Abstract
This paper is assigned to the design of voltage feedback current amplifiers (VFCAs). Their operation and interesting characteristics are covered and a novel CMOS VFCA is presented. New ideas based on super transistors (STs) are devised and used to design a high performance VFCA. Benefiting from the interesting properties of STs, the proposed VFCA exhibits high linearity, high output impedance, very low input impedance and wide bandwidth. The proposed circuit is designed using TSMC 0.18μm CMOS technology parameters and supply voltage of ±0.75V. Simulation results with HSPICE show low THD of −60dB at the output signal, very low impedance of 0.6Ω and 0.2Ω at the input and feedback ports respectively and high output impedance of 10MΩ. Moreover it can provide wide −3dB bandwidth of 15.5MHz. The results prove the high capability of the VFCA in current mode signal processing and encourage strong motivation to develop commercially available VFCAs.
Published Version
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