Patent ID: 7457606
Filing Date: 2008-11-25
Classification: H03C,H03D

Abstract:
1. A mixer comprising: a first switch configured to be controlled by a first local oscillator signal and a second switch configured to be controlled by a second local oscillator signal, the second local oscillator signal having a phase difference of about 90° with respect to the first local oscillator signal; a third switch configured to be controlled by a third local oscillator signal and a fourth switch configured to be controlled by a fourth local oscillator signal, the fourth local oscillator signal having a phase difference of about 90° with respect to the third local oscillator signal, wherein the third local oscillator signal has a phase difference of about 180° with respect to the second local oscillator signal and the fourth local oscillator signal has a phase difference of about 180° with respect to the first local oscillator signal, and a transconducting stage, electrically coupled to the first, second, third, and fourth switches and configured to receive an input signal, wherein the input signal is multiplied respectively by the local oscillator signals to generate first, second, third, and fourth multiplied signals, and the first and third multiplied signals are provided respectively from outputs of the first and third switches to a first mixer output terminal of the mixer and the second and fourth multiplied signals are provided respectively from outputs of the second and fourth switches to a second mixer output terminal of the mixer.