artisan FS730 (Single) Operation manual

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Operation and Service Manual
FS730 (Single) & FS735 (Dual)
Distribution Amplifiers
1290-D Reamwood Avenue
Sunnyvale, California 94089
Phone: [phone] • Fax: [phone]
email: inf[email protected] • www.thinkSRS.com
Copyright © 2008,2012, by SRS, Inc.
All Rights Reserved.
Version 1.2 (11/2012)
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ii Distribution Amplifiers
Certification
Stanford Research Systems certifies that this product met its published specifications at the
time of shipment.
Warranty
This Stanford Research Systems product is warranted against defects in materials and
workmanship for a period of one (1) year from the date of shipment.
Service
For warranty service or repair, this product must be returned to a Stanford Research Systems
authorized service facility. Contact Stanford Research Systems or an authorized
representative before returning this product for repair.
Information in this document is subject to change without notice.
Copyright © Stanford Research Systems, Inc., 2005. All rights reserved.
Stanford Research Systems, Inc.
1290-C Reamwood Avenue
Sunnyvale, California 94089
Phone: [phone]
Fax: [phone]
www.thinkSRS.com
Printed in U.S.A.
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iiiDistribution Amplifiers
Table of Contents
Introduction
1 Overview
3 Amplifier options
10MHz Distribution Amplifier (Opt 1)
7 Overview
8 Specifications
11 Checkout
11 Calibration
12 Circuit description
14 Component parts list
5MHz Distribution Amplifier (Opt 2)
21 Overview
22 Specifications
23 Checkout
23 Calibration
CMOS Logic Distribution Amplifier (Opt 3)
27 Overview
28 Specifications
29 Checkout
29 Calibration
30 Circuit description
31 Component parts list
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iv Distribution Amplifiers
Table of contents (continued)
Broadband 50Distribution Amplifier (Opt 4)
37 Overview
38 Specifications
41 Checkout
41 Calibration
42 Circuit description
44 Component parts list
Broadband 75Distribution Amplifier (Opt 5)
51 Overview
52 Specifications
53 Checkout
53 Calibration
54 Component parts list
SDI (Serial Digital Interface) Distribution Amplifier (Opt 6)
61 Overview
62 Specifications
63 Component parts list
Model numbers and chassis configurations (FS730 & FS735)
67 Overview
68 FS730 Component parts list
70 FS735 Component parts list
Schematic Diagrams
73 Option 1-5
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vDistribution Amplifiers
Safety and Preparation for Use
Line Voltage
The FS730 & FS735 operate from a 90 to 132 VAC or 175 to 264 VAC power source
having a line frequency between 47 and 63 Hz.
Power Entry Module
A power entry module on the back panel of the instruments provides connection to the
power source and to a protective ground.
Power Cord
A detachable, three-wire power cord for connection to the power source and protective
ground is provided.
The exposed metal parts of the box are connected to the power ground to protect against
electrical shock. Always use an outlet which has a properly connected protective ground.
Consult with an electrician if necessary.
Grounding
BNC shields are connected to the chassis ground and the AC power source ground via the
power cord. Do not apply any voltage to the shield.
Line Fuse
The line fuse is internal to the instrument and may not be serviced by the user.
Operate Only with Covers in Place
To avoid personal injury, do not remove the product covers or panels. Do not operate the
product without all covers and panels in place.
Serviceable Parts
The FS730 & FS735 do not have any user serviceable parts inside. Refer service to a
qualified technician.
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vi Distribution Amplifiers
Symbols you may Find on SRS Products
Symbol Description
Alternating current
Caution - risk of electric shock
Frame or chassis terminal
Caution - refer to accompanying documents
Earth (ground) terminal
Battery
Fuse
On (supply)
Off (supply)
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1Distribution Amplifiers
Introduction
Distribution amplifiers are used to create several copies of a signal. There are many
application areas and each requires different amplifier characteristics. In each application the
amplifier is selected to preserve, improve (or minimally degrade) the input signal’s
bandwidth, amplitude, pulse shape, phase noise and jitter characteristics.
SRS distribution amplifiers are available in two chassis form factors:
The FS730 is a half-width, 1U high chassis that holds one distribution amplifier with BNC
connectors and indicator LEDs on the front panel. The power cord is on the back panel. Two
FS730s may be mounted side-by-side in a 19” rack using the optional rack mount accessory.
Figure 1. Front panel of FS730 (10MHz distribution amplifier shown here)
Figure 2. Rear panel of FS730 Distribution amplifier.
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2 Distribution Amplifiers
The FS735 is a full-width, 1U high chassis that can hold two distribution amplifiers. The
BNCs and power cord are on the rear of the instrument. The indicator LEDs are on the front
panel of the instrument.
Figure 3. Front panel of FS735 dual, rack-mounted, distribution amplifiers
Figure 4. Rear panel of FS735 dual, rack-mounted, distribution amplifiers.
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3Distribution Amplifiers
Distribution amplifier options
10 MHz and 5 MHz distribution amplifiers.
It is common to distribute a 10 MHz or 5 MHz frequency reference (from a rubidium or
cesium oscillator, for example) throughout a facility. This frequency reference is used as the
timebase for instruments in test & measurement, broadcast, telecommunication or basic
research applications.
A distribution amplifier used in this application should provide sine wave outputs, amplitude
leveling, low additive phase noise, low spur levels, narrow bandwidth, high channel-to-
channel isolation, small phase variation with temperature, and high return loss on all 50
inputs and outputs.
CMOS Logic distribution amplifier.
A CMOS Logic distribution amplifier has one logic-level input and several outputs. A typical
application is the distribution of a 1 pulse-per-second timing mark from a GPS receiver or an
8kHz frame clock for telecommunications.
There are no established standards for sending 5 V logic pulses over 50coax. Standard
logic ICs are not designed to drive 50 loads. To avoid problems, a logic distribution
amplifier should have the following characteristics: high input impedance with hysteresis,
high current outputs with 50 source impedance, fast transition times, small overshoot,
small ground bounce, small insertion delay and low channel-to-channel timing skew.
Broadband 50 and 75 distribution amplifiers.
Broadband distribution amplifiers have one analog input and several analog outputs. A wide
bandwidth allows these distribution amplifiers to be used in many applications including the
distribution of frequency references, IRIG timing signals, composite video, audio, etc.
Typically test & measurement and research applications will use 50 inputs and outputs
while video and broadcast applications will use the 75 version.
Important characteristics of broadband amplifiers include input protection, wide bandwidth
(including dc), flat frequency response, large dynamic range, low offset voltage, low noise,
high slew rate, and low distortion. Outputs should have high current compliance and accurate
50 or 75 output impedance for high return loss. Composite video applications require
low differential gain and low differential phase errors to prevent color shifts or color
saturation changes verses luminance levels.
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4 Distribution Amplifiers
SDI distribution amplifier
SDI (serial digital interface) is a physical interface used to transmit uncompressed component
digital video in a variety of formats. There are several standards defined by the Society of
Motion Picture and Television Engineers (SMPTE) which transmit 800 mVpp logic over 75 
coax at rates up to 2.97Gb/s.
Cable attenuation and dispersion degrade SDI signals. Two techniques are used to restore
signals: equalization and reclocking. Equalization circuits modify the frequency response of
the input amplifier to compensate for the cable losses at high frequencies. Reclocking circuits
recover the data clock (by phase locking a local oscillator to transitions in the data stream)
and resynchronize the output data to this recovered clock.
Important characteristics of an SDI distribution amplifier include input cable equalization,
agile clock recovery and resynchronization, good matching of the 75 cable impedance to
both inputs and outputs, fast output transition times, small overshoot, and compliance with
common data rates (270, 1483.5, 1485, 2967 and 2970 Mb/s).
More in development
Other distribution amplifiers, which are compatible with the FS730 & FS735 systems, are
currently in development. Check the SRS web site, www.thinkSRS.com, for current
information.
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510MHz Distribution Amplifiers
10MHz Distribution Amplifier
(Option 01)
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6 10 MHz Distribution Amplifiers
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710MHz Distribution Amplifiers
10 MHz distribution amplifier (Option 1)
Figure 5. Single 10MHz Distribution amplifier, FS730/1.
The FS735 dual distribution amplifier is also available.
Overview
This distribution amplifier is intended to distribute a low noise 10 MHz frequency reference.
The amplifier has one input and seven outputs, all on BNC connectors. The input is coupled
through a series LC network allowing the use of inputs with a dc offset. The input source
impedance is 50 Ωat 10 MHz.
The input is conditioned by a limiter. The limiter provides several advantages in this
application; amplitude modulation is removed from the input signal, outputs have fixed
amplitude, input noise that occurs more than 50 mV away from the zero-crossing is blocked,
and virtually any waveform with a duty cycle near 50% may be used as an input.
The input limiter is followed by a bandpass filter and a fixed gain amplifier. This signal is
passed to seven output amplifiers, each of which is followed by a low pass filter and an
output transformer. All of the outputs have 50 Ωsource impedance and provide a 1Vrms
(+13 dBm) sine wave into a 50 Ωload.
There are four indicator LEDs. The “power” LED indicates that the unit has ac power. The
“signal” LED indicates that an input signal is present. The “overload” LED indicates that the
input signal has excessive amplitude. The “fault” LED indicates one or more of these
conditions: no input signal, excessive input signal, or low internal dc power supply.
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8 10 MHz Distribution Amplifiers
Specifications
Input
Frequency 10 MHz, ±1%
Level 0 dBm to +16 dBm
(0.6Vpp to 4Vpp)
Waveform Any with 50% duty
Impedance 50 , ±5% at 10 MHz
Coupling Series LC. (Open at dc)
Outputs
Waveform Sine
THD <1%
Level (50 load) +13±1 dBm (1 VRMS, 2.82 VPP)
Level (high-Z load) 2 VRMS (5.6 VPP)
Impedance 50 , ±5% at 10 MHz
Coupling Transformer. (Short at dc)
Bandwidth ±200 kHz (-3 dB)
Spurious < 120 dBc within 100 kHz
Isolation > 100 dB (1)
Pulling < 1 ps
(1, 2)
TC of phase 5 ps/°C
(1) Measured with 1Vrms at 10.001 MHz from a 50 source applied to an adjacent
output. The isolation increases at frequencies far away from 10 MHz.
(2) The pulling is comparable to that caused by a reflected wave from an unterminated
cable on an adjacent output.
Additive phase noise
(with +7 dBm input)
Offset Noise (typ)
(Hz) (dBc/Hz)
1 125
10 135
100 146
1k 155
10k 158
100k 158
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910MHz Distribution Amplifiers
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Figure 6 . The 10MHz Distribution amplifier input limiter characteristic.
Figure 7. The 10MHz distribution amplifier, output power vs. frequency.
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10 10 MHz Distribution Amplifiers
Figure 8. The 10MHz Distribution amplifier sine wave output.
Figure 9. The 10MHz Distribution amplifier additive phase noise vs offset frequency.
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1110MHz Distribution Amplifiers
Test and calibration.
Check out. With the instrument plugged into an ac power source and turned “on”, apply a
10MHz (±1kHz or ±100ppm), 1.41VPP (+7dBm or 0.5 VRMS) sine wave to the 50input.
Verify that each of the seven outputs provides a clean sine wave output of 2.82VPP on an
oscilloscope when driving a 50load.
The output amplitude should decrease by a few percent when the input is changed to 9.9MHz
or 10.1MHz. The SIGNAL LED should go “off” if the amplitude is reduced below 0.4VPP.
The OVERLOAD LED should go “on” when the input is increased above 5.2 VPP (but do not
exceed 6 VPP while testing).
Calibration. With the instrument plugged into an ac power source and turned “on”, apply a
10MHz (±1kHz or ±100ppm), 1.41VPP (+7dBm or 0.5 VRMS) sine wave to the 50input.
1. Adjust the core of the tuned transformer (T101) to maximize the amplitude of the
Channel 1 output when driving a 50load.
2. Adjust the amplitude control pot (P100) for 2.82VPP (+13dBm or 1.00 VRMS) sine
wave amplitude on the Channel 1 output when driving a 50load.
3. Verify that 10MHz is present at each of the seven outputs.
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12 10 MHz Distribution Amplifiers
Circuit Description
10MHz distribution amplifier
(Refer to schematics FS1_1B and FS1_2B)
This distribution amplifier is intended to distribute a low noise 10 MHz frequency reference.
The amplifier has one input and seven outputs, all on BNC connectors.
Power. The unit is powered from a universal input, +24Vdc power supply. Passive L-C
filters (L100, L101, C100, C101) are used to remove switching noise from the +24V. The
power supply is regulated by a low drop-out regulator (U100) to provide a clean +22Vdc
supply.
Input. The user-supplied 10MHz is applied at J102. A low-Q, series resonant L-C circuit
(C109, C110, L102) is used to ac couple and band-pass the input signal and drive the primary
of the transformer T100. The transformer doubles the amplitude of the input signal to
improve the input noise figure. The transformer input impedance is about 50(R113 divided
by the square of the turns ratio of T100). The inductor, L103, compensates for the input
capacitance of the transistor pair, Q100 &Q101.
Limiter. The balanced output from T100 drives the input to the differential pair/limiter
(Q100 & Q101). The limiter amplitude is set by the constant current source, Q102, which has
4.096 V across its 1.24kemitter resistor to provide 3.3mA of collector current. Q103 is
used to temperature compensate the base-emitter voltage (0.65V) across Q102. The R-C
filter, R133 & C117, has a 0.5Hz cutoff frequency to filter residual voltage reference noise.
The output from the limiter is a differential square wave of 3.3mA. The limiter has relatively
high gain: the output will reach about 90% of full scale for inputs greater than 200mVpp.
This signal is applied to the primary of the tuned transformer, T101. This transformer is a
10.7MHz intermediate frequency transformer (IFT) that has been tuned down to 10MHz by
C112 and C113. The turns ratio of T101 is 7:1 and so the input impedance is about
72×249=12.2k. The output from T101 has an amplitude of about 5.4Vpp. The output is a
relatively low distortion sine wave owing to the high-Q of the IFT.
Amplifier. The output of T101 is amplified by U102, which has a nominal gain of ×2.4 to
provide an output of about 13Vpp. This output drives the seven buffer amplifiers which
provide the seven output channels of the distribution amplifier. It also drives the output
amplitude peak detector, D101 & C121.
Buffer Amplifiers. There are seven identical output amplifiers. This description will refer to
the reference designators for the channel 1 output. The buffer amplifier consists of three
emitter followers, Q210, Q211 and Q212. The emitter followers are connected in series to
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1310MHz Distribution Amplifiers
provide very large channel-to-channel isolation. The emitter of the third follower drives a 2:1
output transformer via a series R-C (R219 & C212) to reduce the output impedance by 4:1 in
order to drive a 50Ωload. The 50Ωuser load is driven via a low-pass filter. The filter has a
pass-band to 11.5MHz and a notch at 20MHz in order to eliminate harmonic distortion at the
output.
Status LEDs. The input level detector is used to detect signal levels which are too small or
too large. The detector, D100, is a dual Schottky diode that is biased “on” by R104, R105
and R107. (Biasing the detector “on” improves its ability to detect low signal levels.) The
output of the level detector is compared with fixed thresholds by two comparators (U101).
The SIGNAL LED will be “on” for inputs greater than about 500mVpp and the OVERLOAD
LED will be “on” if the input signal exceeds about 5Vpp. The user supplied 10MHz input
should be somewhere between these two levels.
The FAULT LED is controlled by U104 & U105 which turns the LED “on” if any of the
following conditions exist: no signal at the input, overload at the input, +22V supply is below
+20.5V.
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