A fully differential and tunable CMOS current mode opamp based on transimpedance-transconductance technique

Assi, Ali; Raut, R.

doi:10.1109/mwscas.1997.666060

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…The realization in [2, 3] offers a slightly higher differential gain and higher output current swing but on the expense of the bandwidth and the power consumption, and the input offset current is two orders of magnitude higher. While the realization in [14] offers a tunable gain that is much higher than the gain of the proposed circuit and dissipates a less amount of power, but it provides a very small output swing. Finally, the realization in [13] provides a slightly higher bandwidth and a higher output swing, but on the expense of the power dissipation and it suffers from a small CMRR.…”

Section: Simulation Results Of the Proposed Coamentioning

confidence: 99%

“…Finally, the realization in [13] provides a slightly higher bandwidth and a higher output swing, but on the expense of the power dissipation and it suffers from a small CMRR. Some specifications were unavailable in [2,3] and [13,14] for the comparison between the differential input COAs. To demonstrate the low input offset current, and input resistance Table 2 presents a comparison between the simulated results obtained from the proposed circuit and the reported specifications for single input COAs.…”

Section: Simulation Results Of the Proposed Coamentioning

confidence: 99%

“…Recently, various CMOS implementations for the single input balanced output COA were reported [2,3,[6][7][8][9][10][11][12]. While a few implementations for the differential input balanced output COA were presented in [2,3,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The realizations reported in [13,14] are based on cascading a transresistance and transconductance amplifiers. The first stage is a high gain transresistance amplifier to convert the two input currents into two differential voltages, followed by a high gain transconductance amplifier to convert the two voltages into two balanced currents.…”

Section: Introductionmentioning

confidence: 99%

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A Novel CMOS Realization of the Differential Input Balanced Output Current Operational Amplifier and its Applications

Youssef

Soliman

2005

Analog Integr Circ Sig Process

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In this paper a new realization of the differential input balanced output current opamp is proposed, operating with ±1.5 V supplies. Its architecture is based on the use of current inverters to sense the input currents while providing a very low input resistance, 23 . The opamp provides a maximum output swing of 700 µA, with an input offset current of 3.5 nA. The differential gain achieved is 65.5 dB, and the differential structure adopted in the design provided a high CMRR, 89.5 dB, the proposed circuit is compared to other realizations with single and differential inputs. The applications of the current opamp are exploited some new applications are presented such as: MOSFET-C integrators, full non-linearity cancellation for MOS transistors, and finally a digitally tuned current-mode variable gain amplifier, which has a gain tuning range of 25 dB with a 0.05 dB step.

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Section: Simulation Results Of the Proposed Coamentioning

confidence: 99%

Section: Simulation Results Of the Proposed Coamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel CMOS Realization of the Differential Input Balanced Output Current Operational Amplifier and its Applications

Youssef

Soliman

2005

Analog Integr Circ Sig Process

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“…Transconductor blocks connected in parallel are activated and deactivated by controlling their power supply as it was done for a programmable current amplifier [9]. The aim of this work is to build a filter operating at high frequencies.…”

Section: Introductionmentioning

confidence: 99%

Field programmable Gm-C array for wide frequency range bandpass filter applications

Lebel

Assi²

2005 IEEE International Symposium on Circuits and Systems

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A new programmable bandpass filter approach is presented. It is based on an array of fully differential transconductance circuits to control the filter parameters. The signal path does not contain any switch and fine-tuning of the filter parameters is implemented using programmable capacitors. The filter circuit is based on a biquad topology and designed with CMOS 0.18µm technology. SpectreS simulation results show a power consumption less than 5.2 mW with a ±0.9 V power supply. In addition, a wide frequency range (10-126 MHz) is achieved. The quality factor can also be tuned from 0.1 to 10.6.

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Assi

1999

Analog Integrated Circuits and Signal Processing

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A fully differential and tunable CMOS current mode opamp based on transimpedance-transconductance technique

Cited by 3 publications

References 5 publications

A Novel CMOS Realization of the Differential Input Balanced Output Current Operational Amplifier and its Applications

A Novel CMOS Realization of the Differential Input Balanced Output Current Operational Amplifier and its Applications

Field programmable Gm-C array for wide frequency range bandpass filter applications

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