How does an inverter work as an Amplifier??..its generally used in high frequency amplification.?
Answer:
oye...!askin frm ur studies s nt dun! hw do i no dat nw...k umm...invrter while cnvrtin ac into dc also serves t amplify it...r s it dc into ac?n wt da hell s hi frequency amplification!!??
An inverter, in the sense you used the term here, is simply an amplifier in which the output is of opposite polarity from the input. The fact that it is an amplifier implies that it has gain. Any amplifier will have an upper limit of frequency above which it will not function.
Inverters are pretty handy as an amplifier in certain applications. I once built a guitar distortion pedal based on this, using a cmos 4000-series hex inverter. This particular project, if I remember right, didn't even use feedback, so of course the output was highly distorted, which was the desired result. If you add some negative feedback, distortion is much lower.
Yes, this is not a DC amplifier as the input is typically capacitively coupled. Likewise the output. If you want to try one out, just input a small signal (like from a microphone) into something like both inputs to a CD4001 NAND gate (I'm calling out this one because it's one that comes to mind - I can't recall the # for a 4000-series inverter off the top of my head), via a 0.1uF cap and a 10k resistor (in series). The output will be a highly-amplified and very-distorted (though quite intelligible) version of the input, virtually a squarewave. Then add various amounts of negative feedback by connecting a resistor between the output and the input, starting with say 1Mohm. Gain will be, like an opamp, the value of the feedback resistor divided by the input resistor, 100 in this example.
I'm calling out the 4000-series cmos because, one, they are relatively low-speed with softer edges, and two, being cmos, the distortion has similiar characteristics to that of tubes, i.e, odd-harmonics are favored, giving that nice warm tube amp sound. Bipolar, like TTL, adds distortion of both even and odd harmonics, tending to make a very raspy unpleasant sort of distortion, more like a buzz.
in cmos case for it to work as amplifier both pmos and nmos must in saturation region.but that is not the case in cmos inverter since in that either pmos or nmos will be in saturation not both and we normally we want to avoid the region in which both the transistors lie in saturation that is in digital vlsi.but in analog vlsi this is the region where all amplifiers work
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