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In this paper three different monolithic disvibuted mixers have been characterized in detail in order to identify the dominant operating modes and mixing mechanisms. The first chip is a cascode mixer. using two FETs to mimic the dual-gate FET mixer. The second chip is a novel matrix mixer. which draws on the matrix distributed amplifier concept. The third circuit is a balanced mixer using common-source and common-gate FET pairs. All three circuits operate over 1 to 14 GHz.

In this paper. the accurate characterization of an ultra-wideband monolithic CPW-to-Slotline transition is described. An accurate model for this transition is presented which gives excellent agreement with the measured data by incorporating dispersion in both the CPW and slotline. junction pamsitics. and frequency dependence of the transformer turns ratio from the classical transition model.