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New resistorless and electronically tunable realization of dual-output VM all-pass filter using VDIBA

Published: 01 January 2013 Publication History

Abstract

In this paper, a new active element called voltage differencing inverting buffered amplifier (VDIBA) is presented. Using single VDIBA and a capacitor, a new resistorless voltage-mode (VM) first-order all-pass filter (APF) is proposed, which provides both inverting and non-inverting outputs at the same configuration simultaneously. The pole frequency of the filter can be electronically controlled by means of bias current of the internal transconductance. No component-matching conditions are required and it has low sensitivity. In addition, the parasitic and loading effects are also investigated. By connecting two newly introduced APFs in open loop a novel second-order APF is proposed. As another application, the proposed VM APF is connected in cascade to a lossy integrator in a closed loop to design a four-phase quadrature oscillator. The theoretical results are verified by SPICE simulations using TSMC 0.18 μm level-7 CMOS process parameters with 0.9 V supply voltages. Moreover, the behavior of the proposed VM APF was also experimentally measured using commercially available integrated circuit OPA860 by Texas Instruments.

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      Published In

      cover image Analog Integrated Circuits and Signal Processing
      Analog Integrated Circuits and Signal Processing  Volume 74, Issue 1
      January 2013
      288 pages

      Publisher

      Kluwer Academic Publishers

      United States

      Publication History

      Published: 01 January 2013

      Author Tags

      1. All-pass filter
      2. Analog signal processing
      3. Electronically tunable circuit
      4. Four-phase quadrature oscillator
      5. Loading effect
      6. Resistorless filter
      7. Voltage differencing inverting buffered amplifier (VDIBA)
      8. Voltage-mode

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      • (2015)A 0.13- $\mu $ m CMOS Current-Mode All-Pass Filter for Multi-GHz OperationIEEE Transactions on Very Large Scale Integration (VLSI) Systems10.1109/TVLSI.2014.238082023:12(2813-2818)Online publication date: 1-Dec-2015
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