Tuning a second order intercept point of a mixer in a receiver

An IP tuning circuit ( and ) for tuning the IP of a mixer ( and ) to minimize second order intermodulation distortion (IMD) in a receiver ( and ) of a transceiver ( and ). An operating characteristic of the mixer related to IMD is changeable by changing a value of a setting of the mixer. Two tones o...

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Bibliographic Details
Main Authors Sobchak, Charles LeRoy, Rahman, Mahibur, Shah, Manish N
Format Patent
LanguageEnglish
Published 07.08.2012
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Summary:An IP tuning circuit ( and ) for tuning the IP of a mixer ( and ) to minimize second order intermodulation distortion (IMD) in a receiver ( and ) of a transceiver ( and ). An operating characteristic of the mixer related to IMD is changeable by changing a value of a setting of the mixer. Two tones outside a bandpass of the receiver are injected into the mixer and a calibration tone within the bandpass is produced as a result of IMD. Alternatively, a DSSS signal is injected into the mixer and the calibration tone is produced at a chip rate of the DSSS signal. The power of the calibration tone is measured at a plurality of values of the settings. Alternatively, a four-level PN DSSS signal of known content is injected into the mixer, and a two-level PN DSSS signal of known content produced therefrom is correlated with a two-level PN DSSS signal of known content produced by a squaring circuit.