A wide dynamic range low power 2× time amplifier using current subtraction scheme

H. Molaei, Ata Khorami, K. Hajsadeghi
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引用次数: 4

Abstract

The most challenging issue of conventional Time Amplifiers (TAs) is their limited Dynamic Range (DR). This paper presents a mathematical analysis to clarify principle of operation of conventional 2× TA's. The mathematical derivations release strength reduction of the current sources of the TA is the simplest way to increase DR. Besides, a new technique is presented to expand the Dynamic Range (DR) of conventional 2× TAs. Proposed technique employs current subtraction in place of changing strength of current sources using conventional gain compensation methods, which results in more stable gain over a wider DR. The TA is simulated using Spectre-rf in TSMC 0.18um COMS technology. DR of the 2× TA is expanded to 300ps only with 9% gain error while it consumes only 28uW from a 1.2V supply voltage.
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采用电流减法的宽动态范围低功率2倍时间放大器
传统时间放大器最具挑战性的问题是其有限的动态范围(DR)。本文通过数学分析,阐明了传统2× TA的工作原理。通过数学推导降低TA电流源的释放强度是提高DR的最简单方法,并提出了一种扩大传统2x TA动态范围的新方法。该技术采用电流减法来代替使用传统增益补偿方法改变电流源的强度,从而在更宽的dr上获得更稳定的增益。2xta的DR扩展到300ps,只有9%的增益误差,而它在1.2V电源电压下仅消耗28uW。
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