By Jon B. Hagen
We use this booklet in refreshing/training all of our new engineers that might be operating with RF magnetics. The ebook is written throughout a really extensive number of subject matters and is as a result missing in penetrating aspect as others have pointed out. Therin lies the books basically genuine sin - that of attempting to hide an excessive amount of.
If, even if, your quest is to airborne dirt and dust the cobwebs or get your brain round the 'mysterious' global of RF electronics, this e-book might be very usefull. Jon's gigantic adventure exhibits via within the variety of knowledge, now not inevitably the intensity of it, that is sturdy for individuals like me that need to know a bit of every little thing that allows you to adequately body what i'm approximately to immerse myself in.
In the case of RF Electronics, i'd hugely suggest Chris Bowick's ebook "RF Circuit layout" as a better half to this booklet for these in need of extra extensive info on the design/circuit point & for these looking a few extra checking out tips to Joseph J. Carr's booklet "Practical Radio Frequency attempt & Measurement". finally, while you are both HAM or magnetics-centric, I hugely suggest Jerry Sevick's ebook "Transmission Line Trasformers". those 4 books provide you with a truly stable library & while you're doing PCB layouts, spend the money on Tim Williams "Circuit Designers Companion", it is going to pay for itself on your first format with a brand new engineer. In our event, those were the "Fabulous Five", in an effort to communicate, of RF Electronics.
This moment, up to date variation of the best-selling Radio-Frequency Electronics introduces the fundamental techniques and key circuits of radio-frequency platforms. It covers the basic rules using to all radio units, from instant single-chip info transceivers to high-power broadcast transmitters. This new version is generally revised and improved all through, together with extra chapters on radar, electronic modulation, GPS navigation, and S-parameter circuit research. New labored examples and end-of-chapter difficulties are integrated to assist and try realizing of the subjects coated, in addition to a variety of additional figures to supply a visible relief to studying. Key subject matters coated contain filters, amplifiers, oscillators, modulators, low-noise amplifiers, section lock loops, transformers, waveguides, and antennas. Assuming no earlier wisdom of radio electronics, this can be a excellent advent to the topic. it truly is a fantastic textbook for junior or senior classes in electric engineering, in addition to a useful reference for pro engineers during this region.
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Extra info for Radio-Frequency Electronics: Circuits and Applications
A special driver circuit can be used to generate an inverse exponential (logarithmic) drive signal to linearize the amplifier. This happens automatically if the base drive is a current waveform; the output current (and hence the voltage across the load) will have the same waveform shape as the base current. It is also common to use a negative feedback correction loop to force the output signal to follow the input signal. The common-emitter amplifier can supply voltage amplification as well as power amplification.
Nearly every receiver (radio, television, radar, cell phone, … ) uses the superheterodyne principle, in which the desired channel is first shifted to an intermediate frequency or “IF” band. Most of the amplification and bandpass filtering is then done in the fixed IF band, with the advantage that nothing in this major portion of the receiver needs to be retuned when a different station or channel is selected. The same principle can be used in frequency-agile transmitters; it is often easier to shift an already modulated signal than to generate it from scratch at an arbitrary frequency.
This push–pull circuit, like the transformerless push–pull circuits, can be operated class B for high efficiency. Some high-power tube-type audio and RF amplifiers use this symmetric transformer circuit. Note the use of a centertapped driver transformer – one way to supply the bases with the required opposite polarity signals. Transistor audio amplifiers are usually push–pull and transformerless. 14(a). 14(b) is equivalent and uses only a single capacitor. The transistors can be in either the totem pole arrangement (a), or in the complementary NPN/PNP arrangement (b).