跪求高手指点 主次极点 相位裕度

http://bbs.eetop.cn/thread-273212-1-1.html

这是我的主运放和辅运放在一起仿真的结果 但是现在遇到的问题 如何从图中找主次极点的位置，因为增益提高型放大器要求
b*GBW_main<GBW_booster<主运放的次极点。
其中b为反馈系数
我的主运放单独仿真的时候 gain=43.77dB，Unity Bandwidth=579MHz
辅助运放BNgain=45.7dB，Unity Bandwidth=4.258GHz
辅助运放BPgain=45.83dB，Unity Bandwidth=1.73GHz
1跪求高手指点 如何才能从图上中 找到主极点和次极点的位置
2 对于BP和BN 是否要在其输出端加上电容，以使他们的Unity Bandwidth小于主运放的单位增益带宽579MHz
3 如果需要加的话，学生我还有一点不明白 从上图中可以明显的看出 在整个系统仿真时的BＰ和BＮ的Unity Bandwidth已经
明显小于主运放的单位增益带宽579MHz，若 再在其输出端加上电容的话，BＰ和BＮ的Unity Bandwidth不是会更小吗?
4 大神拉扎维的书上第十章虽然有介绍 但是看得我云里雾里 还是不太清楚 主次极点的位置 究竟是怎么一回事?
希望有高手能够解答我的疑惑

这种结构，主极点肯定是在运放输出端了
次极点是受寄生影响大，在Y点

[quote]这种结构，主极点肯定是在运放输出端了
次极点是受寄生影响大，在Y点
confiope 发表于 2010-11-5 08:37
[/quot]
您好 谢谢您的关注
我知道在电路图中是Y点没错，我想问的是在仿真出来的图中，究竟哪一点才是
整个运放的主极点 和 次极点

1。大概就M2， M4吧
2。BN,BP的GBW要保证： b*GBW_main<GBW_booster<主运放的次极点。之所以要加补偿电容的原因是因为：同时要保证BN,BP的环路稳定，让这个环路的主极点和非主极点分开。你的BN,BP GBW太小了，在GBW_main之前会出现doublets

谢谢您的关注您说“你的BN,BP GBW太小了，在GBW_main之前会出现doublets”
这里您所指的是单独仿真时的“BN,BP GBW太小了?” 还是指“在系统仿真时的BN,BP GBW太小了?”
希望您能够告诉我。

靠近原点的是主极点，远离原点是次极点。

这是的pz仿真的结果
pz仿真的设置为：
1 输入和输出都是选的单端的，我不知道这个是否会有影响
2 seep variable 我选的是Frequency
3 Add Specific Points 我填的是1G因为我不知道这一项是什么意思
4“Warning from spectre during PZ analysis `pz'.
BSIM3v3 MOS Transistor - frequency dependent components are present in the circuit,
approximated as AC equivalents at sweeping frequency for pz analysis.
”
5 Warning from spectre at freq = 1 GHz during PZ analysis `pz'.
Arithmetic exception in analysis `pz' .
一直没整明白这句话是什么意思
求高手指点
不胜感激
Command line:
/eda/cadence/mmsim611/tools.lnx86/spectre/bin/32bit/spectre -env\
artist5.1.0 +escchars +log ../psf/spectre.out +inter=mpsc\
+mpssession=spectre0_3377_18 -format sst2 -raw ../psf\
+lqtimeout 900 -maxw 5 -maxn 5 input.scs
spectre pid = 7204
Loading /eda/cadence/mmsim611/tools.lnx86/cmi/lib/4.0/libinfineon_sh.so ...
Loading /eda/cadence/mmsim611/tools.lnx86/cmi/lib/4.0/libnortel_sh.so ...
Loading /eda/cadence/mmsim611/tools.lnx86/cmi/lib/4.0/libphilips_sh.so ...
Loading /eda/cadence/mmsim611/tools.lnx86/cmi/lib/4.0/libsparam_sh.so ...
Loading /eda/cadence/mmsim611/tools.lnx86/cmi/lib/4.0/libstmodels_sh.so ...
spectre (ver. 6.1.0.151 -- 26 May 2006).
Includes RSA BSAFE(R) Cryptographic or Security Protocol Software from RSA Security, Inc.
Simulating `input.scs' on ic at 10:53:28 AM, Fri Nov 5, 2010.
Using new Spectre Parser.
Circuit inventory:
nodes 98
equations 357
bsim3v3 127
capacitor 4
isource 3
resistor 2
vcvs 1
vsource 4
Entering remote command mode using MPSC service (spectre, ipi, v0.0, spectre0_3377_18, ).
*****************************************
PZ Analysis `pz': freq = (1 GHz -> 1 GHz)
*****************************************
Warning from spectre during PZ analysis `pz'.
BSIM3v3 MOS Transistor - frequency dependent components are present in the circuit,
approximated as AC equivalents at sweeping frequency for pz analysis.
Poles (Hz)
RealImaginaryQfactor
1-2.60147e+040.00000e+005.00000e-01
2-6.46276e+070.00000e+005.00000e-01
3-1.26011e+08+/- 2.18748e+075.07478e-01
4-3.77911e+07+/- 1.32293e+081.82033e+00
5-1.09887e+08+/- 1.33416e+087.86460e-01
6-1.25225e+08+/- 1.70516e+088.44713e-01
7-2.43349e+08+/- 6.44778e+075.17253e-01
8-2.50176e+08+/- 3.77051e+075.05647e-01
9-3.20005e+080.00000e+005.00000e-01
10-3.41166e+08+/- 1.88031e+085.70911e-01
11-2.93042e+08+/- 3.91997e+088.35075e-01
12-4.89829e+080.00000e+005.00000e-01
13-4.96485e+08+/- 5.46315e+055.00000e-01
14-5.67843e+080.00000e+005.00000e-01
15-5.87052e+080.00000e+005.00000e-01
16-5.91534e+080.00000e+005.00000e-01
17-7.68400e+080.00000e+005.00000e-01
18-8.17298e+08+/- 1.64192e+085.09990e-01
19-8.20451e+08+/- 1.62648e+085.09730e-01
20-1.01835e+090.00000e+005.00000e-01
21-1.19012e+090.00000e+005.00000e-01
22-1.24813e+090.00000e+005.00000e-01
23-5.79299e+08+/- 1.20620e+091.15493e+00
24-1.43507e+090.00000e+005.00000e-01
25-2.07617e+090.00000e+005.00000e-01
26-1.35930e+09+/- 2.12203e+099.26972e-01
27-2.77139e+090.00000e+005.00000e-01
28-2.82584e+090.00000e+005.00000e-01
29-3.61200e+090.00000e+005.00000e-01
30-3.78853e+09+/- 2.60795e+085.01183e-01
31-3.81654e+090.00000e+005.00000e-01
32-3.87942e+09+/- 7.82125e+085.10060e-01
33-4.05294e+090.00000e+005.00000e-01
34-3.91312e+09+/- 1.85745e+095.53470e-01
35-4.70587e+090.00000e+005.00000e-01
36-6.35037e+090.00000e+005.00000e-01
37-7.66266e+090.00000e+005.00000e-01
38-7.81104e+090.00000e+005.00000e-01
39-8.26124e+090.00000e+005.00000e-01
Zeros (Hz)
at V(Vout_N,0)/V5
RealImaginaryQfactor
1-6.46179e+070.00000e+005.00000e-01
2-1.25810e+08+/- 2.18787e+075.07504e-01
3-4.19785e+07+/- 1.38220e+081.72057e+00
4-1.09898e+08+/- 1.33353e+087.86191e-01
5-1.25247e+08+/- 1.70525e+088.44647e-01
6-2.50201e+08+/- 3.76936e+075.05642e-01
7-2.45670e+08+/- 6.48268e+075.17115e-01
8-3.24902e+080.00000e+005.00000e-01
9-3.45335e+08+/- 1.87223e+085.68754e-01
10-2.93097e+08+/- 3.91978e+088.34949e-01
11-4.92229e+080.00000e+005.00000e-01
12-4.96222e+08+/- 1.16203e+065.00001e-01
13-5.51051e+080.00000e+005.00000e-01
14-5.86218e+080.00000e+005.00000e-01
15-5.88923e+080.00000e+005.00000e-01
16-7.59055e+080.00000e+005.00000e-01
17-8.17397e+08+/- 1.64146e+085.09982e-01
18-8.20484e+08+/- 1.62519e+085.09714e-01
19-1.01913e+090.00000e+005.00000e-01
20-1.19758e+090.00000e+005.00000e-01
21-1.24839e+090.00000e+005.00000e-01
22-5.74868e+08+/- 1.20622e+091.16218e+00
23-1.40322e+090.00000e+005.00000e-01
24-2.07437e+090.00000e+005.00000e-01
25-2.77444e+090.00000e+005.00000e-01
26-2.16839e+09+/- 1.73329e+096.40108e-01
27-2.82637e+090.00000e+005.00000e-01
28-3.61085e+090.00000e+005.00000e-01
29-3.70960e+09+/- 6.47421e+085.07558e-01
30-3.80338e+090.00000e+005.00000e-01
31-3.80555e+09+/- 2.76872e+085.01322e-01
32-4.04352e+090.00000e+005.00000e-01
33-4.84808e+09+/- 2.87862e+095.81498e-01
34-6.33992e+090.00000e+005.00000e-01
35-6.99481e+090.00000e+005.00000e-01
36-7.66429e+090.00000e+005.00000e-01
Constant factor =3.09167e+27
DC gain =2.23628e+01
Accumulated DC solution time = 30 ms.
Intrinsic pz analysis time = 2.77 s.
Warning from spectre at freq = 1 GHz during PZ analysis `pz'.
Arithmetic exception in analysis `pz' .
Total time required for pz analysis `pz' was 2.8 s.

*****************************************
AC Analysis `ac': freq = (1 Hz -> 10 GHz)
*****************************************
Trying `homotopy = gmin'.
ac: freq = 2.512 Hz(4 %), step = 927 mHz(2 %)
ac: freq = 6.31 Hz(8 %), step = 2.329 Hz(2 %)
ac: freq = 25.12 Hz(14 %), step = 9.27 Hz(2 %)
ac: freq = 63.1 Hz(18 %), step = 23.29 Hz(2 %)
ac: freq = 251.2 Hz(24 %), step = 92.7 Hz(2 %)
ac: freq = 631 Hz(28 %), step = 232.9 Hz(2 %)
ac: freq = 2.512 kHz(34 %), step = 927 Hz(2 %)
ac: freq = 6.31 kHz(38 %), step = 2.329 kHz(2 %)
ac: freq = 25.12 kHz(44 %), step = 9.27 kHz(2 %)
ac: freq = 63.1 kHz(48 %), step = 23.29 kHz(2 %)
ac: freq = 251.2 kHz(54 %), step = 92.7 kHz(2 %)
ac: freq = 631 kHz(58 %), step = 232.9 kHz(2 %)
ac: freq = 2.512 MHz(64 %), step = 927 kHz(2 %)
ac: freq = 6.31 MHz(68 %), step = 2.329 MHz(2 %)
ac: freq = 25.12 MHz(74 %), step = 9.27 MHz(2 %)
ac: freq = 63.1 MHz(78 %), step = 23.29 MHz(2 %)
ac: freq = 251.2 MHz(84 %), step = 92.7 MHz(2 %)
ac: freq = 631 MHz(88 %), step = 232.9 MHz(2 %)
ac: freq = 2.512 GHz(94 %), step = 927 MHz(2 %)
ac: freq = 6.31 GHz(98 %), step = 2.329 GHz(2 %)
Accumulated DC solution time = 130 ms.
Intrinsic ac analysis time = 130 ms.
Total time required for ac analysis `ac' was 260 ms.

******************
DC Analysis `dcOp'
******************
Important parameter values:
reltol = 1e-03
abstol(V) = 1 uV
abstol(I) = 1 pA
temp = 27 C
tnom = 27 C
tempeffects = all
gmin = 1 pS
maxrsd = 0 Ohm
mos_method = s
mos_vres = 50 mV
Convergence achieved in 2 iterations.
Total time required for dc analysis `dcOp' was 20 ms.
dcOpInfo: writing operating point information to rawfile.
modelParameter: writing model parameter values to rawfile.
element: writing instance parameter values to rawfile.
outputParameter: writing output parameter values to rawfile.
designParamVals: writing netlist parameters to rawfile.
primitives: writing primitives to rawfile.
subckts: writing subcircuits to rawfile.
*****************************************
PZ Analysis `pz': freq = (1 GHz -> 1 GHz)
*****************************************
Warning from spectre during PZ analysis `pz'.
BSIM3v3 MOS Transistor - frequency dependent components are present in the circuit,
approximated as AC equivalents at sweeping frequency for pz analysis.
Poles (Hz)
RealImaginaryQfactor
1-2.60147e+040.00000e+005.00000e-01
2-6.46276e+070.00000e+005.00000e-01
3-1.26011e+08+/- 2.18748e+075.07478e-01
4-3.77911e+07+/- 1.32293e+081.82033e+00
5-1.09887e+08+/- 1.33416e+087.86460e-01
6-1.25225e+08+/- 1.70516e+088.44713e-01
7-2.43349e+08+/- 6.44778e+075.17253e-01
8-2.50176e+08+/- 3.77051e+075.05647e-01
9-3.20005e+080.00000e+005.00000e-01
10-3.41166e+08+/- 1.88031e+085.70911e-01
11-2.93042e+08+/- 3.91997e+088.35075e-01
12-4.89829e+080.00000e+005.00000e-01
13-4.96485e+08+/- 5.46315e+055.00000e-01
14-5.67843e+080.00000e+005.00000e-01
15-5.87052e+080.00000e+005.00000e-01
16-5.91534e+080.00000e+005.00000e-01
17-7.68400e+080.00000e+005.00000e-01
18-8.17298e+08+/- 1.64192e+085.09990e-01
19-8.20451e+08+/- 1.62648e+085.09730e-01
20-1.01835e+090.00000e+005.00000e-01
21-1.19012e+090.00000e+005.00000e-01
22-1.24813e+090.00000e+005.00000e-01
23-5.79299e+08+/- 1.20620e+091.15493e+00
24-1.43507e+090.00000e+005.00000e-01
25-2.07617e+090.00000e+005.00000e-01
26-1.35930e+09+/- 2.12203e+099.26972e-01
27-2.77139e+090.00000e+005.00000e-01
28-2.82584e+090.00000e+005.00000e-01
29-3.61200e+090.00000e+005.00000e-01
30-3.78853e+09+/- 2.60795e+085.01183e-01
31-3.81654e+090.00000e+005.00000e-01
32-3.87942e+09+/- 7.82125e+085.10060e-01
33-4.05294e+090.00000e+005.00000e-01
34-3.91312e+09+/- 1.85745e+095.53470e-01
35-4.70587e+090.00000e+005.00000e-01
36-6.35037e+090.00000e+005.00000e-01
37-7.66266e+090.00000e+005.00000e-01
38-7.81104e+090.00000e+005.00000e-01
39-8.26124e+090.00000e+005.00000e-01
Zeros (Hz)
at V(Vout_N,0)/V5
RealImaginaryQfactor
1-6.46179e+070.00000e+005.00000e-01
2-1.25810e+08+/- 2.18787e+075.07504e-01
3-4.19785e+07+/- 1.38220e+081.72057e+00
4-1.09898e+08+/- 1.33353e+087.86191e-01
5-1.25247e+08+/- 1.70525e+088.44647e-01
6-2.50201e+08+/- 3.76936e+075.05642e-01
7-2.45670e+08+/- 6.48268e+075.17115e-01
8-3.24902e+080.00000e+005.00000e-01
9-3.45335e+08+/- 1.87223e+085.68754e-01
10-2.93097e+08+/- 3.91978e+088.34949e-01
11-4.92229e+080.00000e+005.00000e-01
12-4.96222e+08+/- 1.16203e+065.00001e-01
13-5.51051e+080.00000e+005.00000e-01
14-5.86218e+080.00000e+005.00000e-01
15-5.88923e+080.00000e+005.00000e-01
16-7.59055e+080.00000e+005.00000e-01
17-8.17397e+08+/- 1.64146e+085.09982e-01
18-8.20484e+08+/- 1.62519e+085.09714e-01
19-1.01913e+090.00000e+005.00000e-01
20-1.19758e+090.00000e+005.00000e-01
21-1.24839e+090.00000e+005.00000e-01
22-5.74868e+08+/- 1.20622e+091.16218e+00
23-1.40322e+090.00000e+005.00000e-01
24-2.07437e+090.00000e+005.00000e-01
25-2.77444e+090.00000e+005.00000e-01
26-2.16839e+09+/- 1.73329e+096.40108e-01
27-2.82637e+090.00000e+005.00000e-01
28-3.61085e+090.00000e+005.00000e-01
29-3.70960e+09+/- 6.47421e+085.07558e-01
30-3.80338e+090.00000e+005.00000e-01
31-3.80555e+09+/- 2.76872e+085.01322e-01
32-4.04352e+090.00000e+005.00000e-01
33-4.84808e+09+/- 2.87862e+095.81498e-01
34-6.33992e+090.00000e+005.00000e-01
35-6.99481e+090.00000e+005.00000e-01
36-7.66429e+090.00000e+005.00000e-01
Constant factor =2.29334e+27
DC gain =1.65883e+01
Accumulated DC solution time = 10 ms.
Intrinsic pz analysis time = 2.61 s.
Warning from spectre at freq = 1 GHz during PZ analysis `pz'.
Arithmetic exception in analysis `pz' .
Total time required for pz analysis `pz' was 2.62 s.

*****************************************
AC Analysis `ac': freq = (1 Hz -> 10 GHz)
*****************************************
ac: freq = 2.512 Hz(4 %), step = 927 mHz(2 %)
ac: freq = 6.31 Hz(8 %), step = 2.329 Hz(2 %)
ac: freq = 25.12 Hz(14 %), step = 9.27 Hz(2 %)
ac: freq = 63.1 Hz(18 %), step = 23.29 Hz(2 %)
ac: freq = 251.2 Hz(24 %), step = 92.7 Hz(2 %)
ac: freq = 631 Hz(28 %), step = 232.9 Hz(2 %)
ac: freq = 2.512 kHz(34 %), step = 927 Hz(2 %)
ac: freq = 6.31 kHz(38 %), step = 2.329 kHz(2 %)
ac: freq = 25.12 kHz(44 %), step = 9.27 kHz(2 %)
ac: freq = 63.1 kHz(48 %), step = 23.29 kHz(2 %)
ac: freq = 251.2 kHz(54 %), step = 92.7 kHz(2 %)
ac: freq = 631 kHz(58 %), step = 232.9 kHz(2 %)
ac: freq = 2.512 MHz(64 %), step = 927 kHz(2 %)
ac: freq = 6.31 MHz(68 %), step = 2.329 MHz(2 %)
ac: freq = 25.12 MHz(74 %), step = 9.27 MHz(2 %)
ac: freq = 63.1 MHz(78 %), step = 23.29 MHz(2 %)
ac: freq = 251.2 MHz(84 %), step = 92.7 MHz(2 %)
ac: freq = 631 MHz(88 %), step = 232.9 MHz(2 %)
ac: freq = 2.512 GHz(94 %), step = 927 MHz(2 %)
ac: freq = 6.31 GHz(98 %), step = 2.329 GHz(2 %)
Accumulated DC solution time = 40 ms.
Intrinsic ac analysis time = 130 ms.
Total time required for ac analysis `ac' was 170 ms.

******************
DC Analysis `dcOp'
******************
Important parameter values:
reltol = 1e-03
abstol(V) = 1 uV
abstol(I) = 1 pA
temp = 27 C
tnom = 27 C
tempeffects = all
gmin = 1 pS
maxrsd = 0 Ohm
mos_method = s
mos_vres = 50 mV
Convergence achieved in 2 iterations.
Total time required for dc analysis `dcOp' was 10 ms.
dcOpInfo: writing operating point information to rawfile.
modelParameter: writing model parameter values to rawfile.
element: writing instance parameter values to rawfile.
outputParameter: writing output parameter values to rawfile.
designParamVals: writing netlist parameters to rawfile.
primitives: writing primitives to rawfile.
subckts: writing subcircuits to rawfile.

又见到这个了

见过了

最近也在研究gain boosting的doublet，推导它的零极点都应推了将近一个星期实在是推不出来，太繁琐了，看了一些资料结果每篇得出的结果都是不一样的，而且差别还很大，头都晕了，哪位提供点资料?

学习了！

学习中！

在学习中！

关注！