ddrr
Junior Member level 2
spectre pz analysis
if set eval freq.=200K:
****************
PZ Analysis `pz'
****************
Warning from spectre during PZ analysis `pz'.
Bipolar Junction Transistor - frequency dependent components are present in
the circuit, approximated as AC equivalents at 2.000000e+05Hz for pz
analysis.
ahdl module - frequency dependent components are present in the circuit,
approximated as AC equivalents at 2.000000e+05Hz for pz analysis.
Trying `homotopy = gmin'.
No pole is found
No zero is found
Accumulated DC solution time = 70 ms.
Intrinsic pz analysis time = 290 ms.
Total time required for pz analysis `pz' was 360 ms.
if set eval freq.=300K:
****************
PZ Analysis `pz'
****************
Warning from spectre during PZ analysis `pz'.
Bipolar Junction Transistor - frequency dependent components are present in
the circuit, approximated as AC equivalents at 3.000000e+05Hz for pz
analysis.
ahdl module - frequency dependent components are present in the circuit,
approximated as AC equivalents at 3.000000e+05Hz for pz analysis.
Trying `homotopy = gmin'.
No pole is found
No zero is found
Accumulated DC solution time = 70 ms.
Intrinsic pz analysis time = 280 ms.
Total time required for pz analysis `pz' was 350 ms.
Added after 1 minutes:
Can the circuit containing bjt be analysed using PZ?
Or other method for a substitute?
thx a lot!
Added after 1 minutes:
PS: It is said in the help doc. that:
PZ Analysis (pz)
Description
The PZ analysis linearizes the circuit about the DC operating point and computes the poles and zeros of the linearized network. To compute zeros, users need to specify input sources and output voltages or currents. If no input or output are given, then only poles are computed. In case there are frequency dependent components, poles and zeros are computed by approximating those components as equivalent conductances and capacitances evaluated at 1Hz. The PZ analysis currently uses direct solver for better accuracy. Small to medium circuit size will achieve better performance.
(Note: A frequency dependent component means the capacitance or conductance equivalent representation of the component is freqency varying. Examples are transimission lines or bjts with excess phases. A linear capacitor is not a frequency dependent component.)
if set eval freq.=200K:
****************
PZ Analysis `pz'
****************
Warning from spectre during PZ analysis `pz'.
Bipolar Junction Transistor - frequency dependent components are present in
the circuit, approximated as AC equivalents at 2.000000e+05Hz for pz
analysis.
ahdl module - frequency dependent components are present in the circuit,
approximated as AC equivalents at 2.000000e+05Hz for pz analysis.
Trying `homotopy = gmin'.
No pole is found
No zero is found
Accumulated DC solution time = 70 ms.
Intrinsic pz analysis time = 290 ms.
Total time required for pz analysis `pz' was 360 ms.
if set eval freq.=300K:
****************
PZ Analysis `pz'
****************
Warning from spectre during PZ analysis `pz'.
Bipolar Junction Transistor - frequency dependent components are present in
the circuit, approximated as AC equivalents at 3.000000e+05Hz for pz
analysis.
ahdl module - frequency dependent components are present in the circuit,
approximated as AC equivalents at 3.000000e+05Hz for pz analysis.
Trying `homotopy = gmin'.
No pole is found
No zero is found
Accumulated DC solution time = 70 ms.
Intrinsic pz analysis time = 280 ms.
Total time required for pz analysis `pz' was 350 ms.
Added after 1 minutes:
Can the circuit containing bjt be analysed using PZ?
Or other method for a substitute?
thx a lot!
Added after 1 minutes:
PS: It is said in the help doc. that:
PZ Analysis (pz)
Description
The PZ analysis linearizes the circuit about the DC operating point and computes the poles and zeros of the linearized network. To compute zeros, users need to specify input sources and output voltages or currents. If no input or output are given, then only poles are computed. In case there are frequency dependent components, poles and zeros are computed by approximating those components as equivalent conductances and capacitances evaluated at 1Hz. The PZ analysis currently uses direct solver for better accuracy. Small to medium circuit size will achieve better performance.
(Note: A frequency dependent component means the capacitance or conductance equivalent representation of the component is freqency varying. Examples are transimission lines or bjts with excess phases. A linear capacitor is not a frequency dependent component.)