Low-voltage CMOS transconductancecell based on parallel operation oftriode and saturation transconductors

Coban, A.L.; Allen, P.E.

doi:10.1049/el:19940756

Cited by 33 publications

(9 citation statements)

References 6 publications

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“…A transconductor based on parallel operation of saturation and triode mode is an effective way to reduce the third-order distortion [12]. In CMOS transconductors, mobility reduction and velocity saturation are the main source of nonlinearity.…”

Section: A Transconductormentioning

confidence: 99%

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

Kwon

2015

IEEE Trans. Circuits Syst. II

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In this paper, a 50-300 MHz CMOS Gm-C tracking low-pass filter has been presented to resolve a local oscillator harmonic-mixing problem for Advanced Television Systems Committee terrestrial and cable digital TV tuner integrated circuits. A Gm-C filter based on parallel operation of a transconductor biased in the saturation region with source degeneration and a transconductor biased in the triode region is chosen to achieve high linearity performance at the VHF/UHF frequency bands. The cutoff frequency of the proposed filter is tunable from 50 MHz to 300 MHz. The filter is implemented in a 0.18 μm CMOS technology and achieve a minimum input-referred noise density of 3 nV/√Hz and maximum in-band output-referred third-order intercept point of 20.7 dBm. It operates at a nominal supply voltage of 1.8 V with bias currents of 114 mA. The active die area is 1.1 mm 2 .

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Section: A Transconductormentioning

confidence: 99%

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

Kwon

2015

IEEE Trans. Circuits Syst. II

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“…The input stage of the transconductance amplifier is shown in Fig.2(e), where input transistors of the left figure side are in saturation, while the input transistors of the right side are in triode region. An idea of the design is to use a so called compensation principle firstly discussed in [19]. It is based on a fact that the third (more critical) harmonic of the MOS transistor current in saturation and triode regions has the opposite signs.…”

Section: A Cmos Transconductance Amplifier Designmentioning

confidence: 99%

Channel filters for microelectronic receivers of wireless systems

Коротков

Morozov

Tutyshkin

et al. 2005

2005 IEEE 7th CAS Symposium on Emerging Technologies: Circuits and Systems for 4G Mobile Wireless Communications

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A short overview of receiver architectures and low-pass filter specifications for wireless systems is reported. Two design procedures of lowpass filters for communication system are discussed. A CMOS transconductance-capacitor (G m -C) filter with enhanced linearity is presented as the first one. The proposed design is based on a transconductance amplifier with enhanced linearity. For the elimination of the amplifier harmonic level the compensation principle is used. The device was realized as a balanced fifth-order 1MHz low-pass Bessel filter in 0.35µm CMOS process. The filter operates with a low supply voltage of +2.5 Volt. Its power consumption is 8.25 mW, the input referred RMS noise is 120 µV (0.01 ÷ 2 MHz), and HD3 (1V P-to-P @ 1MHz) is -54 dB. Alternatively a new approach to the design of high-frequency filters with low power consumption is presented. The idea is to use current mode and voltage mode active elements with enhanced frequency range. These elements are second generation current conveyors and voltage buffers, those are used to implement integrators. The filter is realized as a switched-capacitor circuit based on an integrator chain with multi feedback loops. As an example a CMOS switched-capacitor filter with 1MHz cut-off frequency is presented. The device was realized as an unbalanced fifth-order low-pass Chebyshev filter in 0.35µm CMOS process. The filter operates with supply voltage varying from +2.5V to +3V. Depending on the supply voltage its power consumption is from 3 mW to 10 mW, the input referred RMS noise is 1.9 mV (0.02 ÷ 2 MHz@+3V), and HD3 (2V P-to-P @ 900kHz @ +3V) is -54 dB.Index Terms -High-frequency microelectronic filter, cell phones, Bluetooth, WLAN, DECT, low power consumption, G m -C filter, transconductance amplifier, second generation current conveyor, switched-capacitor filter, dummy switch, voltage buffer.

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“…In recent years, many techniques that improved the linearity of the operational transconductance amplifier (OTA) by combining the non-linear terms have been presented [1][2][3][4][5][6][7]. However, several techniques have reduced the effective transconductance, such as cross couple [1] and the HD3 feedforward techniques [2].…”

Section: Introductionmentioning

confidence: 99%

“…Mobility reduction compensation is to use two pair transistors which work in different regions. Since the phase of third-harmonic distortion is inversed, it can improve the linearity without losing effective transconductance [3][4][5]. One approach [3] uses a triode region transistor and a weak inversion transistor to compensate for third order harmonic distortion signal.…”

Section: Introductionmentioning

confidence: 99%

−65dBHD3 CMOS tunable OTA with mobility reduction compensation

Cheng

Chang

Hung

2011

Proceedings of 2011 International Symposium on VLSI Design, Automation and Test

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This paper presents a high linearity operational transconductance amplifier (OTA) base on the technique of mobility reduction compensation, which achieves great linearity improvement and has wide input range at low power consumption. The third-order harmonic distortion (HD3) of the OTA is about -65dB at 1MHz for a 1.2-V pp differential input. The OTA was designed by the TSMC 0.18-Pm CMOS process technology. For 1.8-V supply voltage, the static power consumption is only 0.427mW. I.978-1-4244-8499-7/11/$26.00 ©2011 IEEE

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Low-voltage CMOS transconductancecell based on parallel operation oftriode and saturation transconductors

Cited by 33 publications

References 6 publications

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

Channel filters for microelectronic receivers of wireless systems

−65dBHD3 CMOS tunable OTA with mobility reduction compensation

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Low-voltage CMOS transconductancecell based on parallel operation oftriode and saturation transconductors

Cited by 33 publications

References 6 publications

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

A 50- to 300-MHz CMOS <inline-formula> <tex-math notation="LaTeX">$Gm\mbox{-}C$</tex-math></inline-formula> Tracking Filter Based on Parallel Operation of Saturation and Triode Transconductors for Digital TV Tuner ICs

Channel filters for microelectronic receivers of wireless systems

&#x2212;65dBHD3 CMOS tunable OTA with mobility reduction compensation

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−65dBHD3 CMOS tunable OTA with mobility reduction compensation