Patent ID: 7831234
Filing Date: 2010-11-09
Classification: H03D

Abstract:
1. A mixer arrangement comprising: a mixer input configured to receive a radiofrequency signal; a mixer cell comprising a signal input coupled to the mixer input, a local oscillator signal input, and a signal output, wherein the mixer cell is configured to frequency convert a signal present at the signal input to an intermediate frequency; a first current source coupled to the signal input of the mixer cell; a second current source coupled to the signal output of the mixer cell; wherein at least one current source of the first and second current source is configured as a regulatable current source comprising a control input; and a first sensor circuit configured to detect and output a value derived from a current level of the at least one current source; a second sensor circuit coupled to the signal output of the mixer cell and configured to detect a common-mode level present thereat; a desired value regulating circuit comprising a feedback input coupled to the first sensor circuit, and a regulating output coupled to the control input of the at least one current source, wherein the desired value circuit is configured to output a regulating signal to the regulating output that is derived from a comparison of a signal present at the feedback input with a desired value based on the common-mode level detected at the signal output by the second sensor circuit, thereby regulating the at least one current source.