1-2hit |
Soichiro OHYAMA Akira HYOGO Keitaro SEKINE
A Switched-Opamp is a device in SC circuits for replacing switches with Opamps which operate like a switch. This technique can be acheived in very low voltage operation. In this paper, we present a design for a Switched-Opamp that can operate at a low supply voltage during the ON-phase and can maintain a high output impedance during the OFF-phase.
WANG Guo-Hua Kenzo WATANABE Yutaka FUKUI
A dual transformation incorporating the frequency-dependent scaling factor with the impedance dimension is proposed to synthesize the current-mode counterpart of a voltage-mode original. A general class of current-mode active-RC biquadratic filters and a switched-capacitor low-pass biquad are derived to demonstrate the synthesis procedure. Their simulation and test results show that the current transfer functions are the same as the voltage transfer functions of the originals, and thus confirm the validity of the procedure. The dual trasformation described herein is general in that with the scaling factor chosen appropriately it can meet a wide variety of circuit transformation, and thus useful also for circuit classification and identification.