Stanford Research Systems SIM914 Manuale operativo

Operation and Service Manual

350 MHz Preampliﬁer

SIM914

Stanford Research Systems

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 workman-

ship 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.

Stanford Research Systems, Inc.

1290–D Reamwood Avenue

Sunnyvale, CA 94089 USA

Phone: (408) 744-9040 •Fax: (408) 744-9049

www.thinkSRS.com •e-mail: [email protected]

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 InputStage......................... 3–2

3.2 OutputStage........................ 3–2

3.3 Overload Detection . . . . . . . . . . . . . . . . . . . . 3 – 2

3.4 Power............................ 3–3

3.5 PartsList.......................... 3–4

3.6 Schematic Diagrams . . . . . . . . . . . . . . . . . . . 3 – 5

ii Contents

SIM914 350 MHz Preampliﬁer

1 Operation

The SIM914 is a two-channel, 350 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

1–2 Operation

1.1 Description

The SIM914 is a two-channel, 350 MHz bandwidth, DC-coupled,

50 Ωampliﬁer 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 Ωload. 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

1.2 Operation 1–3

1.2 Operation

The SIM914 is typically installed in the SIM900 Mainframe, which

can accommodate up to eight SIM914s (plus one remote unit.) The

unit is on, as indicated by the front-panel Power LED, whenever the

mainframe has line power and is turned on.

The input impedance for each channel is 50 Ω. The DC input volt-

age must be limited to ±4 V to avoid damaging the ampliﬁer front-

end. The ampliﬁer is internally protected from 50 V transients of 1 µs

duration. The 50 Ωinput impedance is intended to terminate 50 Ω

coaxial cable such as RG-58.

The ampliﬁers perform well when cascaded due to their high input

return loss and ﬂat frequency response characteristics. Referenced to

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 the instrument. The connector signals are speciﬁed in

the table below.

Pin Name Description

1 SIGNAL GND Ground

2−STATUS Overload (TTL output, active low)

6−5V Power supply

8 PS RTN Ground

9 CHASSIS GND Chassis ground

13 +5V Power supply

Table 1.1: SIM Interface Connector pin assignments, DB-15. All other

pins are left unconnected on the SIM914.

1.3.1 Grounding

In the SIM914, all three ground lines (Pins 1, 8 & 9) are tied common

to the chassis, and also form the signal ground.

SIM914 350 MHz Preampliﬁer

1–4 Operation

1.3.2 Direct Interfacing

The primary connection to the SIM914 ˜

Ampliﬁer is the rear-panel

DB–15 SIM interface connector. Typically, the SIM914 is mated to

a SIM900 Mainframe via this connection, either through one of the

internal Mainframe slots, or the remote cable interface.

It is also possible to operate the SIM914 directly, without using the

SIM900 Mainframe. This section provides details on the interface.

The SIM914 has no internal protection against 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 supplied on

Pin 13 and −5 V supplied on Pin 6 (see Table 1.1). Ground may be

provided on any combination of Pins 1, 8 or 9. The −STATUS signal

may be monitored on Pin 2 for a low-going TTL-compatible output

indicating an ampliﬁer overload condition.

SIM914 350 MHz Preampliﬁer

1.4 Speciﬁcations 1–5

1.4 Speciﬁcations

Min Typ Max Units

Inputs (50 Ωsource) Input signal level −200 +200 mV

Impedance 49.5 50 50.5 Ω

Return loss 32 dB

Offset −500 +500 µV

Offset drift −10 +10 µV/◦C

Bias current (note 1) 3 10 µA

Protection (DC) −4+4 VDC

Protection (1µs transient) −50 +50 V

Recovery time (10×FS overload) 3 ns

Noise (10 Hz) 22 nV/√Hz

Noise (100 Hz) 8.6 nV/√Hz

Noise (>1 kHz) 5.2 nV/√Hz

Noise (1 Hz to 300 MHz BW) 80 µVrms

Crosstalk (CH1 out to CH2 in) −61 dB

Crosstalk (CH2 out to CH1 in) −82 dB

Ampliﬁer Gain (note 2) 4.95 5.00 5.05 V/V

Bandwidth (−3 dB) 350 MHz

Rise/fall time 1.3 ns

Propagation 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 Ωinput termination. This offset will be

affected by the DC impedance of the source that is connected to the

input.

2. Ampliﬁer gain is calibrated by applying a known current to the input

and measuring the voltage into a high impedance load. The gain

is adjusted so that a 1 mA source applied to the input produces a

500 mV voltage at the unloaded output.

SIM914 350 MHz Preampliﬁer

1–6 Operation

SIM914 350 MHz Preampliﬁer

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