Equalizers on Demand, by R. A. Wood Associates

"Equalizers on Demand" are wideband, low loss frequency Equalizers made to provide a positive or negative gain slope from the lower frequency to the upper frequency. These Equalizers are designed to flatten out slope caused by long cables or other passive losses, or amplifier positive or negative gain slopes. We have developed a wide series of Equalizers with various slopes covering different frequency bands from DC to 20 GHz. Please see the current parts catalog table below.

Equalizers are very important to help your system obtain the best dynamic range performance. You can use them to flatten out a negative gain slope to reduce gain tolerances/differences before going into high dynamic range amplifiers.

We aim to create a new paradigm in RF performance with this series of products. We can provide these very quickly to help correct slope in an RF path. "Equalizers on Demand" can trim RF path slopes almost as easily as attenuators can be used to adjust nominal gains.

Below is a list of parts we currenty have available. We are still adding to this list. If you don't see what you need, or would like us to quote an order, please contact us with the following information in a format of REQ-M05-Fxx.x-yy.y-Szz.z, where xx.x =Start frequency, yy.y. = Stop frequency , and zz.z = Full band slope. This table is sorted first by Stop Frequency (ascending), then by Start Frequency (ascending), and then by Full Band Slope (ascending). For more detailed information on the catalog below, please review the Catalog Information section of this page. If you would like to see more information including examples of usage or repeatability, refer to the Additional Information section of this page.

The M05 Equalizer Package Outline Drawing is our standard package for all equalizers, and is the package we keep in stock for fast turn-around times. This package was designed to allow for direct connection to RF components such as amplifiers and couplers.

The M08 Equalizer Package Outline Drawing is our optional package for all equalizers. This package requires longer lead times.

The M01 Equalizer Package Outline Drawing is an optional package for equalizers up to 12 GHz. This package requires longer lead times.

The M02 Equalizer Package Outline Drawing is an optional package for equalizers up to 18 GHz. This package has now been replaced by the M05 package. This package requires longer lead times.

The equalizers normally ship with SMA male (J1) and SMA female (J2) connectors. If you want SMA male connectors on each end, add -MM to the part number. If you want SMA female connectors on each end, add -FF to the part number. Other helpful descriptors to include in the Equalizer part number are custom slopes and high linerarity, identified as "B" or "H," and "HL" in the parts catalog, respectively. You can find an example detailing the higher linearity Equalizer in the additional information section below.

R. A. Wood Associates reserves the right to make minor modifications to limits if needed to allow for producibility and manufacturing yields. In general, electrical performance improves as design improvements are learned and incoporated. If you would like to be notifed of limit changes, please contact us, and we will keep you informed.

Here is some additional information about our "Equalizers on Demand"

• An example of using an equalizer to "flatten out" an amplfier negative gain slope
• Amplifier Gain plot without equalization, showing ~5 dB neg slope)
• Amplifier Gain plot with 6 dB input equalization, designed to provide about 1 dB positive slope
• Another example of using an equalizer to "flatten out" our Extreme Bandwidth RF Amplfier negative gain slope from 5 kHz to 3 GHz
• Amplifier Gain plot without equalization, showing ~8 dB neg slope up to 3 GHz)
• Input equalizer showing ~8 dB positive slope up to 3 GHz)
• Resulting Amplifier Gain plot with 8 dB input equalization, designed to provide about 0 dB slope
• An example of the repeatability of the equalizer designs can be observed in the two separate units below. They are pretty close!
• Part No. REQ-M02-F1.0-8.0-S12.0, SN001, 1.0-8.0 GHz, 12 dB Slope
• Part No. REQ-M02-F1.0-8.0-S12.0, SN002, 1.0-8.0 GHz, 12 dB Slope
• There are some tradeoffs that can be made between linearity and insertion loss at the high end. If you need better linearity from the best fit line, you may have a little higher insertion loss at the high frequency.
• Part No. REQ-M02-F0.5-8.0-S15.5, is a 15.5 dB slope equalizer with 2.1 dB P-P linearity, and 1.5 dB max loss.
• Part No. REQ-M02-F0.5-8.0-S15.5-HL, is a 15.5 dB slope equalizer with 1.5 dB P-P linearity, and 2.0 dB max loss.