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RF Filter, Tuned Amplifier and Mixer design and simulation in PSPICE

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  Background A superheterodyne receiver is present in almost all modern radios. This type of radio receiver has different stages that convert a received signal from its original carrier frequency to an intermediate frequency(IF). This conversion process is done through a mixer. The main components can be seen in the block diagram below. Here I will be focusing on the design for the RF filter, RF Tuned amplifier and the mixer. Overview of Design In this post I will document the process of designing and simulating three components of a superheterodyne receiver. The RF filter, RF amplifier and the mixer with an oscillator. The design is to operate at a resonant frequency of 40kHz Tuned amplifier will have a gain of 35V/V and bias current Ic=15mA The intermediate frequency of the mixer is to be 9kHz I will begin with the filter design, then the RF amplifier and finally with the mixer. RF Filter Design Specifications of RF Filter The specifications of the passive filter are as follows: ...
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AC-DC Linear Power Supply & Voltage Regulation

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  Background      One of the most common sources of electrical power is an electrical outlet. This power is in the form of AC. To use it in smaller devices or to charge a phone, it must be converted to DC. Next, it must be regulated to a steady voltage that can supply a specified amount of current. This two-step process is known as rectification and voltage regulation. One of the most common and simplest design for voltage regulation is by using a linear voltage regulator. It has a drawback of always being on and losing the unused power as heat, but the design process is simple which is why it's still used even today. Specifications      In this post I will document the process of rectifying an AC voltage, regulating the output and then simulating it and testing it. The specifications for the regulated power supply are as follows: 9V @750mA Input voltage = 120Vrms AC  There are two stages of the design. First the regulated part and then the unregu...
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