Interactive Doppler Spectrum Simulator Doppler Spectrum Simulator Velocity (v): 0 m/s Speed of Wave (c): Carrier Frequency ($f_c$): Reset to Default Source Stationary

Instructions for Phase Modulation (PM) Step 1: Click on 'Generate Message' button to generate input message signal Step 2: Then click on 'Generate Carrier' button to generate carrier signal. The carrier frequency has to be more than the message frequency and You can change frequencies using sliders Step 3: Click on 'Generate Phase Modulated Signal' button to generate Phase Modulated Signal Step 4: Click on the 'Show Frequency Spectrums of PM' button to see spectrums of the PM signal Here, β represents the phase modulation index, given by β=kp*Am​, where Am​ is the amplitude of the message signal (assumed to be fixed), and kp​ is the phase sensitivity of the modulator 5 Hz Step 1: Generate Message 50 Hz ...

Phase Modulation (PM) See Mathmatical Background Message Frequency (Hz): Carrier Frequency (Hz): Kp (phase sensitivity): Perform PM Demodulation s PM (t) = A c cos(ω c t + k p m(t)) where, ω c = 2πf c k p = Phase sensitivity (rad/volt) Modulation Index (β) = k p A m

    UGC-NET Electronic Science Question Paper With Answer Key Download Pdf [Feb 2023] Download Question Paper               See Answers   2025 | 2024 | 2023 | 2022 | 2021 | 2020 UGC-NET Electronic Science  Feb 2023 Answers with Explanations 1. (B): A photodiode operates by absorbing photons and converting them to a current across the device. When it is reverse-biased and kept in the dark, it doesn't receive any photons. Hence, there is no photo-generated current. However, due to thermal energy, a tiny amount of current called the reverse saturation current (or dark current) flows. This is the minimum current flowing through the device when no photons are absorbed. It's essential to keep in mind that the reverse saturation current is a very small value, and it is the baseline current for a reverse-biased photodiode in the dark. 2. (C) ...