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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

- Publicized

- Online ISSN

- DOI

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

- Category

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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 -