A Very High Output Impedance Tail Current Source for Low Voltage Applications

Eitake IBARAGI; Akira HYOGO; Keitaro SEKINE

A Very High Output Impedance Tail Current Source for Low Voltage Applications

Eitake IBARAGI, Akira HYOGO, Keitaro SEKINE

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A tail current source is often employed for many analog building blocks. It can limit the increase of excess power. It can also improve CMRR and PSRR. In this paper, we propose a very high output impedance tail current source for low voltage applications. The proposed tail current source has almost the same output impedance as the conventional cascode type tail current source in theory. Simulation results show that the output impedance of the proposed circuit becomes 1.28 GW at low frequencies. Applying the proposed circuit to a differential amplifier, the CMRR is enhanced by 66.7 dB, compared to the conventional differential amplifier. Moreover, the proposed circuit has the other excellent merit. The output stage of the proposed tail current source can operate at V_DS(sat) and a quarter of V_DS(sat) of the simple current source in theory and simulation, respectively. For example, in the simulation, when the reference current I_REF is set to 100µA, the minimum voltage of the simple current source approximates 0.4 V, whereas that of the proposed current source approximates 0.1 V. Thus, the dynamic range can be enlarged by 0.3 V in this case. The value is still enough large value for low voltage applications. Hence, the proposed tail current source is suitable for low voltage applications.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E83-A No.2 pp.204-209

Publication Date: 2000/02/25

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Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)

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Eitake IBARAGI, Akira HYOGO, Keitaro SEKINE, "A Very High Output Impedance Tail Current Source for Low Voltage Applications" in IEICE TRANSACTIONS on Fundamentals, vol. E83-A, no. 2, pp. 204-209, February 2000, doi: .
Abstract: A tail current source is often employed for many analog building blocks. It can limit the increase of excess power. It can also improve CMRR and PSRR. In this paper, we propose a very high output impedance tail current source for low voltage applications. The proposed tail current source has almost the same output impedance as the conventional cascode type tail current source in theory. Simulation results show that the output impedance of the proposed circuit becomes 1.28 GW at low frequencies. Applying the proposed circuit to a differential amplifier, the CMRR is enhanced by 66.7 dB, compared to the conventional differential amplifier. Moreover, the proposed circuit has the other excellent merit. The output stage of the proposed tail current source can operate at V_DS(sat) and a quarter of V_DS(sat) of the simple current source in theory and simulation, respectively. For example, in the simulation, when the reference current I_REF is set to 100µA, the minimum voltage of the simple current source approximates 0.4 V, whereas that of the proposed current source approximates 0.1 V. Thus, the dynamic range can be enlarged by 0.3 V in this case. The value is still enough large value for low voltage applications. Hence, the proposed tail current source is suitable for low voltage applications.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e83-a_2_204/_p

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@ARTICLE{e83-a_2_204,
author={Eitake IBARAGI, Akira HYOGO, Keitaro SEKINE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Very High Output Impedance Tail Current Source for Low Voltage Applications},
year={2000},
volume={E83-A},
number={2},
pages={204-209},
abstract={A tail current source is often employed for many analog building blocks. It can limit the increase of excess power. It can also improve CMRR and PSRR. In this paper, we propose a very high output impedance tail current source for low voltage applications. The proposed tail current source has almost the same output impedance as the conventional cascode type tail current source in theory. Simulation results show that the output impedance of the proposed circuit becomes 1.28 GW at low frequencies. Applying the proposed circuit to a differential amplifier, the CMRR is enhanced by 66.7 dB, compared to the conventional differential amplifier. Moreover, the proposed circuit has the other excellent merit. The output stage of the proposed tail current source can operate at V_DS(sat) and a quarter of V_DS(sat) of the simple current source in theory and simulation, respectively. For example, in the simulation, when the reference current I_REF is set to 100µA, the minimum voltage of the simple current source approximates 0.4 V, whereas that of the proposed current source approximates 0.1 V. Thus, the dynamic range can be enlarged by 0.3 V in this case. The value is still enough large value for low voltage applications. Hence, the proposed tail current source is suitable for low voltage applications.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - A Very High Output Impedance Tail Current Source for Low Voltage Applications
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 204
EP - 209
AU - Eitake IBARAGI
AU - Akira HYOGO
AU - Keitaro SEKINE
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E83-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 2000
AB - A tail current source is often employed for many analog building blocks. It can limit the increase of excess power. It can also improve CMRR and PSRR. In this paper, we propose a very high output impedance tail current source for low voltage applications. The proposed tail current source has almost the same output impedance as the conventional cascode type tail current source in theory. Simulation results show that the output impedance of the proposed circuit becomes 1.28 GW at low frequencies. Applying the proposed circuit to a differential amplifier, the CMRR is enhanced by 66.7 dB, compared to the conventional differential amplifier. Moreover, the proposed circuit has the other excellent merit. The output stage of the proposed tail current source can operate at V_DS(sat) and a quarter of V_DS(sat) of the simple current source in theory and simulation, respectively. For example, in the simulation, when the reference current I_REF is set to 100µA, the minimum voltage of the simple current source approximates 0.4 V, whereas that of the proposed current source approximates 0.1 V. Thus, the dynamic range can be enlarged by 0.3 V in this case. The value is still enough large value for low voltage applications. Hence, the proposed tail current source is suitable for low voltage applications.
ER -