Patent ID: 8023923
Filing Date: 2011-09-20
Classification: H03D

Abstract:
1. Apparatus comprising: a down-conversion mixing component arranged for down-converting an input radio frequency signal; and an active load circuit connected to output terminals of said down-conversion mixing component, wherein said active load circuit includes an active load and modulator arranged for modulating a flicker noise produced by said active load away from a signal band of a signal output by said down-conversion mixing component, wherein said active mixer load includes a first transistor, a second transistor and an operational amplifier, wherein a first output terminal of said down-conversion mixing component is connected to a first input of said operational amplifier, wherein a second output terminal of said down-conversion mixing component is connected to a second input of said operational amplifier, wherein a reference common mode voltage is applied to a reference common mode voltage input of said operational amplifier, wherein an output of said operational amplifier is connected in parallel to a respective gate of said first transistor and said second transistor, and wherein said switching elements are arranged for connecting alternately on the one hand said first output terminal of said down-conversion mixing component via said first transistor and said second output terminal of said down-conversion mixing component via said second transistor to ground, and on the other hand said first output terminal of said down-conversion mixing component via said second transistor and said second output terminal of said down-conversion mixing component via said first transistor to ground.