While AT&T was taking one of the biggest write-offs ever, the entire analog phone system was not actually being scrapped.Ī local start-up got into the game with racks stuffed with PCBs. Bay Area was already leaning away from agriculture and towards technology when the revolution started.
Geometric growth of the cities finally became more than the POTS could handle. Build a metropolis, and the wires go everywhere. Build a sub-division and bury a bundle of twisted pairs. One twisted pair of wires could accommodate 24 individual phone calls. The so-called T1 or Plain Old Telephone System (POTS) was good enough. Image credit: Vanalog Files - the sky is darkened by the wiring. Bell's invention, a network of switches and wires was built across the land. We're talking about one of the most significant turning points in telecom history. We're not talking about printers and FAX machines. Suddenly, MaBell, PacBell and all of the others needed new office equipment. Government broke the American Telephone and Telegraph (AT&T) company into a collection of "Baby Bells". I first became aware of this trend when the U.S. That technology has become an evolutionary cul-de-sac as digital protocols have taken the traffic to levels that are unreachable with analog equipment. Standard, live radio and television broadcasts are done with an end-to-end analog chain. In between the creation and consumption of all of this data, the information is converted to digital representations of itself for storage and transmission. This can be hard to spot, but if you have to branch your RF trace, always do it in a way that does not add stubs to the active branch of the feed line microstrip.The analog world in which we live is constantly being captured in one way or another, and the media is being shared globally. If you are forced to use large components, you might need to clear the ground plane from under the excess pad area to reduce prasitic capacitance (at least for inductors). If the matching network component pads are larger in width than the RF feed line itself, the pads acts as stubs or capacitors and can affect the feed line characteristics.
Never cut the ground plane under a feed line.This ensures that the RF signals will return back to the chip via a low impedance ground path. You need a solid ground plane underneath the feed line extending all the way to the RF chip’s ground pad. Solid ground plane underneath feed line.Avoiding bends is always preferable where possible. Use a curved trace to bend the trace is needed. The feed line should not have sharp bends or stubs on it.If the SoC or RF PA output is not 50 ohms, you must use an RLC network as necessary to convert it to 50 ohms before using a long feed line. The feed line must be designed with these common guidelines in mind: If the transmitter is a high power device radiating more than 500mW, poor feed line design or 90 degree bends can cause permanent damage to the RF SoC. If your feed trace is not 50 ohms and contains obstructions, it can detune the antenna, cause massive loss of RF signal strength both ways and ultmately reduce the range of the device drastically. A bad feed line design not only affects transmission efficiency – it affects the receiver range too.
How would it not be? The trace is responsible for carrying transmitted and received signals. The antenna feed line is extremely important.
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