SpinCore Technologies PA100W Bedienungsanleitung

PA100W

RF Power Amplifier

Owner’s Manual

SpinCore Technologies, nc.

http://www.spincore.com

PA100W RF Power Amplifier

Congratulations and thank you for choosing a design from

SpinCore Technologies, nc.

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At SpinCore we try to fully support the needs of our customers. f you

are in need of assistance, please contact us and we will strive to provide

the necessary support.

SpinCore Technologies, Inc. reserves the right to make changes to the product(s or information herein without notice. RadioProcessor™,

PulseBlaster™, SpinCore, and the SpinCore Technologies, Inc. logos are trademarks of SpinCore Technologies, Inc. All other trademarks

are the property of their respective owners.

SpinCore Technologies, Inc. makes every effort to verify the correct operation of the equipment. This equipment version is not intended

for use in a system in which the failure of a SpinCore device will threaten the safety of equipment or person(s .

http://www.spincore.com 2 2012-09-21

PA100W RF Power Amplifier

Table of Contents

. Precautions ................................................................................................... 4

Connecting & Disconnecting Power Amplifiers..............................................4

Power Considerations.....................................................................................4

. PA100W – 100 W Power Amplifier Module ............................................... 5

1. Overview ...................................................................................................................... 5

2. Specifications .............................................................................................................. 5

DC Electrical Specifications.......................................................................................5

RF Specifications.......................................................................................................6

3. PA100W RF Module with De-blanking Circuitry ...................................................... 6

RF Inp t and O tp t Connectors...............................................................................7

TTL Control Inp t Connector ...................................................................................8

DC Power Inp t Connector ....................................................................................10

4. PA100W RF Module Enclosure Options ................................................................. 10

1) PA100W mod le enclosed in a single bay enclos re with an integrated +24 V

power s pply – Fig re 7...........................................................................................11

2) PA100W mod le enclosed in a d al bay enclos re with an integrated +24 V

power s pply – Fig re 8...........................................................................................11

3) PA100W mod le f lly enclosed in a rack-mo nt enclos re................................13

5. Typical Set-Up For NMR Experiments .................................................................... 14

. Related Products and Accessories ........................................................ 15

V. Contact nformation ................................................................................. 15

V. Document nformation .............................................................................. 15

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PA100W RF Power Amplifier

. Precautions

Working with RF power amplifiers can be dangerous and even fatal if not handled properly.

Output voltages can reach values greater than 200 V peak-to-peak and can be fatal. Follow these

steps to avoid damaging the amplifier or inflicting serious injuries.

Connecting & Disconnecting Power Amplifiers

When connecting the power amplifier, follow these steps to avoid damaging the amplifier or

inflicting serious injuries.

1. Apply the load to the amplifier (make sure a load is ALWAYS present when working with

power amplifiers .

2. Apply the DC power to the amplifier.

3. Apply the RF input to the amplifier.

Repeat the steps in reverse order when disconnecting the amplifier.

Power Considerations

Make sure the following considerations have been made before applying power to the amplifier.

1. Be sure your load can appropriately dissipate the maximum power being applied by the

amplifier.

2. When applying an RF signal, work with low duty cycles to limit the power being dissipated.

The duty cycle ratio should be below 1% for safe operation.

http://www.spincore.com 4 2012-09-21

PA100W RF Power Amplifier

. PA100W – 100 W Power Amplifier Module

1. Overview

The PA100W RF power amplifier comes in a very compact broadband module delivering

100 Watts RMS (200 Watts PEP, Peak Envelope Power into a 50-ohm load. It has a frequency

range of 10 MHz to 100 MHz and is powered by a DC +24 to +28 V power supply (with the negative

terminal grounded . The PA100W has standard female SMA jacks for RF input and output, and a

screw terminal block for the DC power input. The PA100W typically operates in Class AB. The rise

and fall time of the RF pulse output is approximately 200 ns.

The product comes with blanking circuitry – the blanking circuitry keeps the PA100W blanked

(turned off until a TTL input (logical high is applied. The blanking circuitry helps to conserve

power, keeps the amplifier cool under typical operating conditions, and provides noise reduction

during the reception of NMR signals. To enable (deblank the power amplifier, a TTL pulse (logical

high needs to be applied to the control circuitry.

The PA100W power amplifier module measures 3.15" x 2.54" x 2.33" (80 x 65 x 59 mm . It can

be delivered as a module (with the blanking circuitry or in various enclosures - see the

“Configuration Options” section later in this document for more information.

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PA100W RF Power Amplifier

2. Specifications

DC Electrical Specifications

Table 1: Electrical specifications for the PA100W RF power amplifier.

Parameter Specification Units

Max DC Input Voltage 28 V (DC

Max RF input power 2.3 W

Max. continuous RF output power* 100 W (RMS

TTL De-blanking Voltage 3.3 V

*NOTE: Operating at this power level requires an adequate heat dissipation and an

appropriate rated power supply.

RF Specifications

Table 2: Input power necessary to achieve 100 Watts output power at a given frequency when the power amplifier is

supplied by a 28 V DC source.

Frequency nput Power (Watts RMS)

10 MHz 0.64

20 MHz 0.86

30 MHz 1.02

40 MHz 1.08

50 MHz 1.02

60 MHz 1.02

70 MHz 0.98

80 MHz 1.12

90 MHz 0.90

100 MHz 1.56

Table 2 shows data for the PA100W when supplied by +28 V. The PA100W is capable of

outputs greater than 100 W - however, it is important not to exceed the input power parameters for

the specific operating frequency (Table 2 to avoid damaging the module. Also note that if the

power amplifier is supplied by a +24 V DC source the gain is reduced and a maximum value of

approximately 150 W PEP can be achieved.

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PA100W RF Power Amplifier

3. PA100W RF Module with De-blanking Circuitry

This configuration does not have any enclosure for the PA100W RF module. It includes the de-

blanking circuitry mounted on top of the power amplifier to enable it when a TTL pulse is applied to

the control input pin. The module with no enclosure is shown below in Figure 1.

Figure 1: PA100W RF power amplifier module no

enclosure.

RF Input and utput Connectors

When connecting the PA100W RF power amplifier module, the RF signal source should be

connected to the SMA jack on the left hand side (top view of the circuit (RF in . The SMA jack on

the right hand side (top view is the RF output from the power amplifier (RF out . See Figure 2, on

the next page, for details.

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PA100W RF Power Amplifier

Figure 2: Top view of the PA100W power amplifier module depicting

connectors. RF in and RF out are SMA jack connectors, Input TTL is an

IDC connector and the input DC power connector is a screw terminal

block.

TTL Control Input Connector

The PA100W power amplifier module has a 10-pin shrouded male IDC connector, pin diagram

shown in Figure 3, which supplies the input TTL control signal. The control signal is pin 8 on the IDC

header and the corresponding ground is pin 7. The input is terminated by a 100-ohm load and

requires an external source capable of outputting at least 10 mA. The TTL requirements for the

deblanking control input are standard low voltage TTL values of 3.3V for a logical high, 0V for

logical low. A logical high signal is required to deblank (enable the PA100W. In testing, the TTL

deblanking pulse is typically applied 300 us prior to the application of the RF pulse. The end of the

deblanking signal coincides with the end of the RF pulse. See Figure 3 below for details.

Figure 3: 10-pin IDC connector (Digi-Key part A33159-

ND). Mates with Digi-Key part HKC10H-ND or similar.

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PA100W RF Power Amplifier

The timing diagram of a typical application of PA100W with the deblanking pulse applied prior to

the RF pulse is presented in Figure 4, below. The top trace is the deblanking signal, the trace

below represents the input signal, and the bottom trace is the RF output. In the lower panel, an

expanded view of the RF output pulse is depicted. At lower operating frequencies the output will be

progressively less sinusoidal. At these frequencies a filter will have to be used to obtain a sinusoidal

output. When working with short RF pulses, on the order of 1 us or so, triggering the oscilloscope

on the falling edge of the deblanking pulse will help with identifying and capturing the RF pulse on

the scope.

Figure 4: Representation of the deblanking and RF input and output signals to the PA100W.

http://www.spincore.com 9 2012-09-21

Deblanking

Signal

RF Output

Deblanking Delay Pulse Time

RF Input

PA100W RF Power Amplifier

DC Power Input Connector

The PA100W RF power amplifier module has a 5-pin screw-terminal input power connector. The

pin arrangements for this connector are shown below in Figure 5 (top view .

Figure 5: Top view of the 5-position power input

connector (Molex part 38720-6305).

4. PA100W RF Module Enclosure Options

The PA100W RF power amplifier can be delivered in various enclosures which protect the RF

power amplifier module and include an AC/DC power supply and internal RF cables. Configurations

“1” and “2” below have power inputs of 90V-264V AC. All enclosures have the RF input/output

signals provided on external BNC connectors. The TTL inputs are routed through female DB-9 input

connectors., see Figure 6 below for the pinout. The active TTL signal needs to be connected to pin

4, with the corresponding ground line connected to pin 8. Available enclosure configurations are

listed on the next page.

http://www.spincore.com 10 2012-09-21

Figure 6: DB-9 Female Connector Pinout

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