Analytical synthesis of current-mode even-Nth-order single-ended-input OTA and equal-capacitor elliptic filter structure with the minimum components

A new tunable CMOS FDNR circuit is proposed. The circuit is based on the transcapacitive gyrator approach with both transcapacitive stages realized by MOS transistors configuration. This FDNR element lends itself well to the design of low-pass ladder filters and its use will result in a more efficient integrated circuit implementation than filters that simulate floating inductors utilizing resistive gyrators. The applications of FDNR to realize a current-mode fifth-order elliptic filter and current mode sixth-order elliptic band-pass filter are given. The proposed FDNR is simulated using CMOS TSMC 0.35 μm technology. Simulation results are given to confirm the theoretical analysis.

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HIGH-ORDER MULTIPLE-MODE AND TRANSADMITTANCE-MODE OTA-C UNIVERSAL FILTERS

Journal of Circuits System and Computers ◽

10.1142/s021812661250048x ◽

2012 ◽

Vol 21 (05) ◽

pp. 1250048 ◽

Cited By ~ 4

Author(s):

CHEN-NONG LEE

Keyword(s):

Current Mode ◽

High Order ◽

Point Of View ◽

Chip Area ◽

Operational Transconductance Amplifiers ◽

Filter Structure ◽

Multiple Mode ◽

Input Signals ◽

Theoretical Predictions ◽

Low Sensitivity

This paper presents two new high-order OTA-C universal filters. The first proposed filter structure employs n + 3 operational transconductance amplifiers (OTAs) and n grounded capacitors, which can realize nth-order multiple-mode (including voltage, current, transadmittance, and transimpedance modes) universal filtering responses (lowpass, highpass, bandpass, bandreject, and allpass) from the same topology. Since the OTA has high input and output impedances, it is very suitable for transadmittance-mode circuit applications. Therefore, a new high-order transadmittance-mode OTA-C universal filter structure using the minimum components is introduced. The second proposed filter structure uses only n + 1 OTAs and n grounded capacitors, which are the minimum components necessary for realizing nth-order transadmittance-mode universal filtering responses (lowpass, highpass, bandpass, bandreject, and allpass) from the same topology. This represents the attractive feature from chip area and power consumption point of view. Moreover, the two new OTA-C universal filters still enjoy many important advantages: no need of extra inverting or double-type amplifiers for special input signals, using only n grounded capacitors, no need of any resistors, cascadably connecting the former voltage-mode stage and the latter current-mode stage, and low sensitivity performance. H-Spice simulations with TSMC 0.35 μm process and ±1.65 V supply voltages are included and confirm the theoretical predictions.

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Current mode filter structure based on dual output transconductance ampifiers

Electronics Letters ◽

10.1049/el:19960016 ◽

1996 ◽

Vol 32 (1) ◽

pp. 25 ◽

Cited By ~ 12

Author(s):

B. Al-Hashimi

Keyword(s):

Current Mode ◽

Filter Structure

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Low Sensitivity Single-Ended-Input OTA and Grounded Capacitor Elliptic Filter Structure with the Minimum Components

2005 IEEE International Symposium on Circuits and Systems ◽

10.1109/iscas.2005.1464710 ◽

2005 ◽

Author(s):

Shu-Hui Tu ◽

J.N. Ross

Keyword(s):

Elliptic Filter ◽

Filter Structure ◽

Low Sensitivity

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CCII-Based Nth-Order Mixed Mode Elliptic Filter with Grounded R and C

Journal of Circuits System and Computers ◽

10.1142/s0218126615500358 ◽

2015 ◽

Vol 24 (03) ◽

pp. 1550035 ◽

Cited By ~ 4

Author(s):

K. Ghosh ◽

B. N. Ray

Keyword(s):

Integrated Circuit ◽

Mixed Mode ◽

Passive Components ◽

Elliptic Filter ◽

Filter Structure ◽

Integrated Circuit Fabrication ◽

Circuit Fabrication ◽

Even Order ◽

Low Sensitivity ◽

Synthesis Methodology

This paper presents a new nth-order elliptic filter structure with second generation current conveyor (CCII). Synthesis methodology for mixed mode odd and even order filter is proposed. The designed structure is emphasized on the basis of implementation of integrated circuit fabrication by using grounded passive components (resistors and capacitors). The proposed structure is designed for different point of interests: (i) no component constraint, (ii) the structure is compatible with equal capacitance design, which is suitable for integrated circuit fabrication, (iii) low sensitivity like LC ladder filter and (iv) nearly null group sensitivity. To validate the theory, HSPICE simulation with 0.13-μm process and BSIM level 53 model is carried with ±1.5 V power supply.

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