Requires: SmartSpice & Smartview

Minimum Versions: SMARTSPICE 3.17.26.C

An
inputdeck is used to setup the .LSTB analysis.
The .LSTB analysis is used in single mode to calculate phase, gain margins and frequency characterisrics.
A cx# file is written which contains gain as a function of frequency

• phase_margin(deg)= -8.1393e+001
• gain_margin(db)= -5.7399e+001
• phase_margin_freq(Hz)= 2.0786e+005
• gain_margin_freq(Hz)= 1.4621e+007
• minfreq = 1.0000e-001 at= 1.0000e-001
• loop_gain_at_min_freq(db)= 1.0422e+002

The output
waveform
shows the phase and the gain margin in db as a function of frequency.

Graphics

Input Files

amp.in

*test of  bipolar  amplifier(STABILITY ANALYSIS  VERSION)


v1 Vpos  0  15
v5  Vneg 0 -15 
R1 N004  0  100 
R2 N001  in  1K


R3 N005  N001 1k
C1 N005 N001 3p
xu1 0 N001 vpos  Vneg N003 amp_bipolar
vprobe N003 N004 0           


*modification

C2  N005   0  3p
R4  N005   N004  1k
Vin  in  0  ac  0 


.include amp_bipolar_encrypted.lib



.param freqrange=100MEG

*stability analysis   specification
.LSTB  	DEC 	30 .1 "freqrange" mode=single  vsource=Vprobe 


.option nomod  nodeck  

*some extra  vectors





.end

amp_bipolar_encrypted.lib

@silvaco.file skey=silvaco contents=AtEncryption
@RvvOfrhKMTo4+n0mPsai+/Vdgh2P7X5h

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amp.measure.raw0

Title: *test of  bipolar  amplifier(STABILITY ANALYSIS  VERSION)
Input deck file name: V:\examples\smartspice_web\analysis\005_Stability_lstb_sim\amp.sp
Date: Wed Aug 18 09:59:28 2010
Plotname: Measure Plot
Temperature: 0
Sweepvar: phase_margin(deg)
Sweepmode: 0
Flags: real padded
No. Variables: 6
No. Points: 1         
Source: SmartSpice MultiCore,Platform:0
Version: 3.18.0.R
Variables:	0	phase_margin(deg)	notype
	1	gain_margin(db)	notype
	2	phase_margin_freq(Hz)	notype
	3	gain_margin_freq(Hz)	notype
	4	minfreq	notype
	5	loop_gain_at_min_freq(db)	notype
Values:
 0	-8.139287407910882e+001
	-5.739888160989512e+001
	2.078569881279886e+005
	1.462093388587591e+007
	1.000000000000000e-001
	1.042174898096365e+002