oscillator f limits ?

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

  1. ariemeir

    Thread Starter Member

    Jun 24, 2011
    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

    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,
  2. MrChips


    Oct 2, 2009
    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
    MrChips, thanks for the reply,

    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 ?

  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
    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.