A synthesis of a novel current-mode operational amplifier

Nagasaku, Toshiyuki; Hyogo, Akira; Sekine, Keitaro

doi:10.1007/bf00174252

Cited by 12 publications

(5 citation statements)

References 1 publication

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“…Several variants of COA (also known as TCOA -True Current Operational Amplifier) were described in [7], [8], [9], and [10] together with their possible internal structures designed in MOS or bipolar technologies. COA has a differential (sometimes also through) current input and one or multiple current outputs.…”

Section: Current Operational Amplifiermentioning

confidence: 99%

Second-Order State-Variable Filter with Current Operational Amplifiers

Kubánek

Vrba

2008

Third International Conference on Systems (Icons 2008)

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A design of the second-order filter based on the state-variable canonic structure is described. The filter operates in current mode and offers low-pass and band-pass transfer functions simultaneously. Current operational amplifiers are used as main active building blocks. An analysis of the influence of amplifier real properties on the filter characteristics is presented. The shifts of filter poles and appearance of new parasitic zeros is observed. Computer simulation with a bipolar model of current operational amplifier was used for verification of the filter functionality.

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Section: Current Operational Amplifiermentioning

confidence: 99%

Second-Order State-Variable Filter with Current Operational Amplifiers

Kubánek

Vrba

2008

Third International Conference on Systems (Icons 2008)

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“…The most popular types of current buffers are the common gate (CG) in CMOS technology and common base (CB) in BJT technology [8] which are employed in current mode circuits [9,10]. These simple current buffers have two main problems.…”

Section: Introductionmentioning

confidence: 99%

“…For example negative feedback method and compensation method [11] each has its own drawbacks. Secondly and more importantly, they are in single-input single-output arrangement as is seen from [10]. By increasing the mixed-mode circuit applications, fully differential structures become more demanded in analog part of the design due to ability to provide more immunity to power supply noises, clock feed through, interferences and other types of common mode disturbances [12].…”

Section: Introductionmentioning

confidence: 99%

A high CMRR low power fully differential Current Buffer

Azhari

Safari

2010

IEICE Electron. Express

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Abstract:In this paper a low power fully differential current buffer is introduced which performs high CMRR exploiting a novel method to alleviate common mode gain. The proposed current buffer is designed and simulated with HSPICE in 0.18 μm CMOS process and supply voltage of ±0.75 V. The simulation results show an 8.48 Ω input resistance, 98 dB CMRR, 369 MHz bandwidth and power dissipation of 135 μW. The corner case simulation has been done which shows an acceptable performance for the proposed buffer in all situations. The proposed circuit tends to be the fundamental block of a new family of electronic differential topologies greatly capable to be much further improved and utilized.

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“…However in the last decade current-mode signal-processing circuits have been demonstrated and well appreciated over their voltage-mode counterparts due to the main featuring of wide bandwidth capability. Designs for active filter circuits using high performance active devices, such as, operational amplifier(OA), operational transconductance amplifier(OTA), second generation current conveyor(CCII) and so on, have been discussed previously [1][2] . Due to the fact that active filter designs utilizing the finite and complex gain nature of an internally compensated type operational amplifier are suitable for integrated circuit(IC) fabrication and high frequency operation.…”

Section: Introductionmentioning

confidence: 99%

Realization of Lowpass and Bandpass Leapfrog Filters Using OAs and CCCIIs

Yang

Peng

2009

2009 International Conference on Management and Service Science

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The systematic procedure for realizing lowpass and bandpass leapfrog ladder filters using only active elements is presented. The proposed architecture is composed of only two fundamental active building blocks, i.e., an operational amplifier(OA) and a Current Controlled Conveyor II (CCCII), without external passive element requirement, making the approach conveniently for further integrated circuit implementation with systematic design and dense layout. The characteristic of the current transfer function can be adjusted by varying the external bias currents of CCCIIs. As illustrations to demonstrate the systematic realization of current-mode ladder filters, a 3rd-order Butterworth low-pass filter and a 6th-order Chebyshev bandpass filter are designed and simulated using PSPICE.

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A synthesis of a novel current-mode operational amplifier

Cited by 12 publications

References 1 publication

Second-Order State-Variable Filter with Current Operational Amplifiers

Second-Order State-Variable Filter with Current Operational Amplifiers

A high CMRR low power fully differential Current Buffer

Realization of Lowpass and Bandpass Leapfrog Filters Using OAs and CCCIIs

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