Digital High-Linear Closed-Loop CMOS Transmitter with Highest Energy Efficiency for Future Mobile Radio Generations (DigiMOST)

适用于未来移动无线电世代的具有最高能效的数字高线性闭环 CMOS 发射机 (DigiMOST)

• 批准号: 504495555
• 负责人: Professor Dr.-Ing. Friedel Gerfers
• 金额: --
• 依托单位: Department Mikrowellentechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/504495555?language=en
• 关键词: Digital; Linear; Closed; Loop; CMOS

This application aims at the realization of a novel digital transmitter for energy-efficient handsets with high signal bandwidth, as required in future generations of mobile communications. The project proposes a purely digital transmitter concept that integrates the power amplifier into a feedback loop. The inevitable nonlinearities of the amplifier are thus corrected as they arise, eliminating the need for time-consuming characterization. The feedback loop enforces the linearity of the overall system from input to output. This also means that, contrary to previous transmitter solutions, no signal pre-distortion or DPD is required. The sometimes high computational effort for pre-distortion is eliminated. This opens up degrees of freedom for improving efficiency, which can be exploited with the aid of a flexible modulator. For the first time, this approach can simultaneously minimize linearity and energy efficiency for a digital transmitter. This will be demonstrated using a CMOS-based digital transmitter for handsets up to 6 GHz with 500 MHz signal bandwidth. The following two aspects in particular are new with this: 1. Inclusion of the digital RF power amplifier in the modulator feedback loop. This is not possible with analog amplifier concepts, but can be implemented in the intended project using purely digital technology with a digital power amplifier. It allows intrinsic linearization of even extremely nonlinear amplifiers or amplifiers without additional effort for constant parameter estimation or DPD.2. Thus, the amplifier can be designed for maximum energy efficiency, enabling new and power-saving circuit topologies. In addition, in contrast to all previous work, the combination of optimal modulator and closed-loop approach creates sufficient scope with regard to ACLR and EVM even for broadband signals of future mobile radio generations.In addition, the state of the art is extended in other respects as well:1. Investigation of the proposed modulation scheme for a digital PA for suitability for fixed-point arithmetic.2. Integration of all components of the transmit chain on a monolithic chip which, viewed as a black box, can replace analog transmit chains as drop-in replacement completely transparent with respect to the signal to be amplified.3. The use of a nanometer CMOS technology (e.g. 22nm FDX) with transit frequencies of 350-400GHz enables the realization of digital power amplifiers with 5/6G relevant carrier frequencies and signal bandwidths.

本申请旨在实现一种新的数字发射机，用于具有高信号带宽的节能手机，如未来几代移动的通信所需。该项目提出了一个纯数字发射机的概念，集成到一个反馈回路的功率放大器。因此，放大器不可避免的非线性会在出现时得到校正，从而消除了耗时的表征。反馈回路加强了整个系统从输入到输出的线性。这也意味着，与以前的发射机解决方案相反，不需要信号预失真或DPD。消除了有时用于预失真的高计算工作量。这为提高效率提供了自由度，可以借助灵活的调制器加以利用。这种方法第一次可以同时最大限度地降低数字发射机的线性度和能效。这将证明使用CMOS为基础的数字发射机的手机高达6 GHz的500 MHz的信号带宽。以下两个方面尤其是新与此：1. 在调制器反馈环路中包括数字RF功率放大器。这在模拟放大器概念中是不可能实现的，但可以在预期的项目中使用纯数字技术和数字功率放大器来实现。它允许甚至极端非线性放大器或放大器的固有线性化，而无需进行恒定参数估计或DPD。 因此，放大器可以设计为最大能效，从而实现新的节能电路拓扑结构。此外，与所有以前的工作相比，最佳调制器和闭环方法的组合甚至对于未来移动的无线电代的宽带信号也创建了关于ACLR和EVM的足够范围。 研究所提出的数字功放调制方案对定点算法的适用性. 将传输链的所有组件集成在单片芯片上，该芯片被视为黑盒，可以取代模拟传输链，作为相对于要加密的信号完全透明的插入式替代品。3. 使用具有350- 400 GHz的传输频率的纳米CMOS技术（例如，22 nm FDX）使得能够实现具有5/6 G相关载波频率和信号带宽的数字功率放大器。