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Improving Receiver Intercept Point Using Selectivity

• Tags:
• radio,
• points,
• point,
• receiver

Overview The 2nd- and 3rd-order intercept points of a receiver represent the two most important linearity specifications of a certain radio circuit or system. They allow us to predict the receiver's intermodulation (IM) performance, which describes the radio's susceptibility to interference for adjacent or nearby users. In this article, a modification of the traditional receiver intercept point (IP) cascading equation is presented for both the 2nd- and 3rd-order IM cases. The mathematical derivation for each of the 2nd-order (IP2) and 3rd-order (IP3) intercept point cascading equations incorporates the effect of adding selectivity (S) between receiver stages in order to improve the overall 2nd- and 3rd-order input intercept points IIP2 and IIP3, respectively.

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