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本文提出一种功耗仅20mW的GSM/WCDMA宽带接收机，通过RF信道选择技术解决了传统N-path滤波器在窄带应用中选择性不足、LNA需承受强阻塞以及功耗过高（约60mW）的问题。
Recent work on RF receivers has exploited N-path filters to address two critical issues, namely, blocker tolerance and high RF selectivity [1,2]. However, these designs face three drawbacks: (1) the low-noise amplifier (LNA) incorporates a Gm stage that, even with a virtual ground at its output nodes, must still withstand strong blockers at its input; (2) the low-order filter transfer function does not provide sufficient selectivity in narrow-band applications such as GSM or WCDMA; (3) they consume roughly 60mW around 2GHz. This paper introduces a wideband receiver that realizes filtering at the LNA input (rather than output) so as to achieve selectivity even for GSM channels. The receiver can tolerate a 0dBm blocker at 23MHz offset and its RF channel selection devices can be readily configured to operate with WCDMA or IEEE802.11b/g as well. In order to describe the receiver’s operation, we begin with the simplified view
Joung Won Park, Behzad Razavi
University of California, Los Angeles, CA