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SRS Labs SR445A Manual

Srs sr445a preamplifier 350 mhz
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MODEL SR445A
350 MHz PREAMPLIFIER

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Summary of Contents for SRS Labs SR445A

  • Page 1 MODEL SR445A 350 MHz PREAMPLIFIER...
  • Page 2 MODEL SR445A 350 MHz PREAMPLIFIER 1290-D Reamwood Avenue Sunnyvale, California 94089 Phone: (408) 744-9040 • Fax: (408) 744-9049 email: info@thinkSRS.com • www.thinkSRS.com Copyright © 2004 by SRS, Inc. All Rights Reserved. Revision 1.1 (03/2006)

  • Page 3: Warranty

    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.

  • Page 5: Operation

    SR445A Quad Fast Amplifier Description The SR445A is a four-channel, 350MHz bandwidth, dc coupled, 50Ω amplifier with a gain of 5× (or +14dB) in a half-width 1U chassis. Two, three or four channels may be cascaded for gains of 25×, 125×, or 625×, (+28dB, +42dB, or +56dB.) The unit uses BNC connectors for inputs and outputs.
  • Page 6 SR445A Specifications Specification Units Inputs (driven by 50Ω source) Input signal level -200 +200 Impedance 49.5 50.5 Ω Return loss Offset -500 +500 µV Offset drift µV/°C Bias current (note 1) µA Protection (dc) Protection (1µS transient) Recovery time (10×FS overload) Noise (10Hz) nV/√Hz...

  • Page 7: Required Equipment

    3. Digital oscilloscope with at least 300MHz bandwidth. High Frequency Compensation The SR445A uses an AD8009 current feedback amplifier in the output stage. The gain of the amplifier is controlled by the ratio of resistors in the feedback network and the bandwidth is controlled by the Thevenin equivalent source impedance of the feedback network.

  • Page 8: Offset Calibration

    2. Adjust P102 (Channel 1 HF compensation pot) to match the output rise time and overshoot to the input rise time and overshoot. 3. Repeat for the remaining three channels, adjusting the pulse response with P202, P302 or P402. Offset Calibration The output offset is affected by the HF compensation and so the offset should be nulled after the HF compensation is adjusted.
  • Page 9 4. Adjust the gain pot (P100 for channel 1, P200 for channel 2, P300 for channel 3, and P400 for channel 4) so that the DVM indicates a “resistance” of 500Ω. 5. Verify that the offset was nulled by connecting the current source from the DVM to the input of the other channel and measuring a resistance of less than 1Ω.

  • Page 10: Circuit Description

    Circuit Description (The four amplifier channels are identical. This description uses reference designators for the top channel.) The input is terminated into 50Ω by the parallel combination of R100 & R101. The input signal is coupled via a 47Ω resistor to the high speed “clamp-amp”, U100. U100 is configured as a non-inverting gain of 2×...

  • Page 11: Power Supplies

    Power Supplies The unit operates from a universal input/single floating output power supply. The power supply can operate from AC mains with 90-132Vac or 175-264Vac between 47 & 63Hz and outputs 18Vdc. An “active ground” is generated by the op amp U501 together with Q500 &...
  • Page 12 SR445A Component parts list REF. # SRS P/N VALUE DESCRIPTION C 100 5-00299-568 Cap, Ceramic 50V SMT (1206) +/-10% X7R C 101 5-00299-568 Cap, Ceramic 50V SMT (1206) +/-10% X7R C 102 5-00299-568 Cap, Ceramic 50V SMT (1206) +/-10% X7R...
  • Page 13 REF. # SRS P/N VALUE DESCRIPTION C 501 5-00516-526 330U HIGH RIPPL Capacitor, Electrolytic, 35V, 20%, Rad C 502 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes) C 503 5-00516-526 330U HIGH RIPPL Capacitor, Electrolytic, 35V, 20%, Rad C 504 5-00472-569 4.7U/T35 Cap, Tantalum, SMT (all case sizes)
  • Page 14 REF. # SRS P/N VALUE DESCRIPTION L 501 6-00174-630 6611 TYPE 43 Ferrite Beads P 100 4-01614-441 Pot, Multi-Turn Trim, 3/8" Square Top Ad P 101 4-00011-441 Pot, Multi-Turn Trim, 3/8" Square Top Ad P 102 4-00353-441 Pot, Multi-Turn Trim, 3/8" Square Top Ad P 200 4-01614-441 Pot, Multi-Turn Trim, 3/8"...
  • Page 15 REF. # SRS P/N VALUE DESCRIPTION R 204 4-01503-461 Thick Film, 5%, 200 ppm, Chip Resistor R 205 4-01021-462 Thin Film, 1%, 50 ppm, MELF Resistor R 206 4-01134-462 1.50K Thin Film, 1%, 50 ppm, MELF Resistor R 207 4-01021-462 Thin Film, 1%, 50 ppm, MELF Resistor R 208 4-01134-462...
  • Page 16 REF. # SRS P/N VALUE DESCRIPTION R 328 4-01551-461 1.0M Thick Film, 5%, 200 ppm, Chip Resistor R 400 4-01021-462 Thin Film, 1%, 50 ppm, MELF Resistor R 401 4-01021-462 Thin Film, 1%, 50 ppm, MELF Resistor R 402 4-01447-461 Thick Film, 5%, 200 ppm, Chip Resistor R 403 4-01503-461...
  • Page 17 Switch, Rocker 6-00626-615 18V-15WATT Power Supply 7-00167-720 SR445A Fabricated Part 7-00349-720 SR445A Fabricated Part 7-00380-721 SR445A/SR240A Machined Part 7-01480-720 SR445A, RCK MT Fabricated Part 7-01481-709 SR445A Lexan Overlay 7-01482-720 SR445A Fabricated Part 7-01622-720 SR445A MYLAR Fabricated Part 9-00267-917 GENERIC Product Labels...

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