The front-end of a conventional millimeter-wave receiver (RX) consists of a bandpass filter (BPF) and low-noise amplifier (LNA) prior to the frequency down-conversion mixer. In interference-limited wireless channels, it is more footprint and power efficient to remove the BPF and LNA, and realize the mixer as a “passive” switching scheme. The noise figure of this passive mixer-first RX is improved when numerous such RXs are placed in a phased array or multi-input multi-output (MIMO) configuration. The passive switching mixer can be followed with an on-chip selective passive low-pass filter (LPF) with a small footprint given the large channel bandwidth that is typical in mm-wave applications. In this article, system and circuit design aspects of mm-wave passive mixer-first RXs are discussed and validated by a proof-of-concept 65-nm CMOS prototype. The implemented RX operates in the 21–29-GHz frequency range with 0.5-GHz instantaneous single-sideband (SSB) bandwidth, and achieves stopband to passband rejection of >49 dB, an in-band $\rm {ICP_{-1\,dB}}$ of −6 dBm, and out-of-band $\rm {B_{-1\,dB}} > 3.4$ dBm.

中文翻译：

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毫米波混频器优先接收器，具有选择性无源宽带低通滤波

常规毫米波接收器（RX）的前端由带通滤波器（BPF）和低噪声放大器（LNA）组成，然后进行频率下变频混频器。在受干扰限制的无线信道中，移除BPF和LNA并将混频器实现为“无源”切换方案，具有更大的占位面积和功率效率。当大量此类RX放置在相控阵或多输入多输出（MIMO）配置中时，此无源混频器优先RX的噪声系数将得到改善。给定无源开关混频器之后，可以使用片上选择性无源低通滤波器（LPF），因为毫米波应用中通常具有较大的通道带宽，所以该封装具有较小的占位面积。在本文中，通过概念验证的65 nm CMOS原型讨论并验证了毫米波无源混频器优先RX的系统和电路设计方面。 $ \ rm {ICP _ {-1 \，dB}} $ -6 dBm且带外 $ \ rm {B _ {-1 \，dB}}> 3.4 $ dBm的