Purpose

This paper aims to achieve two main objectives. First, to introduce to the literature a new versatile active building block, namely, voltage differencing differential voltage current conveyor (VD-DVCC) for analog signal processing applications. Second, to design a novel electronically tunable mixed-mode universal filter. The designed filter provides low-pass, high-pass, band-pass, band-reject and all-pass responses in voltage-mode (VM), current-mode (CM), trans-impedance-mode (TIM) and trans-admittance-mode (TAM).

Design/methodology/approach

The proposed filter uses two VD-DVCCs, three resistors and two capacitors. All the capacitors used are grounded, which is advantageous from the monolithic integration point of view. The VD-DVCC is designed and validated in Cadence software using CMOS 0.18 µm process design kit from Silterra Malaysia at a supply voltage of ±1 V.

Findings

The proposed novel filter enjoys many attractive features including as follows: the ability to operate in all four modes, no requirement of capacitive matching, tunability of quality factor (Q) independent of pole frequency, availability of both inverting and non-inverting outputs for VM and TIM mode, high output impedance explicit current output for CM and TAM, no requirement for double/negative input signals (voltage/current) for response realization and low active and passive sensitivities. The filter is designed for a pole frequency of 5.305 MHz. The obtained results bear a close resemblance with the theoretical findings.

Originality/value

The proposed novel filter structure requires a minimum number of active and passive components and provides operation in all four operating modes. The filter will find application in structures of mixed-mode systems.

中文翻译：

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采用接地电容器的电子可调谐混合模式通用滤波器，采用高度通用的 VD-DVCC

目的

本文旨在实现两个主要目标。首先，向文献介绍一种新的多功能有源构建块，即用于模拟信号处理应用的电压差差分电压电流传送器 (VD-DVCC)。其次，设计一种新型电子可调谐混合模式通用滤波器。设计的滤波器在电压模式 (VM)、电流模式 (CM)、跨阻抗模式 (TIM) 和跨阻抗模式下提供低通、高通、带通、带阻和全通响应导纳模式（TAM）。

设计/方法/途径

建议的滤波器使用两个 VD-DVCC、三个电阻器和两个电容器。所有使用的电容器都接地，从单片集成的角度来看这是有利的。VD-DVCC 在 Cadence 软件中使用来自 Silterra Malaysia 的 CMOS 0.18 µm 工艺设计套件在 ±1 V 的电源电压下进行设计和验证。

发现

所提出的新型滤波器具有许多吸引人的特性，包括如下：能够在所有四种模式下运行、无需电容匹配、品质因数 ( Q ) 的可调性（与极点频率无关）、VM 的反相和非反相输出的可用性TIM 模式，CM 和 TAM 的高输出阻抗显式电流输出，响应实现不需要双/负输入信号（电压/电流），主动和被动灵敏度低。该滤波器设计用于 5.305 MHz 的极点频率。所得结果与理论研究结果非常相似。

原创性/价值

所提出的新型滤波器结构需要最少数量的有源和无源元件，并提供所有四种工作模式。该滤波器将在混合模式系统的结构中得到应用。