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what is this cross coupled COMMON DRAIN for? Fig attached.

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peterki

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What is M3x and M4x for exactly? It seems to be able to increase the bandwidth. But how?

Normally cross coupling is used in common source. why in this topology?

Thanks a million times for your answer!!

Picture1.jpg
 

Anyone knows? Thanks a lot.

One thing I know is that it indeed increased the gain bandwidth product.
 

Yes, M3x and M4x works as source follower, cross coupled.

In the simulation, the gain bandwidth product increased with this. But how?
 

Indeed, I guess it is so.
 

In the absence of M3x/4x, the circuit would have to be re-configured (to get the signal at the drain of M1/2 to appear as the outputs) but would give the output impedance as the drain/source impedance of M1/2 and the gain as the Gm
(M1/2) X the impedance of M3/4 in parallel and M1/2. With M3x/4x in circuit the output impedance becomes 1/Gm of M3x/4x and the gain Gm (M1/2) X impedance of M3/4.
Frank
 

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