差分电路跨导线性化改进CMOS射频增益放大器

E. Abiri, GholamReza Najibi, S. Najibi
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引用次数: 7

摘要

一个CMOS射频数字可编程增益放大器(RF PGA)采用0.25和0.5µm CMOS技术实现作为一个低中频调谐器IC的一部分。这是通过应用一种新提出的差分电路(跨导二阶导数)抵消技术实现的,称为差分多门控晶体管(DMGTR)。在DMGTR放大器中,采用跨导线性化的方法来提高线性度,这种方法可以通过将主晶体管的负峰值与具有不同尺寸的辅助晶体管的正峰值相抵消来实现,并且栅极驱动并联组合在适当的尺寸和偏置上。然而,这种增强受到谐波反馈的综合影响所产生的失真的限制,这种失真可以通过放大器的级联mtrr输出来大大降低。采用DMGTR实现了一个低功耗、高线性的射频PGA。在本文中,我们提出了一种新的差分电路线性度改进技术,称为差分多门控晶体管(DMGTR),以获得低功耗高线性射频PGA。这种技术不会损失其他性能或消耗额外的功率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improvement of CMOS RF Gain Amplifier Using Differential Circuit Transconductance Linearization
A CMOS RF digitally programmable gain amplifier (RF PGA) is implemented as a part of a low-IF tuner IC using 0.25 and 0.5µm CMOS technology. This is achieved by applying a newly proposed differential circuit (the second derivatives of transconductance) cancellation technique, called the differential multiple gated transistor (DMGTR). In the DMGTR amplifier, linearity is improved by using transconductance linearization which can be achieved by canceling the negative peak value of the main transistor with the positive one in the auxiliary transistor having a different size and gate drive combined in parallel which is properly sized and biased. This enhancement, however, is limited by the distortion originated from the combined influence of and harmonic feedback, which can greatly be reduced by the cascoding MGTR output for the amplifier. By adopting the DMGTR, a low-power highly linear RF PGA is implemented. In this article, we propose a new differential circuit linearity improvement technique, called the differential multiple gated transistor (DMGTR), in order to obtain a low-power highly linear RF PGA. This technique does not lose other performance or consume extra power.
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