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Truly Mixed-Mode Universal Filter Capable of Operation in MISO and SIMO Configurations with Quadrature Oscillator as an Application
Author(s)
Date Issued
January 1, 2026
Type
Article
Abstract
A versatile mixed-mode universal filter with electronic tunability is proposed in this research. The filter employs a modified differential voltage current conveyor transconductance amplifier (M-DVCCTA) as the active block. Without modifying the circuit topology, the mixed mode filter operates in single input multi-output (SIMO) and multi input single output (MISO) configurations. In addition, as an application the proposed filter is configured as a dual-mode quadrature oscillator. The designed filter can implement all five generic filter functions in voltage-mode (VM), current-mode (CM), transimpedance-mode (TIM), and transadmittance-mode (TAM). The filter design requires two M-DVCCTAs, two grounded capacitors and three resistors for implementation. To obtain VM and TIM outputs in SIMO configuration, three extra resistors are necessary. All the resistors used are active MOSFET-based resistors with variable resistance. The parasitic, non-ideal gain, and sensitivity analysis are conducted to gauge the effects of process variations and passive components spread on the filter performance. The circuit implementation and layout design of the M-DVCCTA is done in Cadence Virtuoso using 0.18-µm GPDK. The M-DVCCTA occupies an area of 63.71 * 45.66 µm2. The filters and oscillator are tested at a frequency of 3.98 MHz at ± 0.9 V supply voltage. The Monte Carlo analysis, processes corner analysis and total harmonic distortion analysis are performed to examine the robustness of the proposed designs. The simulation and theoretical results show good correlation.
Citation
Circuits Systems and Signal Processing, 45(1), 74-115, 2026