alvays
Member level 4
spectre pz analysis
INDEX: pz analysis; hspice; spectre; pole and zero
I just do the pz analysis with spectre(analog simulation environment) and hspice on the same circuit: a two stage op amp with differential input and single output
Their bode plot same as each other, but the report are different:
Hspice's report is correspondance with the bode
But spectre's report is wrong, also I can only get 2 poles and 2 zeros( How can I set the options?).
Anybody comes to this before? Or I have set the options of pz in spectre wrong?
HSPICE:
poles (rad/sec) poles ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-5.0734k 0. -807.4560 0.
-23.2417x 0. -3.6990x 0.
-139.6991x 0. -22.2338x 0.
-533.9424x 0. -84.9796x 0.
-935.9903x 0. -148.9675x 0.
-1.4271g 0. -227.1237x 0.
zeros (rad/sec) zeros ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-137.5430x 0. -21.8906x 0.
-762.5724x 0. -121.3672x 0.
-1.2621g 0. -200.8615x 0.
-1.4666g 0. -233.4214x 0.
2.0379g 0. 324.3371x 0.
2.8481g 0. 453.2941x 0.
SPECTRE
freq=100
Poles(Hz)
Real Imaginary Qfactor
Pole_1 -1.01495e-05 0.00000e+00 5.00000e-01
Pole_2 -1.57046e+03 0.00000e+00 5.00000e-01
Zeros(Hz)
Real Imaginary Qfactor
Zero_1 3.26548e-10 0.00000e+00 -5.00000e-01
Zero_2 -4.82145e+07 0.00000e+00 5.00000e-01
Network function gain(magnitude)= 5.06194e-01
INDEX: pz analysis; hspice; spectre; pole and zero
I just do the pz analysis with spectre(analog simulation environment) and hspice on the same circuit: a two stage op amp with differential input and single output
Their bode plot same as each other, but the report are different:
Hspice's report is correspondance with the bode
But spectre's report is wrong, also I can only get 2 poles and 2 zeros( How can I set the options?).
Anybody comes to this before? Or I have set the options of pz in spectre wrong?
HSPICE:
poles (rad/sec) poles ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-5.0734k 0. -807.4560 0.
-23.2417x 0. -3.6990x 0.
-139.6991x 0. -22.2338x 0.
-533.9424x 0. -84.9796x 0.
-935.9903x 0. -148.9675x 0.
-1.4271g 0. -227.1237x 0.
zeros (rad/sec) zeros ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-137.5430x 0. -21.8906x 0.
-762.5724x 0. -121.3672x 0.
-1.2621g 0. -200.8615x 0.
-1.4666g 0. -233.4214x 0.
2.0379g 0. 324.3371x 0.
2.8481g 0. 453.2941x 0.
SPECTRE
freq=100
Poles(Hz)
Real Imaginary Qfactor
Pole_1 -1.01495e-05 0.00000e+00 5.00000e-01
Pole_2 -1.57046e+03 0.00000e+00 5.00000e-01
Zeros(Hz)
Real Imaginary Qfactor
Zero_1 3.26548e-10 0.00000e+00 -5.00000e-01
Zero_2 -4.82145e+07 0.00000e+00 5.00000e-01
Network function gain(magnitude)= 5.06194e-01