amplifieranalogoperational-amplifierpower supplyvoltage
As title says, what limits increase of power supply voltage of operational amplifiers? Is there any significant drawback related to increase of power supply voltage other than pure energy consumption problem?
So like any slowdown of the amplifier process, size of op-amp or power supply has to be bigger, or those kinds of issues. Is there any of them happening due to power supply voltage of op-amp increasing? Anything related to transistors?
The term "negative gain" is reserved for those cases where the line has a downward slope and so reverses the polarity of the signal (a 180° phase change). A op-amp in an inverting configuration is a prime example.
What you have is an attenuating amplifier; the signal out has a somewhat decreased amplitude from the signal coming in but not a different sign. (I'm ignoring the offset of the sloped line in order to keep it simple)
The relation of the voltage-over-voltage gain (V/V) to dB gain often confuses people since the dB measurement actually strips out the "inverting" property of negative-gain amplifiers (since you take the log of the absolute value of the gain). Let's set up fours scenarios for different line slopes (V/V gain):
Scenarios 1 and 2 have a positive slope/gain and thereby a 0° phase difference while scenarios 3 and 4 have negative gain (signal inverting) and thereby a 180° phase difference. Scenarios 2 and 3 have a gain who's absolute value is less than one and thereby are attenuating amplifiers, expressed by a negative dB gain, while scenarios 1 and 4 are "amplifying amplifiers".
The Wikipedia page on Gain might explain it better then I can.
The purpose of an amplifier isn't always to increase the voltage amplitude of a signal being passed through. It might for example be used to drive a current-hungry device when the source signal/device can't, like loudspeaker power amplifiers do.
But the supply specs I use says it is cc not cl. Could you expound on it if you have any idea?
Look at the front page of your manual: -
Now look at the other link you provided: -
Best Answer
There are reasonably priced op amps that allow 90V between the supplies (example). There are also ridiculously expensive power op amps that can handle hundreds of volts (example). But lower voltage op amps are more common.
One reason for this is that op amps generally use the same supply voltages as the rest of the system. It's best to keep the system supply voltages as low as possible for a variety of reasons, including cost, power consumption, performance, and safety (60V DC is sometimes given as a maximum safe voltage level). In recent years, there's been a lot of demand for op amps that can run off of low-voltage digital supplies.
Even if a high supply voltage is available, the op amp will still have higher power consumption (that first example has a power pad). The bandwidth and slew rate on the high-voltage models don't seem to be anything to write home about.
The main reason, I think, is that op amps are used for signal processing, and signals do not need to be high-voltage to carry information. What does +/-45V get you that +/-15V doesn't? In audio, that's not even ten decibels. If you happen to have a high-voltage signal, you can easily reduce the voltage with a couple resistors. If you need a high-power output, you can use discrete transistors with lower-voltage op amps providing feedback control. There's just no need to carry around a 100V signal in most systems. The cost and development effort are better spent on improving other parameters.