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zero vth transistor design problem

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in umc 0.18um process, there is zero vth transistor(only NMOS).

1, Can PMOS zero vth transistor exist? why?
2, what is the normal use of zero vth transistor?
3, i build a current mirror with the zero vth NMOS transistor, but i have found that, the mirror ratio is wrong, i design it to be 1:10, but the simulation shows that it is 1:300, very large, why? vds modulation? or any other reason?

thanks.
 

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