公开(公告)号：US20160308547A1

公开(公告)日：2016-10-20

申请号：US15130636

申请日：2016-04-15

Applicant: MaxLinear, Inc.

Inventor： Gaurav Chandra ,  Tao Zeng ,  Shantha Murthy Prem Swaroop ,  Jianyu Zhu

IPC: H03M1/10 ,  H03M1/68

CPC classification number: H03M1/1023 ,  H03M1/0607 ,  H03M1/68

Abstract: Systems and methods are provided for digital-to-analog converter (DAC) with digital offsets. A digital offset may be applied to an input of a digital-to-analog converter (DAC), and digital-to-analog conversions are then applied via the DAC to the input with the digital offset. The digital offset is set to account for one or more conditions relating to inputs to the DAC, with the one or more conditions affect switching characteristics of one or more of a plurality of conversion elements in the DAC, and where each conversion element handles a particular bit in inputs to the DAC. The digital offset may be determined dynamically and adaptively, such as based on the input and/or conditions relating to the input. Alternatively, the digital offset may be pre-determined and fixed. One or more adjustments may be selectively applied to the digital offset for particular input conditions.

Abstract translation: 为具有数字偏移量的数模转换器（DAC）提供了系统和方法。 数字偏移可以应用于数模转换器（DAC）的输入端，然后通过DAC将数模转换应用于具有数字偏移量的输入。 数字偏移被设置为考虑与DAC的输入相关的一个或多个条件，其中一个或多个条件影响DAC中的多个转换元件中的一个或多个的开关特性，并且其中每个转换元件处理特定 位到DAC的输入。 数字偏移可以被动态地和自适应地确定，例如基于与输入有关的输入和/或条件。 或者，数字偏移可以是预定的和固定的。 一个或多个调整可以选择性地应用于特定输入条件的数字偏移。

公开(公告)号：US20150194932A1

公开(公告)日：2015-07-09

申请号：US14589801

申请日：2015-01-05

Applicant: Maxlinear, Inc.

Inventor： Ramesh Sridhar ,  Timothy Gallagher ,  Ali Shahed hagh Ghadam ,  Shantha Murthy Prem Swaroop

IPC: H03F1/02 ,  H04B1/04 ,  H03G3/30 ,  H03F3/19 ,  H03F3/21

CPC classification number: H04B1/0475 ,  H03F1/02 ,  H03F1/3241 ,  H03F1/3247 ,  H03F3/195 ,  H03F3/213 ,  H03F3/24 ,  H03F2200/451 ,  H03F2201/3215 ,  H03G3/3042 ,  H04B2001/0425 ,  H04B2001/045

Abstract: Methods and systems for crest factor reduction may comprise generating an original waveform, generating a distortion signal by reducing a crest factor of the original waveform, generating an error signal by subtracting out the original waveform from the distortion signal, generating a conditioned waveform by adding the error signal to the original waveform, and amplifying the conditioned waveform. The crest factor of the original waveform may be reduced based on spectral mask requirements. The crest factor of the original waveform may be reduced using a limiter. The power amplifier may comprise a programmable gain amplifier (PGA). The distortion signal may be generated based on a PGA model and/or a predistortion model. A signal from an output of the PA may be fed back to the PGA model. The PGA model may be dynamically configured. The crest factor of the original waveform may be reduced in an analog domain and/or a digital domain. The error signal may be filtered utilizing a distortion shaping filter.

Abstract translation: 用于波峰因数降低的方法和系统可以包括产生原始波形，通过减小原始波形的波峰因数产生失真信号，通过从失真信号中减去原始波形产生误差信号，通过将 误差信号到原始波形，并放大调节波形。 可以基于光谱掩模要求来减小原始波形的波峰因数。 原始波形的波峰因数可以使用限幅器来减小。 功率放大器可以包括可编程增益放大器（PGA）。 可以基于PGA模型和/或预失真模型来生成失真信号。 来自PA的输出的信号可以被反馈到PGA模型。 可以动态配置PGA模型。 在模拟域和/或数字域中，原始波形的波峰因数可能会降低。 可以使用失真整形滤波器对误差信号进行滤波。