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New Focus 3211 User Manual

High-voltage amplifier
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Model 3211 User's Manual
High-Voltage Amplifier

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Summary of Contents for New Focus 3211

  • Page 1 Model 3211 User’s Manual High-Voltage Amplifier...
  • Page 2 NEW FOCUS, Inc. are registered trademarks of New Focus, Inc. Copyright 1999, New Focus, Inc. All rights reserved. 321101 Rev. B...

  • Page 3: Table Of Contents

    Contents Introduction Safety Operation Applications Appendix 1: Bandwidth Limitations Appendix 2: Operating Voltages & Fuses Specifications Warranty, Service, & Support...

  • Page 4: Introduction

    For instance, with the Model 400X Electro-optic Phase Modula- tors, the Model 3211 can be used to provide a lin- ear phase modulation of greater than π for fre- quencies up to 1 MHz. The amplifier can also pro-...

  • Page 5: Safety

    Safety The Model 3211 is a high-voltage amplifier capa- ble of putting out 200 V at 120 mA. Because of the high-voltage capabilities of the amplifier, proper precautions should be taken to avoid electrical shock. The unit is equipped with a High Voltage On/Off switch which acts independently of the AC power switch.

  • Page 6: Operation

    Operation The Model 3211 consists of a current-limited, high-voltage operational amplifier used in a summing-amplifier configuration. As shown in Fig.1, three signals are summed together at the input and amplified: DC offset, Input 1, and Input 2. The DC offset is adjustable from the front-panel potentiometer, and Input 1 and Input 2 come from the front-panel BNC jacks.
  • Page 7 Fig. 1 Block diagram of the Model 3211 High-voltage Amplifier. +200 V Switch DC Offset Current +200 V Out Limit High-Voltage Input 1 Output Current -200 V Out Input 2 Limit Switch -200 V Monitor High-Voltage On/Off...
  • Page 8 ±10 V peak. NOTE: OPERATING PRECAUTIONS The high-voltage operational amplifier in the Model 3211 can be permanently damaged if ther- mally stressed. Thermal stress occurs only if the unit is operated well into its current-limited mode for at least 5–10 minutes; the unit is adequately protected for all other conditions.
  • Page 9 Fig. 2 Front panel view of the Model 3211 Amplifier. High-Voltage Amplifier 3211 Made in U.S.A. High Voltage Outputs DC Offset On/Off Monitor -200 V +200 V Power Input 1 Input 2 High Voltage Output Caution: Up to 200 V Do not exceed 10 V peak on inputs NEW FOCUS, Inc.

  • Page 10: Applications

    Applications The Model 3211 was designed primarily to drive electro-optic modulators and piezo-electric transducers. However, you can use it as a general- purpose amplifier to drive any capacitive load less than 100 nF. The amplifier can be used in con- junction with a low-voltage source to create a broad-bandwidth, low-voltage modulator driver.
  • Page 11 Fig. 3 Driving an electro-optic amplitude modulator with the Model 3211 Amplifier. Optically-Chopped Models 1801, Amplitude Signal 1811, 2001,or 2001 Modulator Photoreceivers Laser YYY Phase Modulator 484X NEW FOCUS Inc. Mountain View, CA V= ±200 V Feussner Sample Polarizer Model 3211...

  • Page 12: Appendix 1

    RC filtering can limit the bandwidth even fur- ther, as described below. Slew Rate The slew rate of the Model 3211 is at least 700 V/µs. Thus, the maximum frequency of operation is dependent on the peak voltage. With a peak voltage...

  • Page 13: Current Limit

    Model 3211 for large capacitive loads and very small peak voltages. Summary When determining the maximum bandwidth of the Model 3211 for a known capacitive load and a desired peak voltage, the user must calculate the bandwidth determined by the slew rate (dominates...
  • Page 14 RC bandwidth determines the maximum bandwidth of the Model 3211. Four examples illustrating how to determine the maximum bandwidth follow. Example 1 (slew-rate-limited case) Peak voltage=200 V Load capacitance=10 pF 1.
  • Page 15 3. Closed-loop bandwidth: 1 MHz 4. RC bandwidth: 1/(2π×25×100x10 )=63.7 kHz Therefore, the maximum bandwidth is the small- est of the four, or 955 Hz. Example 3 (closed-loop-bandwidth- limited case) Peak voltage=100 V Load capacitance=100 pF 1. Slew-rate-limited bandwidth: 111 MHz/100=1.11 MHz 2.

  • Page 16: Appendix 2

    Appendix 2: Operating The Model 3211 can operate from 100, 120, 220, or Voltages 240 V AC with AC frequencies of 47–63 Hz. The and Fuses unit is configured at the factory for the standard AC voltage in the user’s country. To select a differ- ent operating voltage, please refer to Fig.
  • Page 17 Fig. 4 Model 3211 Amplifier voltage selection.

  • Page 18: Specifications

    Specifications Performance Bandwidth, 3 dB(C<100 pF) 1 MHz Slew Rate 700 V/µs Output Voltage ±200 V Voltage Gain Input Impedance 5.75 kΩ 25 Ω Output Impedance Max. Load Capacitance 0.1 µF Max. Output Current 120 mA Max. Input without Damage ±10 V peak Operating AC Voltage 100, 120, 220, or...

  • Page 19: Warranty, Service, & Support

    Service, & Support Warranty New Focus guarantees its products to be free of defects for one year from the date of shipment. This is in lieu of all other guarantees, expressed or implied, and does not cover incidental or conse- quential loss.

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