请问怎么消除LDO中的共轭极点
时间：10-02
整理：3721RD
点击：
在对ldo做开环频率特性仿真时发现出现了很多共轭极零点对，严重影响了环路稳定性。比如下面这样的 请问这些共轭的极零点是怎么产生的，该如何消除呢
poles (rad/sec) poles ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-647.5153k 0. -103.0553k 0.
2.4266x 2.1366g 386.2091k 340.0456x
2.4266x -2.1366g 386.2091k -340.0456x
-6.2383x 41.8075x -992.8555k 6.6539x
-6.2383x -41.8075x -992.8555k -6.6539x
-8.3755x 0. -1.3330x 0.
-125.3032x 0. -19.9426x 0.
-157.9078x 130.3308x -25.1318x 20.7428x
-157.9078x -130.3308x -25.1318x -20.7428x
-160.2610x 0. -25.5063x 0.
-554.6786x 0. -88.2798x 0.
-790.4263x 0. -125.8003x 0.
-954.1746x 0. -151.8616x 0.
-1.0282g 0. -163.6487x 0.
-1.7103g 0. -272.2043x 0.
-1.8999g 0. -302.3841x 0.
-2.7443g 0. -436.7655x 0.
-3.0859g 0. -491.1404x 0.
-3.2674g 0. -520.0183x 0.
-3.9267g 0. -624.9493x 0.
-5.2728g 0. -839.1947x 0.
-6.1747g 3.0310g -982.7408x 482.3919x
-6.1747g -3.0310g -982.7408x -482.3919x
-6.4418g 0. -1.0252g 0.
-6.5997g -1.3448g -1.0504g -214.0311x
-6.5997g 1.3448g -1.0504g 214.0311x
-12.1895g 0. -1.9400g 0.
-14.6858g 0. -2.3373g 0.
-29.8962g 0. -4.7581g 0.
-67.3424g 0. -10.7179g 0.
-279.7558g 0. -44.5245g 0.
-289.3704g 0. -46.0547g 0.
zeros (rad/sec) zeros ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-801.4735k 2.1265g -127.5585k 338.4503x
-801.4735k -2.1265g -127.5585k -338.4503x
-8.3734x 0. -1.3327x 0.
-125.3032x 0. -19.9426x 0.
-157.9101x -130.3171x -25.1322x -20.7406x
-157.9101x 130.3171x -25.1322x 20.7406x
-166.0539x 0. -26.4283x 0.
-573.6539x 0. -91.2999x 0.
-578.5310x 1.2014g -92.0761x 191.2025x
-578.5310x -1.2014g -92.0761x -191.2025x
-791.0936x 0. -125.9065x 0.
-954.1687x 0. -151.8607x 0.
-1.7109g 0. -272.3010x 0.
-1.8997g 0. -302.3440x 0.
-3.2674g 0. -520.0190x 0.
-3.4121g 0. -543.0456x 0.
-3.9342g 0. -626.1398x 0.
-5.3604g -3.7810g -853.1397x -601.7602x
-5.3604g 3.7810g -853.1397x 601.7602x
-6.3187g -2.4546g -1.0056g -390.6544x
-6.3187g 2.4546g -1.0056g 390.6544x
-6.4422g 0. -1.0253g 0.
-6.7558g 0. -1.0752g 0.
9.0165g 0. 1.4350g 0.
-12.1895g 0. -1.9400g 0.
-14.6897g 0. -2.3379g 0.
-29.8960g 0. -4.7581g 0.
31.9809g 0. 5.0899g 0.
-67.3409g 0. -10.7176g 0.
202.1280g 0. 32.1697g 0.
-279.7529g 0. -44.5241g 0.
-289.3704g 0. -46.0547g 0.
poles (rad/sec) poles ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-647.5153k 0. -103.0553k 0.
2.4266x 2.1366g 386.2091k 340.0456x
2.4266x -2.1366g 386.2091k -340.0456x
-6.2383x 41.8075x -992.8555k 6.6539x
-6.2383x -41.8075x -992.8555k -6.6539x
-8.3755x 0. -1.3330x 0.
-125.3032x 0. -19.9426x 0.
-157.9078x 130.3308x -25.1318x 20.7428x
-157.9078x -130.3308x -25.1318x -20.7428x
-160.2610x 0. -25.5063x 0.
-554.6786x 0. -88.2798x 0.
-790.4263x 0. -125.8003x 0.
-954.1746x 0. -151.8616x 0.
-1.0282g 0. -163.6487x 0.
-1.7103g 0. -272.2043x 0.
-1.8999g 0. -302.3841x 0.
-2.7443g 0. -436.7655x 0.
-3.0859g 0. -491.1404x 0.
-3.2674g 0. -520.0183x 0.
-3.9267g 0. -624.9493x 0.
-5.2728g 0. -839.1947x 0.
-6.1747g 3.0310g -982.7408x 482.3919x
-6.1747g -3.0310g -982.7408x -482.3919x
-6.4418g 0. -1.0252g 0.
-6.5997g -1.3448g -1.0504g -214.0311x
-6.5997g 1.3448g -1.0504g 214.0311x
-12.1895g 0. -1.9400g 0.
-14.6858g 0. -2.3373g 0.
-29.8962g 0. -4.7581g 0.
-67.3424g 0. -10.7179g 0.
-279.7558g 0. -44.5245g 0.
-289.3704g 0. -46.0547g 0.
zeros (rad/sec) zeros ( hertz)
**********************************************************************
real imag real imag
0. 0. 0. 0.
-801.4735k 2.1265g -127.5585k 338.4503x
-801.4735k -2.1265g -127.5585k -338.4503x
-8.3734x 0. -1.3327x 0.
-125.3032x 0. -19.9426x 0.
-157.9101x -130.3171x -25.1322x -20.7406x
-157.9101x 130.3171x -25.1322x 20.7406x
-166.0539x 0. -26.4283x 0.
-573.6539x 0. -91.2999x 0.
-578.5310x 1.2014g -92.0761x 191.2025x
-578.5310x -1.2014g -92.0761x -191.2025x
-791.0936x 0. -125.9065x 0.
-954.1687x 0. -151.8607x 0.
-1.7109g 0. -272.3010x 0.
-1.8997g 0. -302.3440x 0.
-3.2674g 0. -520.0190x 0.
-3.4121g 0. -543.0456x 0.
-3.9342g 0. -626.1398x 0.
-5.3604g -3.7810g -853.1397x -601.7602x
-5.3604g 3.7810g -853.1397x 601.7602x
-6.3187g -2.4546g -1.0056g -390.6544x
-6.3187g 2.4546g -1.0056g 390.6544x
-6.4422g 0. -1.0253g 0.
-6.7558g 0. -1.0752g 0.
9.0165g 0. 1.4350g 0.
-12.1895g 0. -1.9400g 0.
-14.6897g 0. -2.3379g 0.
-29.8960g 0. -4.7581g 0.
31.9809g 0. 5.0899g 0.
-67.3409g 0. -10.7176g 0.
202.1280g 0. 32.1697g 0.
-279.7529g 0. -44.5241g 0.
-289.3704g 0. -46.0547g 0.