Stanford Research Systems SIM914 Operation And Service Manual Download Page 1 | Manualshive

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Operation and Service Manual

350 MHz Preamplifier

SIM914

Stanford Research Systems

Revision 1.8

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August 24, 2006

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Summary of Contents for SIM914

Page 1: ...Operation and Service Manual 350 MHz Preamplifier SIM914 Stanford Research Systems Revision 1 8 August 24 2006 ...

Page 2: ... 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 c Stanford Research Systems Inc 2003 2006 All rights reserved Stanford Research Systems Inc 1290 D Reamwood Avenue Sunnyvale CA 94089 USA Phone 40...

Page 3: ...ons 1 5 2 Calibration 2 1 2 1 General 2 2 2 2 Required Equipment 2 2 2 3 High Frequency Compensation 2 2 2 4 Offset Calibration 2 3 2 5 Gain Calibration 2 3 3 Circuit Description 3 1 3 1 Input Stage 3 2 3 2 Output Stage 3 2 3 3 Overload Detection 3 2 3 4 Power 3 3 3 5 Parts List 3 4 3 6 Schematic Diagrams 3 5 i ...

Page 4: ...ii Contents SIM914 350 MHz Preamplifier ...

Page 5: ...50 MHz DC coupled amplifier This chapter provides general instructions on its use In This Chapter 1 1 Description 1 2 1 2 Operation 1 3 1 3 SIM Interface Connector 1 3 1 3 1 Grounding 1 3 1 3 2 Direct Interfacing 1 4 1 4 Specifications 1 5 1 1 ...

Page 6: ... nV Hz The output is linear over 1 V and should be terminated into a 50 Ω load Output rise and fall times are 1 3 ns The output will recover from a 10 full scale overload within 3 ns The unit is protected from 50 V 1 µs input overloads The SIM914 is powered by 5 VDC from the SIM900 Mainframe There are three LEDs on the front panel The green LED indicates that power is present The red LEDs indicate...

Page 7: ...o the input the broadband noise 1 Hz to 300 MHz is 80 µVrms Peak to peak noise is typically 5 times the rms value This corresponds to about 10 mVpp at the output of two cascaded amplifiers 50 mVpp at the output of three cascaded amplifiers and 250 mVpp at the output of four cascaded amplifiers 1 3 SIM Interface Connector The DB 15 SIM Interface Connector provides power and overload monitoring to t...

Page 8: ...nst reverse polarity missing CAUTION supply or overvoltage on the power supply pins Misapplication of power may cause circuit damage SRS recommends using the SIM914 together with the SIM900 Mainframe for most applications The mating connector needed is a standard DB 15 receptacle such as Amp part 747909 2 or equivalent Clean well regulated sup ply voltages of 5 VDC must be provided with 5 V suppli...

Page 9: ...ropagation delay 2 7 ns Outputs into 50 Ω Source impedance 49 5 50 50 5 Ω Linear operation 1 0 1 0 V Overload level 1 3 1 3 V Limit level 1 6 1 6 V General Number of Channels 2 Operating temperature 0 40 C Weight 1 4 lbs Power 5 VDC Supply current 80 mA Dimensions 1 5 W 3 6 H 7 0 D Notes 1 The input bias current flows out of the unit creating a positive offset of about 150 µV on the 50 Ω input ter...

Page 10: ...1 6 Operation SIM914 350 MHz Preamplifier ...

Page 11: ...4 for optimum per formance The module should be warmed up for at least 15 minutes before making any adjustments In This Chapter 2 1 General 2 2 2 2 Required Equipment 2 2 2 3 High Frequency Compensation 2 2 2 4 Offset Calibration 2 3 2 5 Gain Calibration 2 3 2 1 ...

Page 12: ...he SIM914 2 Digital multimeter with 4 wire ohm measurement capability Agilent 34401 3 Oscilloscope with at least 300 MHz bandwidth 2 3 High Frequency Compensation The SIM914 uses an AD8009 current feedback amplifier in the out put stage The gain of the amplifier is controlled by the ratio of re sistors in the feedback network and the bandwidth is controlled by the Thevenin equivalent source impeda...

Page 13: ...C range 3 Adjust P101 Channel 1 OFFSET pot to null the output volt age 4 Verify that the output voltage shifts down by less than 2 5 mV when a 50 Ω terminator is placed on the input The voltage shift Vout 10 ib Rs where ib is the input bias current and Rs is the change in input source impedance here 25 Ω This confirms that the input bias current ib 10 µA 5 Repeat the procedure to null the output o...

Page 14: ...es a DC current as the test source it is important that the amplifier offset be nulled prior to performing the DC gain adjustment 1 Setup the DMM in the 4 wire resistance measurement mode 2 Apply the current output to the Channel 1 input via a 453 Ω in line resistor 3 Apply the unterminated Channel 1 output to the DMMs 4 wire sense input 4 Adjust P100 Channel 1 GAIN pot so that the DMM indi cates ...

Page 15: ...y in the SIM914 The two amplifier channels are identical This description uses ref erence designators in the top channel Channel 1 In This Chapter 3 1 Input Stage 3 2 3 2 Output Stage 3 2 3 3 Overload Detection 3 2 3 4 Power 3 3 3 5 Parts List 3 4 3 6 Schematic Diagrams 3 5 3 1 ...

Page 16: ...he channel to 5 when terminated into a 50 Ω load The output of U100 is passed to the next gain stage via R112 a 47 Ω resistor 3 2 Output Stage The next stage has a fixed gain of 5 with an adjustable offset and adjustable high frequency response The gain of U101 is set by R115 R116 The offset adjusted by P101 and injected by R117 is nulled at the factory The high frequency response of U101 is affec...

Page 17: ... the 3 9 V Zener diode when an overload occurs The status pin may be polled via the SIM900 Mainframe to detect overloads in the unit 3 4 Power The 5 VDC power supplies are filtered at the rear panel by L1 L3 C1 C2 again on the main PCB by L2 L4 C300 C301 and fi nally at each channel of the amplifier L100 L101 C110 C111 for the top channel and L200 L201 C210 C211 for the bottom chan nel Careful pow...

Page 18: ...14 7 01410 2 D301 D302 3 00425 LED R 2 SIM 1X BRACKET 7 00933 1 D303 3 00649 MBAW56L 2 SIM Module Cover 7 00932 1 J1 1 00367 DB15 GND 4 Foot 0 00188 SR550FOOT 4 J100 J101 J200 J201 1 00003 BNC 1 J311 TO J312 1 00483 Jumper 4X1 2 1 J2 J5 1 01042 Jumper 4X1 4 8 L1 L2 L3 L4 L100 L101 6 00236 BEAD L200 L201 2 P100 P200 4 00487 20 2 P101 P201 4 00011 10K 10T 4 R103 R104 R203 R204 4 01503 10K 2 P102 P20...

Page 19: ...3 6 Schematic Diagrams 3 5 3 6 Schematic Diagrams Schematic diagrams follow this page SIM914 350 MHz Preamplifier ...

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