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Circuit design techniques for very low-voltage analog functional blocks using triple-tail cells

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1 Author(s)
Kimura, K. ; Fundamental Technol. Dev. Dept., NEC Corp., Yokohama, Japan

Novel circuit design techniques for very low-voltage analog functional blocks using triple-tail cells are presented. A triple-tail cell is operable on very low voltage because it possesses a very simple circuit structure, and it operates as a gain controllable differential amplifier and a tunable rectifier. It is very suitable for analog functional blocks, such as operational transconductance amplifiers (OTA's), four-quadrant analog multipliers, logarithmic intermediate-frequency (IF) amplifiers, and automatic gain control (AGC) amplifiers, to be realized using triple-tail cells with a small circuit scale. Therefore, a triple-tail cell is the most essential circuit for very low-voltage operation in signal processing. Furthermore, very low-voltage operation at a 1 V supply voltage and the fundamental characteristics of the basic circuits consisting of triple-tail cells, such a transconductance controllable OTA, four-quadrant analog multipliers, a logarithmic IF amplifier, and an AGC amplifier, were verified with transistor-arrays and discrete components on a breadboard

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:42 ,  Issue: 11 )