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A New Voltage(Current)-Controlled Current-Feedback Operational-Amplifier Based Mulivibrator
Muhammad Taher Abuelma’atti,Zainualbideen Jamal Khalifa 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper a simple multivibrator circuit is proposed. The circuit uses two current-feedback operational amplifier. The duty cycle of the output rectangular wave can be controlled by adjusting a control voltage. The duty cycle can also be controlled by adjusting a control current instead of the control voltage.
Prediction of Gain Expansion and Intermodulation Performance of Nonlinear Amplifiers
Muhammad Taher Abuelma'atti 한국전자통신연구원 2007 ETRI Journal Vol.29 No.1
A mathematical model for the input-output characteristic of an amplifier exhibiting gain expansion and weak and strong nonlinearities is presented. The model, basically a Fourier-series function, can yield closedform series expressions for the amplitudes of the output components resulting from multisinusoidal input signals to the amplifier. The special case of an equal-amplitude two-tone input signal is considered in detail. The results show that unless the input signal can drive the amplifier into its nonlinear region, no gain expansion or minimum intermodulation performance can be achieved. For sufficiently large input amplitudes that can drive the amplifier into its nonlinear region, gain expansion and minimum intermodulation performance can be achieved. The input amplitudes at which these phenomena are observed are strongly dependent on the amplifier characteristics.