Op-Amp Half-wave Rectifier

Absolutely, current capacity is another issue, but he just asked for one advantage, so I assumed he already knew all the rest.

Regards

It also has the additional advantage of a high input impedance.

but isn't it space consuming as it requires additional buffers(unity gain Op-amps) in input and output?

you can control the offset voltage of the half wave out but .

When the waveform u r using is a signal in a circuit, the opamp based circuit may be preferred if the design demands. The detector in a am radio was a simple diode and worked there for many years detecting the signal .

If u r rectifying the supply to be used for a circuit, u have to use a diode only.

Gajanan Phadte

What is the definition of the D.C offset voltage .when you want to generate a signal or in a rectified signal?

What is dc offset voltage...

dc offset voltage is an unwanted phenomenon if op amps r considered. In ideal condition, when both the inputs of an opamp are fed with the same voltage, the output should be zero volts.

Google opamp specifications.

Gajanan Phadte

Not precisely correct. When one considers the DC offset voltage of an op amp it is neither a wanted or unwanted phenomena. It is just a parameter of the selected op amp with a nominal value and a worst case tolerance range. You do define most of the test circuit to measure the DC input offset voltage of an op amp correctly. (The input impedances must also minimize offset bias currents.) However, depending on how the whole op amp circuit is configured this can make no difference in the output when compensated. Most of the time the magnitude of the input DC input offset voltage is so small that discerning this from 1/f noise (sometimes called flicker noise) and the thermal noise of resistors gets very difficult.

It would have been better to show the 0.7 volts break at the zero line. After all, it never puts out anything below 0.7 volts.

Gajanan Phadte

ohk....so now it all comes to the application where it is used.....Thanks a Lot Everyone...And Thanks to u G.K for Detailed explaination...helped me a lot!!!