RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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and text used on the RF Cafe website are hereby acknowledged.
Envelope Tracking Video Tutorial by Radio-Electronics
Ian Poole, of the Radio-Electronics website, has produced an excellent video
tutorial on the subject of envelope tracking
usage in modern radios (aka cellphones). A combination of clear diagrams, interviews with design engineers, and live screen shots of signal
behavior is used to effectively illustrate the principles without going into gory mathematical detail. If you have ever wondered why cellphone
power amplifier (PA) companies like Qorvo (RFMD), Skyworks, and Peregrine also make and sell DC-DC converter and DC power management ICs, this
video will answer the question.
Posted November , 2015
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