627 Berlin
Germany
+49 30 21 960 959
Preface
Acousto-optic modulators (AOMs) are an integral part of many laser-
based experiments. They are used for frequency shifting, amplitude
modulation, and laser frequency stabilisation. Many experiments re-
quire very simple control of the RF frequency and power, but others
require sophisticated sequences. The MOGLabs ARF/XRF agile RF
synthesizer provides such complexity with a user-friendly interface.
The extraordinary capabilities of the ARF/XRF have not previously
been available from any single supplier, let alone in a single unit.
Two channels, with direct output of up to 4 W per channel. Wide
frequency range of 20 to 400 MHz. Arbitrary frequency, amplitude
and phase with high resolution. Analogue modulation of each chan-
nel, in frequency, amplitude, and/or phase, with 10 MHz bandwidth.
Ergonomic front-panel controls, and ethernet/USB interface. Table-
mode operation to define complex time-dependent waveform output.
All in one box which connects directly to AC mains power and to
your AOMs. As you delve into this manual you will uncover more and
more capability, but the powerful FPGA at the heart of the ARF/XRF
allows software improvements to add new features, so please check
the MOGLabs website for updates, example code, and assistance.
We hope that you enjoy using the ARF/XRF, and please let us know
if you have any suggestions for improvement in the ARF/XRF or in
this document, so that we can make life in the lab better for all.
MOGLabs, Melbourne, Australia
www.moglabs.com
i
ii
Safety Precautions
Safe and effective use of this product is very important. Please read
the following safety information before attempting to operate. Also
please note several specific and unusual cautionary notes before
using the MOGLabs ARF/XRF, in addition to the safety precautions
that are standard for any electronic equipment.
CAUTION To ensure correct cooling airflow, the unit should not be oper-
ated with cover removed.
WARNING High voltages are exposed internally, particularly around the
mains power inlet and internal power supply unit. The unit
should not be operated with cover removed.
NOTE The MOGLabs ARF/XRF is designed for use in scientific re-
search laboratories. It should not be used for consumer or
medical applications.
iii
Protection Features
The MOGLabs ARF/XRF includes a number of features to protect you
and your device.
Open/short circuit Each RF output should be connected to a 50 Ωload. The
ARF/XRF will disable the each high-power RF output if not
connected or if a short-circuit is detected.
Reflected power The RF reflected power and VSWR (voltage standing wave
ratio) are monitored and RF output is disabled if either exceeds
their safe limit settings.
Mains filter Protection against mains transients.
Temperature Several temperature sensors control the fan and shutdown if
the temperature exceeds a safe limit.
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Contents
Preface i
Safety Precautions iii
Protection Features iv
1 Introduction 1
1.1 Operatingmodes ..................... 2
1.2 Tabletiming........................ 4
1.3 RF on/offcontrol ..................... 4
2 Connections and controls 5
2.1 Front panel controls . . . . . . . . . . . . . . . . . . . 5
2.2 Front panel display/monitor . . . . . . . . . . . . . . . 5
2.3 Rear panel controls and connections . . . . . . . . . . 6
3 Communications 9
3.1 TCP/IP........................... 9
3.2 USB ............................ 11
4 Programming 13
4.1 python example...................... 13
A Specifications 17
B Command language 19
B.1 Primary RF control.................... 19
B.2 Complex functions . . . . . . . . . . . . . . . . . . . . 20
B.3 Modulation control . . . . . . . . . . . . . . . . . . . . 21
B.4 General functions . . . . . . . . . . . . . . . . . . . . . 21
B.5 Display functions . . . . . . . . . . . . . . . . . . . . . 22
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vi Contents
B.6 Auxilliary measurements . . . . . . . . . . . . . . . . . 22
B.7 Configuration settings . . . . . . . . . . . . . . . . . . 23
C Ugrading firmware 25
D Connector pinouts 27
D.1 IOconnector........................ 27
D.2 High-speed digital . . . . . . . . . . . . . . . . . . . . 28
References 29
1. Introduction
The MOGLabs ARF/XRF consists of two independent AD9910 direct
digital synthesizer (DDS) sources, each with 4 W amplifier. The fre-
quency, amplitude and phase of each output is software-controlled
via a microcontroller and FPGA (field programmable gate array). The
frequency, amplitude and phase can be defined via front-panel con-
trol knobs, or via ethernet or USB. The RF parameters can be defined
in a lookup table (loaded via ethernet or USB) to enable complex se-
quences with very fast transitions.
The block diagram below shows the key components of the ARF/XRF.
The RF signal output from each (DDS) is low-pass filtered, pre-
amplified, and then further amplified with a GaN hybrid high-power
FPGA
Front Panel Display & Control
Local
Oscillator
Micro
controller
DDS + RF
AD9910 DDS
LP lter
RF amplier
Power detector
DAC
Output
A/D
(2 per channel)
RF on/o
7-pole lters
10MHz
External
Clock
Ethernet
10/100
RAM table
memory
USB
RF OUT
MOD IN
1
2Chapter 1. Introduction
output stage (ARF421/XRF421 only). The RF signals are monitored to
check output power and to measure the reflection (VSWR).
The DDS chips are controlled by the FPGA. A microcontroller provides
external interface with TCP/IP and USB communications, and controls
the front-panel display, rotary encoders (knobs) and push-buttons.
The device allows analogue modulation through two analogue-to-
digital converters (ADC) with anti-aliasing filters. When modulation
is configured, the FPGA periodically reads the digital value of the
modulation signal and uses that value to reprogram the DDS fre-
quency, power and/or phase.
The ARF/XRF includes memory for storing complex waveform se-
quences, where each step in the sequence can include frequency,
power, phase, time delay, and more complex definitions of ramps
and other time-dependent functions. Complex capabilities can be
accessed via either TCP/IP or USB communications. See Chapter 3
for information on communications options and setup.
Once communications are established, the ARF/XRF can be controlled
with simple text commands. The commands can be very basic, for
example to define the frequency or power, or they can define complex
dynamic sequences. Chapter 4 describes some example python code
for communicating with the device and for establishing a sequence,
and Appendix B provides a summary of the available commands.
1.1 Operating modes
The ARF/XRF can be used at varying levels of complexity, defined
in terms of operating modes. In normal mode, the ARF/XRF acts as
a simple single-frequency high-power RF source, controlled by the
front panel or computer commands.
In table mode, the RF output is determined by a table of commands
preloaded into internal look-up tables and stepped through auto-
matically on the basis of pre-defined delays, in combination with
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