m.afzal
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I am a first time analogue designer and need help with my Gilbert cell multiplier(CMOS 0.18um technology). The problem is that my circuit doesn't bias correctly.I work in low frequency. the output that I need, the plot of four quadrant of multiplier.
Code:
*Gilbert cell analog 5
.options brief
*********************Main circuit**********3
m1 n1 x1 n4 n4 n L=0.18u W=50.12u
m2 n2 n3 n4 n4 n L=0.18u W=50.12u
m3 n1 n3 n5 n5 n L=0.18u W=50.12u
m4 n2 x1 n5 n5 n L=0.18u W=50.12u
m5 n4 y1 n6 n6 n L=0.18u W=100.24u
m6 n5 y2 n6 n6 n L=0.18u W=100.24u
R1 n1 n12 500
R2 n2 n12 500
**********************load library******************13
.lib 'C:\synopsys\Hspice_A-2008.03\mm018.l' tt
*****************define stimuli ********************15
vx1 x1 0 dc=0.6v
vx2 n3 0 dc=-0.6v
vy1 y1 0 dc=0.4v
vy2 y2 0 dc=-0.4v
vdd n12 0 dc=1.8v
vss n6 0 dc=-1.8v
vx x1 n3 0.2v
vy y1 y2
*************** DC sweep statements **************27
.op
.dc vy -1v 1v 0.5v
.probe dc v(n1,n2)
.end
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