Performance Analysis of Various Nonlinear Elements in Frequency Multiplying Circuits for Wireless Applications

This paper presents the performance comparison of various nonlinear elements in frequency multiplying circuits for low power wireless applications. An analysis and design are derived. Passive frequency multipliers take advantage of the nonlinear behavior of passive circuit components. Passive frequency multipliers take advantage of the nonlinearity of passive circuit components. In this category, Schottky diodes and varactor diodes are used for frequency multiplication. We analyzed passive devices like resistive diodes (Schottky-barrier diodes) and nonlinear capacitors (varactors). The performance between frequency doubling System using Schottky diode and frequency doubling System using varactor diode is compared. Performance was evaluated in terms of output Voltage (mV), output frequency (MHz) and Output power (dBm). Frequency doubling System using Schottky diode is fast switching and more output voltage and power provides to the load side as compare to frequency doubling System using varactor diode. Input power -4.66 dBm given to frequency doubler using Schottky diode as well as varactor diode system. Output power -13.932 dBm for frequency doubling System using Schottky diode and -28.545 dBm for frequency doubling System using varactor diode is observed. We can use passive frequency doubler using Schottky diode for low power sensing application in wireless communication.