A Novel CMOS OTA Based on Body-Driven MOSFETs and its Applications in OTA-C Filters

The operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Traditional OTAs suffer linearity reduction as a result of the MOSFET scaling trend. In this paper, a body-driven (BD) CMOS triode-based fully balanced OTA is propos...

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Vydáno v:IEEE transactions on circuits and systems. I, Regular papers Ročník 54; číslo 6; s. 1204 - 1212
Hlavní autoři: Xuguang Zhang, Xuguang Zhang, El-Masry, E.I
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.06.2007
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Amplifiers
Body driven (BD)
CMOS
CMOS process
Construction
continuous-time filters
Feedback
Feedforward
Filters
Frequency
Linearity
MOSFETs
Noise levels
Operational amplifiers
operational transconductance amplifier (OTA)
OTA-C filter
Transconductance
Tuning
Voltage
ISSN:1549-8328, 1558-0806
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Abstract The operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Traditional OTAs suffer linearity reduction as a result of the MOSFET scaling trend. In this paper, a body-driven (BD) CMOS triode-based fully balanced OTA is proposed to achieve low distortion and linear frequency tuning. In contrast to the gate-driven based OTAs (that have the tradeoff of input and tuning range), BD-based OTAs operate under a wide input range over a large tuning interval. Common-mode (CM) feedforward and CM feedback schemes have been developed so that the CM voltage varies only 7 mV over a tuning range of 1.2 V = Vtune = 1.58 V. Using the 0.18-mum N-well CMOS process, a third-order elliptic low-pass filter is implemented with the aid of the proposed OTA. The total harmonic distortion ( is -45 dB for 0.8-V peak-peak (Vpp) fully differential input signals. A dynamic range of 45 dB is obtained with the OTA's noise integrated over 1 MHz.
AbstractList The operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Traditional OTAs suffer linearity reduction as a result of the MOSFET scaling trend. In this paper, a body-driven (BD) CMOS triode-based fully balanced OTA is proposed to achieve low distortion and linear frequency tuning. In contrast to the gate-driven based OTAs (that have the tradeoff of input and tuning range), BD-based OTAs operate under a wide input range over a large tuning interval. Common-mode (CM) feedforward and CM feedback schemes have been developed so that the CM voltage varies only 7 mV over a tuning range of 1.2 V = Vtune = 1.58 V. Using the 0.18-mum N-well CMOS process, a third-order elliptic low-pass filter is implemented with the aid of the proposed OTA. The total harmonic distortion ( is -45 dB for 0.8-V peak-peak (Vpp) fully differential input signals. A dynamic range of 45 dB is obtained with the OTA's noise integrated over 1 MHz.
Common-mode (CM) feedforward and CM feedback schemes have been developed so that the CM voltage varies only 7 mV over a tuning range of 1.2 V = Vtune = 1.58 V. Using the 0.18-mum N-well CMOS process, a third-order elliptic low-pass filter is implemented with the aid of the proposed OTA.
The operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Traditional OTAs suffer linearity reduction as a result of the MOSFET scaling trend. In this paper, a body-driven (BD) CMOS triode-based fully balanced OTA is proposed to achieve low distortion and linear frequency tuning. In contrast to the gate-driven based OTAs (that have the tradeoff of input and tuning range), BD-based OTAs operate under a wide input range over a large tuning interval. Common-mode (CM) feedforward and CM feedback schemes have been developed so that the CM voltage varies only 7 mV over a tuning range of 1.2 V = Vtune = 1.58 V. Using the 0.18-mum N-well CMOS process, a third-order elliptic low-pass filter is implemented with the aid of the proposed OTA. The total harmonic distortion ( is -45 dB for 0.8-V peak-peak (Vpp) fully differential input signals. A dynamic range of 45 dB is obtained with the OTAas noise integrated over 1 MHz.
Author El-Masry, E.I.
Xuguang Zhang
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Snippet The operational transconductance amplifier (OTA) is one of the most significant building-blocks in integrated continuous-time filters. Traditional OTAs suffer...
Common-mode (CM) feedforward and CM feedback schemes have been developed so that the CM voltage varies only 7 mV over a tuning range of 1.2 V = Vtune = 1.58 V....
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SubjectTerms Amplifiers
Body driven (BD)
CMOS
CMOS process
Construction
continuous-time filters
Feedback
Feedforward
Filters
Frequency
Linearity
MOSFETs
Noise levels
Operational amplifiers
operational transconductance amplifier (OTA)
OTA-C filter
Transconductance
Tuning
Voltage
Title A Novel CMOS OTA Based on Body-Driven MOSFETs and its Applications in OTA-C Filters
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