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线性接收IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 14, NO. 7, JULY 2004

325

Linearization of Receivers Using Envelope Signal Injection
Walter H. Y. Chan and Georg Bck, Senior Member, IEEE

Abstract―This paper presents a new linearization method for receivers employing envelope signal injection. In this technique, the third-order intermodulation distortion (IM3), at the output of a mixer in IF band, is cancelled by injecting the envelope of the RF input signal to both the low noise amplifier (LNA) and the mixer. By properly adjusting the amplitude and polarity of the injected envelope signal, up to 40-dB improvement of the IM3 and 11-dB improvement of the IM5 is obtained in a two tone test with 100-kHz separation at 1.9 GHz. This method operates very well over a wide range of power up t……
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