A low-transconductance OTA with improved linearity suitable for low-frequency Gm-C filters

Soares, Carlos Fernando Teodósio; Moraes, Gustavo S. de; Petraglia, Antonio

doi:10.1016/j.mejo.2014.07.008

Cited by 38 publications

(23 citation statements)

References 38 publications

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“…However, the input referred noise of the OTA using the attenuator [5] is very large as compared with the other OTAs. Note that, the OTA [5] uses the improved attenuator for improvement of the input referred noise. And, the input referred noise of the OTA using a kind of bulk driven scheme [7] is deteriorated.…”

Section: Simulationmentioning

confidence: 99%

“…In the table, the Efficiency of Gm means the transconductance Gm(0) divided by the power consumption. The transconductors using the current division scheme [3] and the attenuated input voltage scheme [5] have a good linearity of the transfer characteristics. However, the input referred noise of the OTA using the attenuator [5] is very large as compared with the other OTAs.…”

Section: Simulationmentioning

confidence: 99%

“…The transconductors using the current division scheme [3] and the attenuated input voltage scheme [5] have a good linearity of the transfer characteristics. However, the input referred noise of the OTA using the attenuator [5] is very large as compared with the other OTAs. Note that, the OTA [5] uses the improved attenuator for improvement of the input referred noise.…”

Section: Simulationmentioning

confidence: 99%

“…To realize the low-transconductance linear transconductor, the current division scheme [2,3] and the attenuated input voltage scheme [4,5] have been proposed. In the current division scheme, a part of the signal current of the linear transconductor operating in strong inversion region is used as an output current to reduce the transconductance.…”

Section: Introductionmentioning

confidence: 99%

“…However, the current division scheme has a problem that high-power is needed for the scheme, or large MOSFETs are needed. For the low-power, a linear transconductor operating in subthreshold region using the attenuated input voltage scheme [4,5] have been proposed. In addition, the bulk-driven transconductor [6], which is a kind of the attenuated input voltage scheme, has been proposed.…”

Section: Introductionmentioning

confidence: 99%

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A low-power and low-Gm linear transconductor utilizing control of a threshold voltage

Ohbuchi

Matsumoto

2015

Analog Integr Circ Sig Process

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For medical devices, low frequency applications are required. Thus, a linear transconductor which has a very low transconductance is needed. A conventional low-power and low-transconductance transconductor operating in subthreshold region using the source-degeneration has a problem that the linear input range is limited because the drain-source resistance for the source-degeneration is changed by the input voltage. This paper proposes a linear transconductor that is realized by the scheme that the threshold voltages of the transistors are changed by the attenuated input voltage using body effect and reverse short-channel effect. The proposed transconductor is optimally designed using maximally flat approximation method and Newton-Raphson method. The characteristics of the proposed transconductor are confirmed by simulation. The 1 % linear input range, which is around 110 mV, is improved as compared with the conventional transconductor. The 1 % linear input range is defined as the maximum differential input voltage that the error of the transconductance is within 1 %. The power consumption is 881 nW for the transconductance G m ¼ 1:05 lS when the input voltage is 0 V. The THD is around À60 dB for the amplitude of the input voltage is 125 mV under the condition that the frequency of the sinusoidal input voltage is 100 Hz. The power consumption, the input referred noise, and the frequency characteristics are not deteriorated even using the proposed technique. The simulation results show the validity and availability of the proposed transconductor.

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Section: Simulationmentioning

confidence: 99%