Radio receivers are usually tuned by adjusting the capacitor of an LC circuit. If C = C1 for a frequency of 600 kHz, then for a frequency of 1200 kHz one must adjust C to: C1/2 C1/4 2C1 4C1 √2C1
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![The message signal for a phase modulation (PM) is given in Figure 1. a as shown. The carrier signal has an amplitude of Ac = 1 Volt and a frequency of fc = 100 kHz, with a frequency deviation of Δf = [15] kHz. Since the resulting PM signal is demodulated as shown in Figure 1. b, please draw the signals formed at points c, d, e, and f. (The YGF in the figure only suppresses the DC component. Please indicate the amplitude and frequency information in the figures you draw. ) Figure 1. a Figure 1. b](https://www.doubtrix.com/uploads/editor/9497080453IrgOuAswRC.png)
![Figure P5-1 shows a common source single transistor MOSFET amplifier utilizing an N-Channel Enhancement Mode MOSFET. The term "common source" refers to the source terminal being shared by both the input circuit and the output circuit. The parameters for the MOSFET and the supply voltage are also given. Hand Analysis P1. In terms of DC bias, determine a value for VGS to set the drain current ID to 5 mA. Also determine a value for RD to set the VDS bias to 6 V. P2. In terms of small-signal parameters, determine the transconductance gm of this amplifier as well as the voltage gain, Av. P3. If vgs is a 0.1 Vpk sinewave at a frequency of 1 kHz [ie. vgs = 0.1sin(2pift)V ] determine an expression for the output voltage vOUT as a function of time. Sketch vIN and vOUT for two complete cycles, including the DC bias for each signal. Simulation P4. Simulate the circuit of Figure P5-1 to verify your hand analysis and create a plot similar to P3 as part of your prelab. Use the virtual MOSFET model in simulation with SPICE parameters VT0 = 1.8 V and KP = 120 mA/V2. (The default values of 100um for W and L will be fine since their ratio equals unity.)](https://www.doubtrix.com/js/ckeditor/filemanager/connectors/php/editor/1695874154-Avjhgifoih.png)