13.3 A SAW-less reconfigurable multimode transmitter with a voltage-mode harmonic-reject mixer in 14nm FinFET CMOS

2017 IEEE International Solid-State Circuits Conference (ISSCC) Pub Date : 2017-02-01 DOI:10.1109/ISSCC.2017.7870340

V. Bhagavatula, D. Kwon, Jaehun Lee, Q. Bui, Jeong-Hyun Choi, Siuchuang-Ivan Lu, S. Son

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引用次数: 17

Abstract

Multimode cellular RFICs need high dynamic range in order to simultaneously satisfy the high linearity requirements of LTE and the low-noise performance of 2G. Traditionally, SAW filters are employed to relax the noise-linearity trade-off at the cost of higher BOM. In a highly competitive market, mobile devices need to support >35 LTE bands, a number which is expected to rise further in the future, providing a strong motivation for SAW-less transmitter (TX) design. An LTE TX operating in the single resource-block (RB) mode is susceptible to spurious out-of-band (OOB) emission due to the high power spectral density concentrated in narrow bandwidths at frequency offsets as large as 4.5MHz (LTE10) or 9MHz (LTE20) from the carrier [1]. The most challenging condition is for B13 where the 3rd-order counter intermodulation (CIM3) product falls in an adjacent public-safety band. With 23dBm at the antenna, a B13-TX must ensure OOB emission less than −57dBm/6.25kHz in the public safety band.

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13.3一种14nm FinFET CMOS的无saw可重构多模发射机，带有电压模谐波抑制混频器

为了同时满足LTE的高线性度要求和2G的低噪声性能，多模蜂窝rfic需要高动态范围。传统上，SAW滤波器被用来放松噪声线性权衡，代价是更高的BOM。在竞争激烈的市场中，移动设备需要支持bbb35 LTE频段，这一数字预计将在未来进一步上升，为无saw发射机(TX)设计提供了强大的动力。在单资源块(RB)模式下工作的LTE TX容易受到带外杂散(OOB)发射的影响，因为在频率偏移高达4.5MHz (LTE10)或9MHz (LTE20)的载波[1]处，高功率谱密度集中在狭窄的带宽中。最具挑战性的条件是B13，其中三阶计数器互调(CIM3)产品落在相邻的公共安全波段。当天线处为23dBm时，B13-TX必须保证在公共安全频段OOB发射小于- 57dBm/6.25kHz。

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2017 IEEE International Solid-State Circuits Conference (ISSCC)

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