A similar circuit is commonly used to remove the long tail in gaseous detectors for high energy particles. It's called a shaper there, or tail cancellation amplifier.
There's a description of such a circuit in here , http://dx.doi.org/10.1016/j.nima.2006.02.168
and the concept is explained here **broken link removed**
a chip implementing this appears here, **broken link removed**
look for the shaper section.
Could you explain how to get this transfer function?
Added after 5 minutes:
n1cm0c said:
A similar circuit is commonly used to remove the long tail in gaseous detectors for high energy particles. It's called a shaper there, or tail cancellation amplifier.
There's a description of such a circuit in here , http://dx.doi.org/10.1016/j.nima.2006.02.168
and the concept is explained here **broken link removed**
a chip implementing this appears here, **broken link removed**
look for the shaper section.
I can not access the first URL.
This circuit is used to compensate high frequency loss.
Now I want to know is that what's the operation principle, how to analysis, and what's the type(name) of this circuit?
We can assume that gm>>1/(2*R), so that at low freq (where Cap is negligible) the effective transcondactance of the DiffAmp is Gm=1/R. At high freq the Cap shunts the R, and effective transcondactance is Gm=1/(gm+gm).
We can assume that gm>>1/(2*R), so that at low freq (where Cap is negligible) the effective transcondactance of the DiffAmp is Gm=1/R. At high freq the Cap shunts the R, and effective transcondactance is Gm=1/(gm+gm).
This circuit also has the advantage of degenration without an IR drop and having more headroom. The disadvantage is that it has higher noise due to current sources noises which are not common so the noise is uncorrelated at the Gm's output. The circuit is used to have broadband amplification where at high frequency the capacitive load dominates the output impedance and so the Gm will get higher to have the same gain.
This circuit also has the advantage of degenration without an IR drop and having more headroom. The disadvantage is that it has higher noise due to current sources noises which are not common so the noise is uncorrelated at the Gm's output. The circuit is used to have broadband amplification where at high frequency the capacitive load dominates the output impedance and so the Gm will get higher to have the same gain.