A Low-Voltage Electronically Tunable MOSFET-C Voltage-Mode First-Order All-Pass Filter Design

This paper presents a simple electronically tunable voltage-mode first-order all-pass filter realization with MOSFET-C technique. In comparison to the classical MOSFET-C filter circuits that employ active elements including large number of transistors the proposed circuit is only composed of a single two n-channel MOSFET-based inverting voltage buffer, three passive components, and one NMOS-based voltage-controlled resistor, which is with advantage used to electronically control the pole frequency of the filter in range 103 kHz to 18.3 MHz. The proposed filter is also very suitable for low-voltage operation, since between its supply rails it uses only two MOSFETs. In the paper the effect of load is investigated. In addition, in order to suppress the effect of non-zero output resistance of the inverting voltage buffer, two compensation techniques are also introduced. The theoretical results are verified by SPICE simulations using PTM 90 nm level-7 CMOS process BSIM3v3 parameters, where +/- 0.45 V supply voltages are used. Moreover, the behavior of the proposed filter was also experimentally measured using readily available array transistors CD4007UB by Texas Instruments

Voltage-Mode All-Pass Filters Using Universal Voltage Conveyor and MOSFET-Based Electronic Resistors

The paper presents two novel realizations of voltage-mode first-order all-pass filters. Both circuits use single universal voltage conveyor (UVC), single capacitor, and two grounded resistors. Using the two NMOS transistors-based realizations of the electronic resistor with two symmetrical power supplies, presented all-pass filter circuits can be easily made electronically tunable. Proposed filter structures provide both inverting and non-inverting outputs at the same configuration simultaneously and they have high-input and low-output impedances that are desired for easy cascading in voltage-mode operations. The nonidealities of the proposed circuits are also analyzed and compared. The theoretical results of both circuits are verified by SPICE simulations using TSMC 0.35 μm CMOS process parameters. Based on the evaluation, the behavior of one of the circuits featuring better performance was also experimentally measured using the UVC-N1C 0520 integrated circuit

A new differential configuration suitable for realization of high CMRR, all-pass/notch filters

#yayıncısurumuyok# ; Tam metin hakemden geçmiş kopyadır.In this paper, a new configuration suitable for realization of differential input-differential output first order, second order all-pass and notch filters with high CMRR is given. The proposed configuration uses two negative type second-generation current conveyors (CCII-), and three admittances. Two first order and one second order all-pass filters and a notch filter (tunable if current controlled conveyor CCCII is used) are extracted from the proposed configuration. Tracking error, element mismatch, sensitivity analysis, simulation and experimental results are included

A New All-Pass Section For High-Performance Signal Processing With A Single Ccii-

This paper presents a new all-pass section (APS) employing a negative-type second-generation current conveyor (CCII-), two resistors and a grounded capacitor, which is important from the integrated circuit (1C) implementation point of view. The use of the grounded capacitor allows the 1C implementation with standard CMOS technologies. This circuit is also suitable for the realization by using current controlled current conveyor (CCCII) as active element. In this case the current-controlled intrinsic x-terminal resistance of the conveyor realizes one resistor and the circuit employs only one external resistor and one grounded capacitor. The proposed circuit is verified with SPICE simulations and experimental results. © 2003, by Walter de Gruyter GmbH & Co. All rights reserved

Novel lossless grounded inductance simulators employing only a single first generation current conveyor

In this paper novel lossless grounded inductance simulators employing only a single first-generation current conveyor are proposed. Time and frequency domain performances of one of the proposed circuits are demonstrated

Novel lossless floating immittance simulator employing only two FTFNs

In this paper a novel lossless floating immittance simulator employing only two FTFNs is reported. The presented topology enables the simulation of ideal floating inductance, FDNR and resistively variable capacitor. No component matching constraints are imposed for the realisations. The performance of the proposed floating immittance is demonstrated on a fifth order elliptic filter

A new four terminal floating nullor based single-input three-output current-mode multifunction filter

In this study, a new circuit configuration to realise a current-mode multifunction filter is presented. The circuit uses four four terminal floating nullors (FTFNs) and six passive components, four of them are grounded and can simultaneously realise low-pass, band-pass and high-pass filter functions without changing the circuit topology and elements. It does not require any parameter matching condition and has the possibility of independent adjustment of omega(o) without disturbing omega(o)/Q. Sensitivity analysis of the filter shows that it has low passive sensitivities and omega(o), Q and omega(o)/Q of the filter are insensitive to current tracking errors, furthermore omega(o) of the filter is insensitive to voltage tracking errors of the FTFNs. All outputs of the multifunction filter exhibit high output impedances so that the synthesised current-mode filters can be cascaded without additional buffers. The theoretical results are verified by PSPICE simulations. (C) 1999 Elsevier Science Ltd. All rights reserved

Novel transimpedance type first-order all-pass filter using single OTRA

A novel transimpedance-mode first-order all-pass filter configuration is proposed. It uses a single operational transresistance amplifier (OTRA) and few passive components. The proposed circuit is structurally all-pass that does not impose any component matching condition. The proposed circuit is insensitive to parasitic input capacitances and input resistances due to the internally grounded input terminals of the OTRA. It provides an alternative realization of phase equalizers for analog signal processing applications by providing also current-to-voltage conversion. The theoretical results are verified with PSPICE simulations using a CMOS realization of OTRA