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PHA-202+Amplifier.php    8518 Bytes    20-05-2021 08:18:31

PHA-202+ Amplifier

+30 dBm (1 Watt), 2 – 2500 MHz, Gain 17 dB

PHA-202+ Amplifier

The assembled prototype. Pure Power !

✈ Motivation

RF-Amplifiers is the thing coming directly after Power Supplies. You never can have enough of them. Especially broadband High Power Amplifiers. Because this would allow you to use antennas with low efficiency. (We are not clumsy antenna builders, but often space restricts the design).

Specifications :

Frequency Range2 - 2500 MHz
Gain17 dB
Output Power+30 dBm (1 Watt) @ 1 dB Compression
DC supply voltage15 V, 350 mA

✈ The Design

PHA-202+ Recommended Application Circuit

Recommended Application Circuit courtesy of Mini Circuits

The Design is actually very classic. It follows the standard open-collector Gain-Block scheme found in many other amplifier designs. There is no Voltage regulator included, as it is designed for the usual +15 V supplies, beeing present almost everywhere in our labs. Instead of a big resistor for current-limiting, we use twelve 1 Ω resistors, 1206 to do the job. The wideband choke L1 is a 5.6 µH from Coilcraft, beeing able to withstand currents of up to 700 mA in the range of 30 – 3000 MHz. And the Heatsink is custom designed to fit our standard Case No 3. A small hole under the amplifier chip has been introduced to allow for hand-soldering of the device.

"The Hole" - a disaster for Reflow Soldering, but a genious strike when Hand Soldering.

The design uses Coplanar Waveguides. For our FR4, 1.5 mm thick, we use traces with 1.27 mm width and a gap of 0.23 mm. This works nice with the 0805 sized coupling capacitors.

✈ Downloads

✈ Performance

S21, measured with a Spectrum Analyser with Tracking Generator. Input Power was 0 dBm. Some ripple above 2 GHz indicates an impedance offset.

+30 dBm (1 W) is easily reached on all HF/VHF/UHF QO-Bands.

✈ Credits • Note of Thanks

We would like to thank the highly motivated staff of Coilcraft for their efforts to supply us (our research group at ETH zürich) with free samples.


PHA-202+ Amplifier

Problems with heat ??? No, thanks to Andi and Team from our brilliant workshop.

✈ Share your thoughts

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t1 = 6585 d

t2 = 200 ms

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