# oscillator f limits ?

Discussion in 'General Electronics Chat' started by ariemeir, Jul 28, 2013.

1. ### ariemeir Thread Starter Member

Jun 24, 2011
68
1
Hi guys ,

There has been a question that had troubled me for quite some time now,
and I was hoping to raise it here in order to stimulate discussion and hopefully
learn something along the process:

Most of us have heard about the electromagnetic spectrum:

When it comes to electronic circuits, typically we work in either radio or microwave frequency which falls into a frequency range of roughly
DC-10GHZ...

My question arose from trying to understand what would happen if i try to build an oscillator that would oscillate at say 1 THz.

Now i am aware that whatever system i might use for generating such a signal, i will have parasitic capacitances, and in such a high frequency, i will probably leak all of my signal to ground through them , right ?

But my question is, say for the sake of discussion that somehow i was able to minimize the capacitance, shouldn't i be verging generating X-Rays then ?

Then again, if i am talking about 1Thz, my wavelength is somewhere between 1mm and 0.1mm which means that my capacitor and inductor need to be smaller than that (say for simplicity i am talking about a simple resonant LC tank for oscillation source).

What am i missing fundamentally here ? What is the limitation for going higher in frequency ?

Thanks for any thoughts,
Lenny

2. ### MrChips Moderator

Oct 2, 2009
12,648
3,459
Not quite X-rays.

1THz is 1x10^12Hz which is between microwaves and infrared.
Red in the visible spectrum is about 400 THz.

X-rays are above 10,000THz.

3. ### ariemeir Thread Starter Member

Jun 24, 2011
68
1

So would it be correct to assume that if i managed to overcome the parasitic L & C, i could see heat generated from my IR emitting oscillator ?

thanks,
L.

4. ### Ron H AAC Fanatic!

Apr 14, 2005
7,050
657
A laser is an oscillator, but the frequencies are above the THz range.
From Wikipedia:
See the Wikipedia article on terahertz radiation. Note that there are several types of oscillators mentioned.