This paper proposes a new current-mode digital modulation circuit. The proposed circuit is MOS only hence, easily integrable. It employs an Extra X Current Conveyor (EX-CCII), two MOS transistors as switches, and a two MOS transistor-based active resistor. The amplitude shift keying/phase shift keying/frequency shift keying (ASK/PSK/FSK) modulator is obtained by proper selection of carriers (I_C1, I_C2). This circuit provides the current output signal at high output impedance, which is favorable for cascading. Also, the circuit is employing only MOS transistors, so it can be monolithically IC implementable. The effects of non-idealities and parasitics of the active element on the circuit performance are also investigated in detail. The functionality of the proposed digital modulator is verified through the Cadence Virtuoso tool using 0.18 μm Generic Process Design Kits parameters with the ±0.9 V supply voltage. The total area of the layout is 968.75 μm². Also, the experimental results are verified by using the IC AD-844 and IC CD4007.

本文提出了一种新的电流模式数字调制电路。所提出的电路仅是MOS，因此易于集成。它采用一个额外的X电流传送器（EX-CCII），两个MOS晶体管作为开关，以及两个基于MOS晶体管的有源电阻器。该幅移键控/相移键控/频移键控（ASK / PSK / FSK）调制器通过载体（I的适当选择而获得_C1，我_C2）。该电路以高输出阻抗提供电流输出信号，有利于级联。而且，该电路仅采用MOS晶体管，因此可以单片IC实现。还详细研究了有源元件的非理想性和寄生性对电路性能的影响。通过Cadence Virtuoso工具使用电源电压为±0.9 V的0.18μm通用工艺设计套件参数验证了所提议的数字调制器的功能。布局的总面积是968.75微米²。另外，使用IC AD-844和IC CD4007验证了实验结果。