SPICE doesn't use the SINE large signal in small signal - it uses the fact that with circuit analysis of a linear circuit, you can use Laplace forms for equivalent impedances so that: V = IR and V = I sL and V = I / sC. This means the small signal AC is just the same as a resistor linear...
Side bands can be understood from high school trig identities:
When you modulate, you are using a multiplication operation implemented in analog circuitry. All "mixers" are essentially multipliers. That's why the symbol for a mixer is a circle with an inscribed "X".
So say this involves a...
Honestly I wouldn't bother combining EM + Thermal for an air coil. Why? Because the conductive heat transfer of air of so starkly poor.
Also "what frequency DC?" - 1 Hz could be sufficient to be DC; it's "on a spectrum" anyway. For microwave equipment, 50 MHz is "sufficiently DC"! Do a...
Rule of Thumb: a parabolic dish diameter should be 10x the longest wavelength. If you don't have that, you are better off using a different type of antenna.
No. That's not what happens.
READ the USB-3/USB-C charger standard! There is a negotiation to define who is the power source vs. power load, how much voltage and current can be supplied, etc. This is how these interfaces are able to charge devices faster than before. Either side can be the...
Log10(x^N) = N * Log10(x)
High school log identity.
P = V^2 / R
If you standardize the resistance/impedance, the R falls away and it's P ~ V^2 vs. V which with log10 gives a factor of 2.
There's no reason why it should have equipment problems either from being left on 24x7 or having power cycled. Test equipment is designed for this. However there are contributors specific to relay testing and test equipment that themselves use internal relays:
Relay coils can create large...
The very same reason that iPhones replaced push-button mobile phones: the design and support results in more programmable, more useable, more updatable and overall cheaper to make things when using touch-screens replacing buttons. Literally controls become software instead of hardware which...