Improvement Current-Mode Four-Quadrant Multiplier Low input Impedance and Very High Output Impedance
Keywords:Current-Mode Multiplier, Four-Quadrant Multiplier, Low Input Impedance, Very High Output Impedance, Super-Cascade MOS Transistor
The analog current-mode multiplier is used in the modulator, frequency double, variable gain amplifier, and peak detector since the characteristic of the current mode integrated circuit is high bandwidth. In addition, the current mode multiplier must have a low input impedance and the high output impedance. The previous studies are not designed so that circuit has input and output impedance following to characteristics of the current mode multiplier. This paper presents the improvement of the current mode four-quadrant multiplier. The proposed circuit is designed based on the cascade current squarer circuits. The current mode four-quadrant multiplier is designed that input impedance is low value with negative feedback. In this technique, the circuit receives the proper input current. Furthermore, the current multiplier is designed to have high output impedance with a super-cascode MOS transistor. As a result, the output stage pushes the current to the next stage correctly. Therefore, the current mode four-quadrant multiplier circuit is designed using 0.18 µm TSMC CMOS technology. The supply voltage of the proposed circuit is 1.5 V which is lower than previous research. This research is designed in order to that the MOS transistors are operated in the saturation region. The simulation results show that input impedance is equal to 106.93 W (f 1 MHz), thus ultra-lower than other research papers. The simulation results show that output impedance is equal to 4.45 GW (f 1 kHz) which is higher than previous studies. Also, the output stage can push the source current to the next state effectively.
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