Recent products for sale ( Some products are being re-stocked. Sorry for the inconvenience. Most will be available in 72 hours)

SPG is releasing several new products for sale. Please browse through the listings below

All products except software and reports carry a money back guarantee. If not satisfied please return within 30 days for a full refund.

Products ( Click on the image to review/purchase the product) ( You can also purchase a product using a check or a money order!) For any questions or support please email:


A simple RF amplifier. Bandwidth from 40 Mhz to 2.5 Ghz+. Power supply, 3.0V to 5.0V, SMA input/output connectors, 50 Ohm input and output impedance.

Item is a low noise amplifier ( LNA). The frequency of operation is from 40 Mhz to 2.5Ghz+. The power gain with 50 Ohm, input and output impedances varies between 17dB to 20dB. The noise figure is typically 1 dB over the frequency range. OIP3 is between 30 dB and 33 dB. P1dB is typically between 17dB and 20 dB. The operating power supply is between 3.0V and 5.0V. The input return loss is between 8 to 18 dB typically. The output return loss is between 12dB and 17dB.  The reverse isolation is typically 22 dB. The operating current varies between 28mA and 54mA depending on biasing. The maximum input RF power should not exceed 25 dBm. The absolute maximum operating supply is 5.5V. The operating supply voltage range is -40 to 85 Degrees Centigrade.Please click on the image to buy the amplifier.


A 2 stage wideband RF amplifier
Item is a wideband, 35 dB gain, RF amplifier. The power supply can be from 3.0V to 5.0V. The gain varies from 38dB at lower frequencies to 20 dB at approximately 2.5 Ghz. I/O impedance is 50 Ohm. Operating temperature is from -40 to 85 Deg C.
A practical handbook of impedance matching focusing on simple and popular methods of impedance matching and freely available CAD tools. A large number of javascript calculators are also included.
Image of a funny looking calculator
A set of calculators useful in impedance matching and other EM type problems. Allow quick calculations for some common quantities.
Frequency divider image
A frequency divider with differential inputs and a single ended output capable of driving 18mA. The input frequency should indeally be at or above 500 Mhz to 5 Ghz+. The supply voltage is typically 3.3V. The divider ratios can be set at 8, 16,32, and 64. Typically the divider ratio and the input frequency is set so as to produce 200 Mhz at the output. Please click on the image to purchase.
A single ended frequency source ( signal generator) whose frequency can be specified by the customer between 750 Khz to 1.35 Ghz. Please read the datasheet of the product at Please click on the picture for further details on price and delivery.

A differential output frequency source ( signal generator). Frequency 1.0 Ghz. Please click on the picture for price and delivery details.

Reports icon
The Wilkinson divider is an extremely useful circuit that is used to split or combine signals using a microstrip or stripline design. This report is a detailed study of a two - way split Wilkinson divider available from Signal Processing Group Inc. Please contact us at for further details, price and availability. The contents of the report are listed here.
  1. Introduction.
  2. Fundamentals.
  3. Choice of substrate.
  4. Size
  5. Higher order modes.
  6. Surface waves.
  7. Conductor loss.
  8. Dielectric loss.
  9. Radiation loss.
  10. Power handling.
  11. Dielectric strength.
  12. Thermal conductivity.
  13. Javascript Calculators.
An ISM band, 902 - 928 Mhz, medium power, 12.0V, VCO and FM modulator

This product is an ISM band, 902Mhz to 928 Mhz, medium power, 12.0V VCO and FM modulator. Please click on the image for price, availability and specifications.

This product is a wideband RF power detector that operates from 50 Mhz to 2.5 Ghz+. The power supply can vary from 3.0V to 5.25V. The dynamic range of the input is 75 dB and the maximum allowable input signal is 15 dBm. The supply current is 36 mA at 5.0V. There is an enable input. For more details please click on the image.
C++ script for the RAPP model.
This is a C++ script that implements the RAPP RF power amplifier model for behavioral simulation of power amplifier effects. Please contact us on for details of how to access this script for use with a C++ or a C program.


A simple RF amplifier for purchase The book is "VSWR and impedance matching techniques" An image of a funny looking calculator