Some Words about Power Amp [hlp]

[elf61]

Hi
pls explain me about these terms

- IP3
- Spurious Signals
- Harmonics

what is the difference between Spurious signals and harmonics?
pls hlp.

 

[mshareef]

Hi,

IP means Intercept point and the number gives the order. The intercept point is a figure of merit that is a guide to the linearity of the device. More details at http://www.sm5bsz.com/dynrange/intermod.htm

Spurious signals are Undesired signals. It is an unintended and unwanted
output signal on a frequency other than the fundamental signal frequency. It can be generated by faulty modulation, amplification, and/or oscillationSpurious signals can be considered in two classes: 1) Stationary, that is, their frequency and amplitude do not change significantly, 2) Non-stationary, where the frequency and/or amplitude change significantly over short time periods.

Spurious signals are best detected in the frequency domain using spectrum analysis. Spikes in the time domain are best seen using digitizers with appropriate sampling and trigger facilities.

Harmonics of a signal are signals which are related to the original (or fundamental) by an integer (non decimal) number. A pure tone signal has no harmonics; it consists of only one single frequency.

More on amplifiers at : http://www.rocketroberts.com/techart/amp.htm

 

[elf61]

Hi mshareef
is there any relation between intermodulation and spurious signals?

 

[mshareef]

is there any relation between intermodulation and spurious signals?

i hope the FAQ at https://www.lbagroup.com/associates/intfaq.php should be enough to clarify.

 

[wicked]

harmonics are frequencey products of the signals modulating, for the most part.
spurious is the contents of noise not associated to this product.