The subject pretty much sums it up. I'm in an Electronic Communications class for my major and we're discussing things revolving around amplitude and frequency modulation and demodulation, as well as single and double sideband signals. I'm interested in learning how to implement these things with analog circuits, avoiding special ICs made for it as much as possible. The class and lab deals with Fourier Transforms and all the theory and math behind it, and a few 'system' diagrams made up which describe a pipeline, but there's absolutely no discussion on implementing circuits of any kind to do the operations necessary to say, modulate and demodulate a signal. I'm specifically avoiding the subject of DSPs for this purpose because it just seems too easy to plug in the math, and analog circuits are, as far as I know, cheaper and more challenging to design. I should also mention that I'm in my first of two Electronic Circuits(essentially semiconductor circuit analysis) classes. I understand the basic concepts of how BJTs and MOSFETs work, but I'm not yet familiar with the circuit models of these devices.
That said, my goal here would be to construct some form of radio transmitter or receiver using discrete semiconductors as much as possible. I'm not actually sure where to start looking for information, though. Google searches lead me to textbooks that continue to discuss theory rather than application. Rather, I guess I'm looking for some sort of reference which shows common analog circuits used in this application, with some level of analysis on how they work. (It is my expectation that even after learning circuit models for more semiconductors, complicated circuits will not be something I can quickly dream up on my own, similar to my belief that I'd never come up with a fourier transform on my own, or invent calculus. If it is anyone's experience that these circuits are much simpler to create though, I'd like to know).
In one type of system, we use a multiplier for both modulation and demodulation, as well as filters (which are easy enough to find), and a phase locked loop. Both the PLL and multiplier are a couple of things I'd like to start with, but I'm having difficulty finding much information on a discretely built multiplier or PLL circuit. Essentially the point of all my blabbering is: where can I get started on practical analog circuit design, I'll get all the theory I need as time goes on.
Of course, feel free to tell me if I'm totally off my rocker as well with where to get started. I can take it.