A wideband low-offset current-feedback op amp design

Koullias, I.A.

doi:10.1109/bipol.1989.69472

Cited by 17 publications

(6 citation statements)

References 2 publications

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“…The high-gain node is the collector connection of Q 7 and Q 8 . The output resistance at this node is the parallel 11 There are, of course, second-order limitations that affect the ultimate maximum slew rate of current feedback op-amps. There is some parasitic capacitance at the high-gain node.…”

Section: Example 131: An Admittedly Very Crude Current-feedback Op-amentioning

confidence: 99%

Review of Current Feedback Operational Amplifiers

Thompson¹

2014

Intuitive Analog Circuit Design

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Section: Example 131: An Admittedly Very Crude Current-feedback Op-amentioning

confidence: 99%

Review of Current Feedback Operational Amplifiers

Thompson¹

2014

Intuitive Analog Circuit Design

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“…This technique does degrade the CFOA's bandwidth because of an increase of the V,, impedance [3]. The other one is to scale IpNp and INpN in [3] with proper choice of the emitter areas. The second one is not suitable in CMOS CFOA design because of a much more dispersion of parameters in CMOS process than that in bipolar.…”

Section: Cfoas Principlementioning

confidence: 98%

“…The most popular one is to insert a diode-connected transistor in series with each emitter follower in [3], [5]. This technique does degrade the CFOA's bandwidth because of an increase of the V,, impedance [3].…”

Section: Cfoas Principlementioning

confidence: 99%

“…The V,, voltage, which is generated by M19-M22, is almost equal to that of V,, under the DC operating condition when a design match is taken between M19-M22 and MI, M2, M9, and M13. The addition of M17 and M18 as well as their bias current I b p and I b n respectively make it possible to reduce the supply voltage of CFOA to 4Vt, instead of 6Vt without them [3].…”

Section: Cfoas Principlementioning

confidence: 99%

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An offset compensated CMOS current-feedback operational-amplifier

Zhu

Arabi

Proceedings of ISCAS'95 - International Symposium on Circuits and Systems

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A new CMOS cirrrent;feedback opmational-amplger (CFOA) with a novel owchip current-mode input offset voltage compensation circuit is presented. The offset voltage is reduced to less than 1 mlr by varying the bias currents of the amplijkrS input bufser as a function of the mismatch between the NMOS and PMOS 5 ' s (Vi, and Vi$. The proposed compensalion technique is suitable for both CMOS and BJT CFOA designs without degrading their high-Pequency performance. As well, it is irrespective of process and temperature parame,ters because of its fully symmetrical architecture. Results of HSPICE simulation show that a GB W of around 100 MHz and a supply current of around 300 .uA are achievable in a CMOS CFOA.

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“…2. The core amplifier A is essentially a current-op-amp (CFOA) [7] and is highlighted by the broken-line rectangle.…”

Section: Practical Design Examplementioning

confidence: 99%

High accuracy, high speed voltage-follower

Lidgey

Su²

ISCAS '98. Proceedings of the 1998 IEEE International Symposium on Circuits and Systems (Cat. No.98CH36187)

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A novel design technique for a high-speed, highaccuracy voltage-follower is presented. The design is based on a floating negative-feedback technique which results in the commonly encountered trade-off between speed and accuracy being released. Details of the design principles are explained and a practical design example is described which is shown to exhibit simultaneously very high speed and very high accuracy.

show abstract

A wideband low-offset current-feedback op amp design

Cited by 17 publications

References 2 publications

Review of Current Feedback Operational Amplifiers

Review of Current Feedback Operational Amplifiers

An offset compensated CMOS current-feedback operational-amplifier

High accuracy, high speed voltage-follower

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