Stanford Research Systems SIM954 Manuale operativo

Operation and Service Manual

300 MHz Dual Inverting Driver Ampliﬁer

SIM954

Stanford Research Systems

Revision 1.01 •February 4, 2010

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 9-01649-903

SIM954 300 MHz Dual Inverting Driver Ampliﬁer

Contents

General Information iii

Safety and Preparation for Use . . . . . . . . . . . . . . . . iii

Notation ............................. iii

Speciﬁcations .......................... iv

1 Operation 1 – 1

1.1 QuickStart......................... 1–2

1.2 Operation Inside the SIM900 Mainframe . . . . . . . . 1 – 2

1.3 Operation Using an External Power Supply . . . . . . 1 – 3

1.4 Interfaces.......................... 1–3

2 General properties 2 – 1

2.1 DC Characteristics . . . . . . . . . . . . . . . . . . . . 2 – 2

2.2 AC Characteristics . . . . . . . . . . . . . . . . . . . . 2 – 4

2.3 Noise ............................ 2–8

2.4 Crosstalk.......................... 2–9

2.5 Isolation .......................... 2–10

2.6 Power Supply and Thermal Considerations . . . . . . 2 – 12

3 Application notes 3 – 1

3.1 Resistive Loads . . . . . . . . . . . . . . . . . . . . . . 3 – 2

3.2 Capacitive Load Handling . . . . . . . . . . . . . . . . 3 – 3

3.3 Inductive Loads . . . . . . . . . . . . . . . . . . . . . . 3 – 5

3.4 Transformers........................ 3–8

3.5 Load Impedance Matching Examples . . . . . . . . . 3 – 10

3.6 Bridge Conﬁguration . . . . . . . . . . . . . . . . . . . 3 – 11

3.7 Typical Application: a High Voltage Isolated, Low

Noise, DC-DC Converter . . . . . . . . . . . . . . . . . 3 – 12

3.8 Common Mode EMI/EMF ................ 3–16

3.9 Overdrive Behavior . . . . . . . . . . . . . . . . . . . . 3 – 18

3.10 Miscellaneous Loads . . . . . . . . . . . . . . . . . . . 3 – 20

4 Calibration 4 – 1

4.1 GettingReady....................... 4–1

4.2 Oﬀset Voltage and Input Bias Current . . . . . . . . . 4 – 1

ii Contents

5 Circuitry 5 – 1

5.1 Circuit Description . . . . . . . . . . . . . . . . . . . . 5 – 2

5.2 PartsLists ......................... 5–4

5.3 Schematic Diagrams . . . . . . . . . . . . . . . . . . . 5 – 7

SIM954 300 MHz Dual Inverting Driver Ampliﬁer

General Information

The SIM954 300 MHz Ampliﬁer, part of Stanford Research Systems’

Small Instrumentation Modules family, is a dual, inverting, precision

wideband ampliﬁer with up to ±10 V output voltage and 1 A output

current.

The module can be used to drive many types of light laboratory loads

which exceed the capacity of typical instrument outputs without

imposing the limitations and cost of typical high power RF ampliﬁers.

Safety and Preparation for Use

The front-panel BNCs are all grounded to Earth ground, the power-

line-outlet ground, and the metal chassis of the module. No danger-

ous voltages are generated by the SIM954. However, if a dangerous

voltage is externally applied to the module, it may be present on all

BNC connectors, the chassis, the SIM interface connector, and may

cause injury or death.

The SIM954 is a single-wide module designed to be used inside the

SIM900 Mainframe. Do not turn on the power until the module is

completely inserted into the mainframe and locked in place.

iii

iv General Information

Speciﬁcations

Performance Characteristics

Property Min Typ Max Remarks

Gain −4 (12dB) 3% max. gain error

-3dB Bandwidth 300 MHz small signal

Gain Flatness 1 dB DC to gain peak

Crosstalk −60 dB at 1 MHz

−40 dB full BW

VSWR 1.2 : 1 DC to 100 MHz

1.6 : 1 DC to 300 MHz

Isolation −70dB Output to input DC to 1MHz

−40dB Output to input DC to 300MHz

Slew Rate 4000 V/µs

Output Amplitude 10 V into 50 Ω

Peak Output Current 1 A into ≤7Ω

Average Output Current 500 mA one channel or sum of both channels

Output Impedance 3.3 Ω

Input Impedance 50 Ω

Input Oﬀset Voltage 1 mV user trimmable

Input Bias Current 10 µA user trimmable

Operating Temperature 0 40◦C

Power Supply Voltages −15 V,+15 V

Supply Current ±1 A Internally current limited

Table 1: SIM954 Speciﬁcations

SIM954 300 MHz Dual Inverting Driver Ampliﬁer

1 Operation

Following is a short overview on general guidelines for the operation

of the SIM954.

In This Chapter

1.1 QuickStart ........................ 1–2

1.2 Operation Inside the SIM900 Mainframe . . . . . . . 1 – 2

1.3 Operation Using an External Power Supply . . . . . 1 – 3

1.4 Interfaces ......................... 1–3

1.4.1 SIM Interface Connector . . . . . . . . . . . . . 1 – 4

1.4.2 Direct Interfacing . . . . . . . . . . . . . . . . . 1 – 5

1–1

1–2 Operation

1.1 Quick Start

The SIM954 contains two mostly independent, identical small RF

power ampliﬁers with a gain of −4 (12dB) into 50Ωand a −3dB

bandwidth of 300MHz. The output voltage limit of ±10Vcan be

achieved with a modest ±2.5Vinput voltage, so most test equipment

can drive a SIM954 channel to its voltage and power limits.

The module was speciﬁcally designed to drive laboratory loads like

magnetic coils, capacitors, piezoelectric and electrochemical cells,

small motors, heaters etc.. While these loads often require currents

and voltages beyond the range of many test instruments, driving

them with expensive and bulky power ampliﬁers generally does not

represent a satisfactory and eﬃcient solution.

Unlike many power ampliﬁers, the SIM954 can operate as a precise

DC ampliﬁer, wideband RF ampliﬁer and driver stage for diﬃcult

passive loads like ceramic capacitors and high Q resonant circuits. It

will stay unconditionally stable under a variety of load conditions,

and its speciﬁcations will deteriorate in a predictable manner.

The two otherwise independent ampliﬁer channels share a common

power supply and are limited by the total power consumption per-

missible for a single wide SIM module. See section 2.6 on page 2 –

12 for further discussion.

1.2 Operation Inside the SIM900 Mainframe

The SIM954 is primarily designed to work inside a SIM900 main-

frame. Like all other SIM modules, it should not be hot-plugged or

removed under power.

Because of their higher current requirements, the number of SIM954

operated in a single SIM900 mainframe should be limited to a max-

imum of four. The modules should be separated by at least one slot

from each other, and any other module next to a SIM954 should not

have an increased power consumption itself.

SIM modules with higher power consumption, like the SIM965 Ana-

log Filter and the SIM940 Rubidium Frequency Standard, should not

be operated next to a SIM954 .

Running at its power limit, a SIM954 can heat up to approximately

50◦C. Some low power SIM modules like the SIM928 Battery Isolated

Voltage Source (because of its temperature sensitive NiMH batteries),

can not tolerate these temperatures and should not be operated in a

slot next to a SIM954 .

Precision SIM modules like the SIM910 and SIM911 Preampliﬁers,

SIM954 300 MHz Dual Inverting Driver Ampliﬁer

1.3 Operation Using an External Power Supply 1–3

the SIM918 Precision Current Ampliﬁer, the SIM921 AC Resistance

Bridge, the SIM922 and SIM923 Temperature Monitor modules and

the SIM970 Quad Voltmeter might show increased temperature drift

when operated close to a SIM954 ampliﬁer and would likely beneﬁt

from being thermally isolated from a SIM954.

As with any other power ampliﬁer, loads should be connected and discon-

nected with the ampliﬁer powered down to ensure safe operating conditions

for the SIM954 and the load.

Loads should be checked for their ability to handle the voltage, cur-

rent and power output limits of the SIM954 .

Many BNC style 50 Ωloads, terminators and attenuators, power split-

ters, mixers, etc., are at risk of being damaged by a SIM954 if no further

precautions against overload are taken.

1.3 Operation Using an External Power Supply

Unlike other SIM modules, the SIM954 has additional power supply

ﬁltering and protection against inverse polarity conditions and is

therefor somewhat more forgiving when used with custom power

supplies. A well regulated, low noise, bipolar power source with

±15 V, ±1 A output current can be used to power a SIM954 module.

As with any product that relies on external power, the user is responsible to

ensure that the supply never exceeds the maximum operating voltage, that

short circuit currents are limited, and that thermal overload is avoided.

Any SIM954 used outside of a mainframe should be kept in a well

controlled thermal environment where none of the ventilation slots

are covered and the sides are at least one inch away from any other

surface.

In this manual it is assumed that the SIM954 is used inside a SIM900

Mainframe. The speciﬁcations of the module always refer to use

inside a SIM900 mainframe.

1.4 Interfaces

There are a total of four BNCs on the SIM954 front panel. The upper

two are the input and output of Channel 1, and the lower two are the

input and output of Channel 2. The front panel calls out the input

impedance of 50 Ω, the output impedance of 3.3 Ωand the nominal

gain of −4 (12 dB) into a 50 Ωterminated load.

Each channel has an overload indicator, and there is a single ”On”

LED on the front panel to indicate that operating voltage is applied

to the module. This is useful when the module is used outside of the

SIM954 300 MHz Dual Inverting Driver Ampliﬁer

1–4 Operation

SIM900 mainframe. The ”On” LED does not indicate, however, that

the power supply voltage is correct and the power source has suﬃ-

cient output current to power the module under all load conditions.

1.4.1 SIM Interface Connector

The DB–15 SIM interface connector carries all the power and commu-

nications lines to the instrument. The connector signals are speciﬁed

in Table 1.1.

There is no microcontroller inside the SIM954 and the module does

not communicate over its serial port. However, the status/service re-

quest line (-STATUS) serves as an indicator for an overload condition

which can be detected by the mainframe or the user. This signal will

be pulled to ground during an overload condition. The duration of

the pull-down state is approximately the same as the on-time of the

front–panel overload LED (approximately 0.5s).

All other RS-232 signals are unused.

Direction

Pin Signal Src ⇒Dest Description

1 SIGNAL GND MF ⇒SIM Ground reference for signal

2−STATUS SIM ⇒MF Status/service request (GND =asserted, +5 V=idle)

(Overload condition indicator)

3 RTS MF ⇒SIM HW Handshake (+5 V=talk; GND =stop)(No con-

nection in SIM954)

4 CTS SIM ⇒MF HW Handshake (+5 V=talk; GND =stop)(No con-

nection in SIM954)

5−REF 10MHZ MF ⇒SIM 10 MHz reference (No connection in SIM954)

6−5 V MF ⇒SIM Power supply (No connection in SIM954)

7−15 V MF ⇒SIM Power supply

8 PS RTN MF ⇒SIM Power supply return

9 CHASSIS GND Chassis ground

10 TXD MF ⇒SIM Async data (start bit =“0”= +5 V; “1” =GND) (No

connection in SIM954)

11 RXD SIM ⇒MF Async data (start bit =“0”= +5 V; “1” =GND) (No

connection in SIM954)

12 +REF 10MHz MF ⇒SIM 10 MHz reference (No connection in SIM954)

13 +5 V MF ⇒SIM Power supply (No connection in SIM954)

14 +15 V MF ⇒SIM Power supply

15 +24 V MF ⇒SIM Power supply (No connection in SIM954))

Table 1.1: SIM Interface Connector Pin Assignments, DB-15

SIM954 300 MHz Dual Inverting Driver Ampliﬁer

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