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In this paper the transfer function of a system with windowed current integration is discussed. This kind of integration is usually used in a sampling mixer and the current is generated by a transconductance amplifier (TA). The parasitic capacitance (*C*_{p}) and the output resistance of the TA (*R*_{o,TA}) before the sampling mixer heavily affect the performance. Calculations based on a model including the parasitic capacitance and the output resistance of the TA is carried out. Calculation results show that due to the parasitic capacitance, a notch at the sampling frequency appears, which is very harmful because it causes the gain near the sampling frequency to decrease greatly. The output resistance of the TA makes the depth of the notches shallow and decreases the gain near the sampling frequency. To suppress the effect of *C*_{p} and *R*_{o,TA}, an operational amplifier is introduced in parallel with the sampling capacitance (*C*_{s}). Simulation results show that there is a 17 dB gain increase while *C*_{s} is 1,pF, *g*_{m} is 9,mS, *N* is 8 with a clock rate of 800,MHz.

- Publication
- IEICE TRANSACTIONS on Electronics Vol.E91-C No.6 pp.871-878

- Publication Date
- 2008/06/01

- Publicized

- Online ISSN
- 1745-1353

- DOI
- 10.1093/ietele/e91-c.6.871

- Type of Manuscript
- Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)

- Category

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Ning LI, Win CHAIVIPAS, Kenichi OKADA, Akira MATSUZAWA, "Analysis of CMOS Transconductance Amplifiers for Sampling Mixers" in IEICE TRANSACTIONS on Electronics,
vol. E91-C, no. 6, pp. 871-878, June 2008, doi: 10.1093/ietele/e91-c.6.871.

Abstract: In this paper the transfer function of a system with windowed current integration is discussed. This kind of integration is usually used in a sampling mixer and the current is generated by a transconductance amplifier (TA). The parasitic capacitance (*C*_{p}) and the output resistance of the TA (*R*_{o,TA}) before the sampling mixer heavily affect the performance. Calculations based on a model including the parasitic capacitance and the output resistance of the TA is carried out. Calculation results show that due to the parasitic capacitance, a notch at the sampling frequency appears, which is very harmful because it causes the gain near the sampling frequency to decrease greatly. The output resistance of the TA makes the depth of the notches shallow and decreases the gain near the sampling frequency. To suppress the effect of *C*_{p} and *R*_{o,TA}, an operational amplifier is introduced in parallel with the sampling capacitance (*C*_{s}). Simulation results show that there is a 17 dB gain increase while *C*_{s} is 1,pF, *g*_{m} is 9,mS, *N* is 8 with a clock rate of 800,MHz.

URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e91-c.6.871/_p

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@ARTICLE{e91-c_6_871,

author={Ning LI, Win CHAIVIPAS, Kenichi OKADA, Akira MATSUZAWA, },

journal={IEICE TRANSACTIONS on Electronics},

title={Analysis of CMOS Transconductance Amplifiers for Sampling Mixers},

year={2008},

volume={E91-C},

number={6},

pages={871-878},

abstract={In this paper the transfer function of a system with windowed current integration is discussed. This kind of integration is usually used in a sampling mixer and the current is generated by a transconductance amplifier (TA). The parasitic capacitance (*C*_{p}) and the output resistance of the TA (*R*_{o,TA}) before the sampling mixer heavily affect the performance. Calculations based on a model including the parasitic capacitance and the output resistance of the TA is carried out. Calculation results show that due to the parasitic capacitance, a notch at the sampling frequency appears, which is very harmful because it causes the gain near the sampling frequency to decrease greatly. The output resistance of the TA makes the depth of the notches shallow and decreases the gain near the sampling frequency. To suppress the effect of *C*_{p} and *R*_{o,TA}, an operational amplifier is introduced in parallel with the sampling capacitance (*C*_{s}). Simulation results show that there is a 17 dB gain increase while *C*_{s} is 1,pF, *g*_{m} is 9,mS, *N* is 8 with a clock rate of 800,MHz.},

keywords={},

doi={10.1093/ietele/e91-c.6.871},

ISSN={1745-1353},

month={June},}

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TY - JOUR

TI - Analysis of CMOS Transconductance Amplifiers for Sampling Mixers

T2 - IEICE TRANSACTIONS on Electronics

SP - 871

EP - 878

AU - Ning LI

AU - Win CHAIVIPAS

AU - Kenichi OKADA

AU - Akira MATSUZAWA

PY - 2008

DO - 10.1093/ietele/e91-c.6.871

JO - IEICE TRANSACTIONS on Electronics

SN - 1745-1353

VL - E91-C

IS - 6

JA - IEICE TRANSACTIONS on Electronics

Y1 - June 2008

AB - In this paper the transfer function of a system with windowed current integration is discussed. This kind of integration is usually used in a sampling mixer and the current is generated by a transconductance amplifier (TA). The parasitic capacitance (*C*_{p}) and the output resistance of the TA (*R*_{o,TA}) before the sampling mixer heavily affect the performance. Calculations based on a model including the parasitic capacitance and the output resistance of the TA is carried out. Calculation results show that due to the parasitic capacitance, a notch at the sampling frequency appears, which is very harmful because it causes the gain near the sampling frequency to decrease greatly. The output resistance of the TA makes the depth of the notches shallow and decreases the gain near the sampling frequency. To suppress the effect of *C*_{p} and *R*_{o,TA}, an operational amplifier is introduced in parallel with the sampling capacitance (*C*_{s}). Simulation results show that there is a 17 dB gain increase while *C*_{s} is 1,pF, *g*_{m} is 9,mS, *N* is 8 with a clock rate of 800,MHz.

ER -