charge pump design in hspice

[ameya_123]

I am trying to design dickson charge pump in hspice ...but im not getting proper results ....here is the hspice code that im using .....plz tell me what is wrong in it ..... ******** TITLE :3 stage cp *************

C1 2 6 220n
C2 3 7 220n
C3 4 6 220n
C4 5 0 10u
M1 1 1 2 0 nmos L=130n W=130n
M2 2 2 3 0 nmos L=130n W=130n
M3 3 3 4 0 nmos L=130n W=130n
M4 4 4 5 0 nmos L=130n W=130n
V1 1 0 5V
V2 6 0 PULSE(5 0 0 1n 1n 0.5u 1u)
V3 7 0 PULSE(0 5 0 1n 1n 0.5u 1u)
.TRAN 0u 5u
.PLOT V(2) V(3) V(4) V(5) V(6) V(7) v(1,2) v(2,3) v(3,4) v(4,5)
.PLOT i1(M1) i2(M2) i3(M3) i4(M4)
.PRINT V(2) V(3) V(4) V(5) V(6) V(7)
.END

 

[frankliner]

The problem is the capacitor sizes (In reality the voltages. 130nm devices will not survive 5V). If you change c1-c4 to 0.2pf it might show you what you expect.

 

[leo_o2]

MOSFET size is too small. Its on-resistance will be too big.