Discussion on: A great book about RF circuit design just got better

5

Join the conversation!

View:
Show:
The implication here is that digital is RF
BALTHOR 24th Mar 2008
Digital is pulses of DC and RF is that analog sine wave stuff.My first question would be how can anybody multiplex DC on to AC.I'd have to see the wave.
Not neccessarily related...
normhaga@... Updated - 25th Mar 2008
That is kind of what you are doing with DC loading of a coil. A coil, whether an RF choke, impedance matcher, or a transformer has better characteristics and efficiency when loaded with a DC current even though it is an AC device.
Contributr
Interesting question
Michael Kassner Updated - 25th Mar 2008
When discussing RF propagation, digital usually refers to the modulation of the RF signal which is analog. There are a multitude of digital modulation techniques and all use three basic analog wave variables. Those would be amplitude, frequency, and phase. Each of these phases, frequencies or amplitudes are assigned a unique pattern of binary bits. The number of bits comprises the symbol that is represented by the particular analog wave variable.

A very simple example of digital modulation would be that of Morse code which uses continuous wave RF signal. Continuous wave is a carrier wave that is switched on and off. Information is carried in the varying duration of the on and off periods of the signal.

Did the articles prove of interest?
psk31, pactor, amtex, rtty, etc
Mule-12595447 25th Mar 2008
Digital in the RF Arena
TheChas 25th Mar 2008
First off, ALL digital signals include RF components. All of the one's can be expressed as a series of increasing frequency sine waves starting with the base frequency of the pulse. That is why it is easy for someone to spy on a computer from a distance.

Second, all of our digital communications are composed of ones and zeros modulated onto a RF carrier. The higher the baud rate, the higher the frequency of the modulation itself.

All computer hardware designers need to pay attention to the physics and realities of RF waveform propagation. Otherwise, the date word you send across the data bus gets jumbled or even mixed up on the way.

In fact, the realities of high speed data transfer is why we have serial ATA and PCI Express. It is just too difficult to send a parallel data word at higher data rates.

So, there is RF in your data, and data on your digital encoded RF communications.

Chas
Keyboard Shortcuts:
Prev
Next
Toggle
Join the conversation
Formatting +
BB Codes - Note: HTML is not supported in forums
• [b] Bold [/b]
• [i] Italic [/i]
• [u] Underline [/u]
• [s] Strikethrough [/s]
• [q] "Quote" [/q]
• [ol][*] 1. Ordered List [/ol]
• [ul][*] · Unordered List [/ul]
• [pre] Preformat [/pre]
• [quote] "Blockquote" [/quote]

Join the TechRepublic Community and join the conversation! Signing-up is free and quick, Do it now, we want to hear your opinion.