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Gate connection hooking up at both ends of Poly gate

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Can any one explain the advantages/disadvantages of hooking up the gate connection at both the poly ends of the same gate and shorting with met 1 routing over the gate both the ends ????
If the width of transistor is small ( 5um ) ??
 

Can any one explain the advantages/disadvantages of hooking up the gate connection at both the poly ends of the same gate and shorting with met 1 routing over the gate both the ends ????
If the width of transistor is small ( 5um ) ??

Advantages are

Used to improve the speed of the gate in high frequency designs by lowering the resistance/capacitance. Although the metal one is normally looped round the device, not directly over the gate.

Disadvantages

Takes up more die area and is more complicated.
 

Thanks K_90.

There forms a loop over gate and hence sidewall capacitance increases between gate to source and gate to drain. Resistance decreases but these leads to unncessary parasitic Capacitance.


I didn't get How Die area increases ? can please explain.
 

If you had the gate connected top and bottom in a loop going around the device the metal one takes up space and limits the use of metal one for getting the source/drain connected.

ok?
 

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