Abstract: A method, of reducing distortion due to a third order intermodulation (IM3) product, may include: receiving an original signal; and performing, before frequency translation is done to the original signal or a version thereof, steps that include the following, firstly manipulating the original signal to form a first manipulated signal that includes a first IM3 product, secondly manipulating the original signal to form a second manipulated signal that includes a second IM3 product, and combining (A) one of the first manipulated signal or a version thereof having substantially the same frequency with (B) one of the second manipulated signal or a version thereof having substantially the same frequency such that the second IM3 product is used to substantially counteract the first IM3 product.

Abstract: A calibration circuit and method thereof. In the example method, a common-mode voltage may be detected at an output port of a mixer. At least one common-mode feedback voltage may be generated (e.g., at one or more common-mode feedback circuits) based on the detected common-mode voltage. A loop gain may be adjusted in response to a gate control signal (e.g., received at a controller, such as a second order Intecept Point (IP2) controller). An impedance may be adjusted at the output port of the mixer and a current applied to the output port of the mixer may be adjusted based on the at least one common-mode feedback voltage. The example method may be performed by a calibration circuit (e.g., an IP2 calibration circuit).

Abstract: A circuit for calibrating a second order intercept point (IP2) and for reducing second order intermodulation (IM2) includes a common mode feedback circuit and a load impedance operatively connected between first and second output terminals of a mixer in a direct conversion receiver. The common mode feedback circuit reduces second order intermodulation of the mixer by detecting an output voltage of the mixer and adjusting a gain of the mixer. The IP2 is controlled by controlling the gain of the common mode feedback circuit. The second order intermodulation (IM2) may be reduced and the linearity of a device may be enhanced.