Stanford Research Systems SIM914 Operation And Service Manual

Operation and Service Manual

Stanford Research Systems

350 MHz Preamplifier

SIM914

Revision 1.8 • August 24, 2006

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.

Copyrightc Stanford Research Systems, Inc., 2003, 2006. All rights reserved.

Stanford Research Systems, Inc.
1290–D Reamwood Avenue
Sunnyvale, CA 94089 USA
Phone: [phone] • Fax: [phone]

www.thinkSRS.com • e-mail: [e-mail]

Printed in U.S.A. Document number 9-01546-903

SIM914 350 MHz Preamplifier

Contents

1 Operation 1 – 1

1.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 2

1.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . 1 – 3

1.3 SIM Interface Connector . . . . . . . . . . . . . . . . . 1 – 3

1.4 Specifications . . . . . . . . . . . . . . . . . . . . . . . 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

ii Contents

SIM914 350 MHz Preamplifier

1 Operation

In This Chapter

The SIM914 is a two-channel, 350 MHz, DC-coupled amplifier. This
chapter provides general instructions on its use.

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

1 – 2 Operation

1.1 Description

The SIM914 is a two-channel, 350 MHz bandwidth, DC-coupled,
50 Ω amplifier with a gain of 5× (+14 dB). The two channels may be
cascaded for a gain of 25× (+28dB). The unit uses BNC connectors
for inputs and outputs (see Figure 1.1). A rear panel DB-15 connector
provides power to the unit.

Figure 1.1: The SIM914 front and rear panels.

The full scale input is ±200 mV. The input noise (above 1 kHz) is
typically 5.2 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 that the output signal
for the corresponding channel is outside its linear range, typically
±1.3 VDC. Brief overloads (<5 ns) trigger a 10 ms flash and will set
the overload status bit in the mainframe.

SIM914 350 MHz Preamplifier