Marki will expand the waveguide offerings based on its developing portfolio strategy. For specific product requests, please contact [email protected].
Marki can currently support all the current production parts that Precision has designed and built to date.
While our current portfolio will support up to 220GHz, new products will be able support into the sub-THz frequency range.
Please go to https://www.markimicrowave.com/company/rfq/ to complete a custom product enquiry and our support team will be in contact with you.
No, Marki has purchased the Waveguide business of Precision. This includes www.precisionmmw.com which will host all of the product portfolio options until such time that they can be integrated onto www.markimicrowave.com
The T3 mixer line is the premier mixer topology for the suppression of intermodulation products on the market today. T3 literally stands for “Two-Tone Terminator” and is especially effective when combined with a square-wave driving LO amplifier. Such amplifier-mixer combinations can be purchased under the T3A mixer line.
The answer is no we don't for the frequency and/or power they are asking for. These are residual phase noise measurements, so we had a lot of trouble finding a condition where we were able to get clean data that wasn't pushed into the noise floor of the measurement. The reason we used 6V on these measurements was because we had to use batteries to power the DC power supply to clean up the measurement enough, and so we ultimately had to chain 4 1.5V batteries together.
One of the goals that we have in the near term future is to populate our data with more information about phase noise performance vs. input power. Subsequently, we would like to be able to have some experimentation about the phase noise vs. frequency, but this is much harder to do comprehensively because of limitations of the phase noise system we have currently, and the amount of frequency-specific filtering and isolation that is needed to make clean reliable measurements at each specific frequency point.
Based on what we have seen, the phase noise performance is not linked very strongly with frequency. I would not expect the phase noise to be much better or worse at 2.5 GHz than it is at 4 GHz or 8 GHz. Where I expect it will begin changing is if you are moving to a high enough frequency that you are getting higher levels of compression at some similar input power. To first order, Enrico Rubiola shows experimentally that phase noise performance is somewhat independent of frequency on page 12 of Phase Noise in RF and Microwave Amplifiers.
The question about variation with input power is a tough one, primarily because of the difficulty in measuring reliable clean residual phase noise data for very clean low phase noise amplifiers. The question of the relationship between HBT amplifier compression and phase noise performance is one we really want to answer. Our understanding based on the literature and data we have seen is that in HEMT and FET amplifiers, there is a significant degradation in phase noise performance as the amplifier enters high compression (likely due to AM-PM conversion). We would expect a similar relationship in HBTs, but we didn't see that trend clearly when we were running our own experiments. We also found some evidence in the literature from the second paper attached that the trend isn't quite as strong in HBT amplifiers as they are in FET amplifiers. (See the final page of Jason Breitbarth's paper Additive Phase Noise in Linear and High-Efficiency X-Band Power Amplifiers).
A detailed answer to this question can be very involved, see the Mixer Basics Primer or the Mixer Basics Video for a detailed explanation. The short, intuitive explanation resides in the fact that the intermixing of tones takes place when the diodes are conducting, or at least partially conducting. Thus, there must be enough voltage drive to turn the diodes on to allow for the nonlinear intermixing of multiple tones. When the diode barrier is increased, the mixer will require a higher applied voltage to allow for nonlinear intermixing—hence intermodulation distortion products will be better suppressed.
I-port configuration refers to whether the I and Q ports are on the top or the bottom of the package/device, and it is only relevant for surface mount or chip components (not connectorized modules, which you can just flip upside down). It allows the designer another degree of freedom in circuit layout. Most surface mount and chip components are available in our standard -2 configuration, but a -1 version could be made with a minimum buy quantity. Contact support at markimicrowave.com for more information.
Generally, double balanced mixers have the best isolation performance due to their highly symmetrical 4 diode configuration. Marki Microwave MM1 mixers are best suited for high isolation applications, due to their computer-optimized passive structures.