MMIC/Microlithic Surface Mounts
Our surface mount MMIC mixers package our optimized chips into industry standard ceramic QFN packages. These affordable packages offer good electrical performance to 30 GHz while also providing proven high reliability. Surface mount Microlithic® mixers are based on chip designs, but use integrated surface mount transitions that operate up to 32 GHz. Eval modules of both MMIC and Microlithic® surface mount mixers are available.
These mixers offer the best tradeoff between performance, size, repeatability, cost, and lead time/availability, particularly for higher volume applications. Marki develops MMIC and Microlithic® mixers using full electromagnetic and circuit based non-linear optimization. Our MMIC mixers are fabricated with precise tolerance on a GaAs substrate with high speed Schottky diodes. Marki MMIC mixers offer superior non-li+A1:C7ear performance and isolations compared to both competing MMIC mixers and hybrid mixers. Microlithic® mixers offer low, repeatable conversion loss performance. MMIC/Microlithic® chip/module mixers are designed as a small form factor chip. This chip is also packaged into a module that is suitable for high performance laboratory use or as an eval module with equivalent performance as the chip.
The T3 mixer is the most advanced mixer circuit available in the world. In addition to broadband overlapping LO, RF, and IF bands, it has the potential for extremely high linearity. T3 mixers are built using both hybrid constructions that create ultra-broadband coverage on all three ports (RF,LO, and IF) and in MMIC form as the MT3, which offers the scalability of a MMIC with the linear performance of the T3.
Since it is a true-commutating mixer, it will provide increasing two-tone intermodulation suppression, input 1-dB compression, and spurious suppression (for most spurs) as the rise time of the LO signal is increased by either increasing sine wave LO drive or using a square wave LO. Much more detailed information about the T3 can be found in our T3 Tutorial.
An IQ mixer consists of two mixers where the RF (or LO) ports are connected with an inphase power divider and the LO (or RF) ports are connected with a quadrature hybrid. The two IF ports, I for the in-phase component and Q for the 90° out-of-phase component, are available to the user. This combination allows the in-phase and quadrature components of the output signal to be modulated independently with each IF port. If an IQ mixer is used to transmit data, the in phase and quadrature components can be selected at the receiver by using another IQ mixer.
Image Reject (IR) and Single Sideband (SSB) Mixers
If the IF ports of an IQ mixer are combined with another quadrature hybrid, the result is a three-port device alternately called an image reject mixer (when used as a downconverter) or single sideband mixer(when used as an upconverter). This structure will reject one sideband when used as a downconverter and will preferentially produce one sideband when used as an upconverter. Selection of either the lower sideband or the upper sideband depends on the orientation of the IF quadrature hybrid relative to the I and Q ports. For extensive analysis of IQ, IR, and SSB mixers see the mixer basics primer and our tech note series on this topic.
Marki’s legendary hybrid mixers offer low conversion loss, isolation, and low LO drive capability across incredible bandwidths. While they have been surpassed in nonlinearity performance by T3, MMIC, and Microlithic® designs in smaller form factor chip and surface mount packages, legacy mixer connectorized modules are still a sound choice for legacy systems and laboratory use.
M1 double balanced mixers have excellent isolations and conversion loss to 26 GHz. M2 triple balanced mixers offer ultrabroadband overlapping frequency coverage on all three ports. M4 diplexed IF mixers have very broadband RF/LO frequency coverage with low IF frequencies, excellent for test and measurement applications. M8 mixers offer high isolations and very low conversion loss using a specially balanced technique. M9 millimeter wave double balanced mixers offer high frequency RF/LO coverage to 65 GHz with high IF frequencies.