About: IQ imbalance

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IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage. Direct conversion receivers contain a local oscillator (LO) which generates both a sine wave at and a copy delayed by 90°. These are individually mixed with the RF signal, producing what are known respectively as the in-phase and quadrature signals, labelled and .

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  • IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage. Direct conversion receivers contain a local oscillator (LO) which generates both a sine wave at and a copy delayed by 90°. These are individually mixed with the RF signal, producing what are known respectively as the in-phase and quadrature signals, labelled and . However, in the analog domain, the phase difference is never exactly 90°. Neither is the gain perfectly matched between the parallel sections of circuitry dealing with the two signal paths. IQ imbalance results from these two imperfections, and is one of the two major drawbacks of direct-conversion receivers compared to traditional superheterodyne receivers. (The other is DC offset.) Their design must include measures to control IQ imbalance, so as to limit errors in the demodulated signal. (en)
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  • IQ imbalance is a performance-limiting issue in the design of a class of radio receivers known as direct conversion receivers. These translate the received radio frequency (RF, or pass-band) signal directly from the carrier frequency to baseband using a single mixing stage. Direct conversion receivers contain a local oscillator (LO) which generates both a sine wave at and a copy delayed by 90°. These are individually mixed with the RF signal, producing what are known respectively as the in-phase and quadrature signals, labelled and . (en)
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  • IQ imbalance (en)
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