Abstract: The invention relates to a mixing circuit for mixing a first signal RF with a second signal LO including a conversion stage T3 to convert the first signal RF into a current, a mixing core T1 and T2 to mix said current with the second signal LO, said mixing core being loaded via at least one load element ZC. Said circuit includes noise optimization means taking into account the contribution of the load element or elements ZC to the noise inversely proportional to the frequency that is present in the output signal. In particular the load elements can be selected from inductive resistors or silicon resistors or be constituted by resistors of a size selected to optimize the noise inversely proportional to frequency. The invention allows the production of mixers with very good performance at low frequency via a simple micro-electronic process of resistor forming.

Abstract: The invention relates to a mixing circuit for mixing a first signal RF with a second signal LO including a conversion stage T3 to convert the first signal RF into a current, a mixing core T1 and T2 to mix said current with the second signal LO, said mixing core being loaded via at least one load element ZC. Said circuit includes noise optimization means taking into account the contribution of the load element or elements ZC to the noise inversely proportional to the frequency that is present in the output signal. In particular the load elements can be selected from inductive resistors or silicon resistors or be constituted by resistors of a size selected to optimize the noise inversely proportional to frequency.