A Very High Output Impedance Tail Current Source for Low Voltage Applications(Special Section on Analog Circuit Techniques and Related Topics)
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概要
- 論文の詳細を見る
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 1.28GΩ at low frequencies.Applying the proposed circuit to a differential amplifier, the CMRR is enhanced by 66.7dB, 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 0.4V, whereas that of the proposed current source approximates 0.1V.Thus, the dynamic range can be enlarged by 0.3V 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.
- 社団法人電子情報通信学会の論文
- 2000-02-25
著者
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Hyogo A
Tokyo Univ. Sci. Noda‐shi Jpn
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Hyogo Akira
Department Of Electrical Engineering Faculty Of Science And Technology Science University Of Tokyo
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Hyogo Akira
The Faculty Of Science And Technology Science University Of Tokyo
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Sekine K
Tokyo Univ. Sci. Noda‐shi Jpn
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Sekine Keitaro
Department Of Electrical Engineering Faculty Of Science And Technology Science University Of Tokyo
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Sekine Keitaro
The Faculty Of Science And Technology Science University Of Tokyo
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Ibaragi Eitake
The Department Of Electrical Engineering Science University Of Tokyo
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HYOGO Akira
the Department of Electrical Engineering, Science University of Tokyo
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SEKINE Keitaro
the Department of Electrical Engineering, Science University of Tokyo
関連論文
- FOREWORD
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- LV/LP CMOS Square-Law Composite Transistors for Analog VLSI Applications
- A Single-Ended-Input Fully-Balanced-Output CMOS Circuit
- A Current-to-Frequency Converter for Switched-Current Circuits (Srecial Section on Analong Circuit Tectningues in the Digital-oriented Era)
- A Current-to-Frequency Converter Using Switched-Current Circuits
- A Phase Compensation Technique without Capacitors for the CMOS Circuit with a Very Low Impedance Terminal(Special Section on Analog Circuit Techniques and Related Topics)
- A Very High Output Impedance Tail Current Source for Low Voltage Applications(Special Section on Analog Circuit Techniques and Related Topics)
- A Novel CMOS Analog Square Circuit Free from Mobility Reduction and Body Effect
- A CMOS Analog Multiplier Free from Mobility Reduction and Body Effect (Special Section on Analog Circuit Techniques and Related Topics)
- A Design Technique of the CMOS Circuit with a Very Low Impedance Terminal for Stability
- A Low Power Dissipation Technique for a Low Voltage OTA (Srecial Section on Analong Circuit Tectningues in the Digital-oriented Era)
- Low Power Dissipation Technique for OTA
- A Method to Improve CMRR for CMOS Operational Amplifier by Using Feedforward Technique (Special Section on Analog Circuit Techniques for System-on-Chip Integration)
- A Design for Low-Voltage Switched-Opamp with ON-Phase High Open-Loop Gain and OFF-Phase High-Output Impedance(Analog Circuit and Device Technologies)