Howto get the average voltage of a signal?

[jins]

How i will get the average voltage of a signal, its frequency is varying from 8K to 4Mhz?

 

[abbeyromy]

averaging circuit

hmmm interesting
so if the signal frequency is not fixed then it makes it a non periodic signal right?

So you talking about average value of a non periodic signal?

What is your application exactly.. please share

 

[karesz]

averaging circuit

Hi,
Because the F-range is factor 500, is a simple integration not practicable...
I can think only on some peakdetecting/sample & hold, what is per (a free running oscillator)1KHz to zeroing?
Or if signal amplitude is enough high, you can count the pulses and after i.e. 10 reset the peak detector/S&H
K.

Added after 8 minutes:

Maybe a wideband (active) rectifier + SW-median filtering is the good solution?

 

[jins]

Re: averaging circuit

This is for a TWT Helix current measurement, the PRF is varying from 8K - 4MHZ..

 

[karesz]

averaging circuit

I would say; LTC5505 & Schottky, BAT47/48 = I think they would work enough good at 4MHz too...
K.

Added after 1 hours 59 minutes:

I think found two good Ideas
High-speed rectifier uses no diodes_20MHz, 0.6Vpp: www.edn.com/ednmag/archives/1995/033095/07di6.htm
Fast rectifier circumvents input-level effects_10MHz,1Vpp: www.edn.com/ednmag/archives/1994/122294/26di5.htm
K.