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首页> 外文期刊>IEEE Journal of Solid-State Circuits >An enhanced adaptive Q-tuning scheme for a 100-MHz fully symmetric OTA-based bandpass filter
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An enhanced adaptive Q-tuning scheme for a 100-MHz fully symmetric OTA-based bandpass filter

机译：用于100 MHz基于完全对称OTA的带通滤波器的增强型自适应Q调谐方案

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摘要

A tuning scheme for continuous-time high-Q biquad filters is presented. An improvement over the existing implementation of the modified-LMS Q-tuning scheme is proposed and efficiently combined with the frequency tuning based on phase-locked loops. The proposed scheme takes much less area without compromising the accuracy achieved previously. The proposed unified Q- and f0-tuning scheme does not require the Q-tuning loop to be slower than the f0-tuning loop. The optimal case is to have equal speeds for both loops. Also, a low-voltage pseudo-differential operational transconductance amplifier with inherent common-mode feedforward is introduced. The structure is fully symmetric and suitable for high-frequency applications. An experimental test chip is fabricated in standard CMOS 0.5-Μm technology, with a bandpass filter of center frequency 100 MHz and Q of 20, along with the proposed tuning scheme. The measured Q-tuning error is around 1%. Expected and experimental results are in good agreement.
机译：提出了一种连续时间高Q双二阶滤波器的调谐方案。提出了对改进的LMS Q调谐方案的现有实现的改进，并与基于锁相环的频率调谐有效地结合在一起。所提出的方案占用更少的面积，而不会损害先前获得的精度。所提出的统一的Q和f0调整方案不需要Q调整环比f0调整环慢。最佳情况是两个循环的速度相等。此外，介绍了一种具有固有共模前馈的低压伪差分运算跨导放大器。该结构完全对称，适用于高频应用。实验测试芯片采用标准CMOS0.5-μm技术制造，带有中心频率100 MHz和Q为20的带通滤波器，以及拟议的调谐方案。测得的Q调谐误差约为1％。预期结果与实验结果吻合良好。

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