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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A 2.5-V active low-pass filter using all-n-p-n Gilbert cells with a 1-V/sub p-p/ range
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A 2.5-V active low-pass filter using all-n-p-n Gilbert cells with a 1-V/sub p-p/ range

机译:使用全n-p-n吉尔伯特单元,范围为1V / sub p-p /的2.5V有源低通滤波器

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摘要

This paper describes the design and measured results of an all-n-p-n low-voltage (2.5 V), low-current (1 mA), large-swing (1 V/sub p-p/), low-distortion (-53 dB, 1 V/sub p-p/) active filter using a conventional bipolar process. The transconductors for the filter are composed of Gilbert cell transconductors. Distortion has been improved by feedback circuits without increasing the supply voltage and without using p-n-p transistors. The filter is a gyrator-capacitor type third-order Butterworth low-pass filter with a nominal cutoff frequency of 192 kHz. A voltage scaling technique has been applied directly to the gyrator-capacitor filter. This has improved the signal-to-noise ratio by 3 dB. Simulation results indicated that a fast operation up to tens of MHz is possible with a standard bipolar process, as the signal path is composed only of n-p-n transistors.
机译:本文介绍了全npn低压(2.5 V),低电流(1 mA),大摆幅(1 V / sub pp /),低失真(-53 dB,1)的设计和测量结果V / sub pp /)有源滤波器,使用传统的双极工艺。过滤器的跨导器由吉尔伯特单元跨导器组成。通过反馈电路可以改善失真,而无需增加电源电压,也无需使用p-n-p晶体管。该滤波器是回旋电容器型三阶巴特沃思低通滤波器,其标称截止频率为192 kHz。电压缩放技术已直接应用于回转电容器电容器。这将信噪比提高了3 dB。仿真结果表明,使用标准的双极工艺可以实现高达数十MHz的快速操作,因为信号路径仅由n-p-n晶体管组成。

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