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Plotting characteristics curve of Phase-frequency detector (PFD)

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Remove ARTIST and PSF.
Set POST
Click to expand...
I did what you said, then the only difference with the previous simulation is there is a .sn0 now
1023.png
 

Code: 
.option POST
.temp 25
.GLOBAL gnd! vdd!

.param fund_period=2n
.param delta_phase_deg=0.0
.param tdelay='(delta_phase_deg/360)*fund_period'

xi12 vdd! down up out_clk ref_clk start pfdv2_sch
v17 start gnd! dc=0 pulse ( 0 1.8 500p 1p 0 0.5 1)

v16 out_clk gnd! dc=0 pulse(0 1.8 '1.1*fund_period+tdelay'
+ 5p 5p 'fund_period/2' fund_period)

v2  ref_clk gnd! dc=0 pulse(0 1.8 '1.1*fund_period'
+ 5p 5p 'fund_period/2' fund_period)

v5 vdd! gnd! dc=1.8
c18 vctrl- gnd! c=.8p
c7 vctrl+ gnd! c=.8p
xi17 down up vctrl+ vctrl- cpv2_sch

.tran .1n 75n start=0
.sn tres='fund_period/10' period=fund_period
+ trinit='5*fund_period' maxtrinitcycles=5
+ sweep delta_phase_deg lin 101 -360 360
.op All 0
.option opfile=1 split_dp=1

.probe i1(c7)
.probe i2(c18)
.end
 

rafgamo said:
I did what you said, then the only difference with the previous simulation is there is a .sn0 now
Click to expand...
Show me time domain waveform of ref_clk and out_clk of .sn0.
I don't mean .tr0.

rafgamo said:
Code: 
.option POST
.temp 25
.GLOBAL gnd! vdd!
.....[snipped]
c18 vctrl- gnd! c=.8p
c7 vctrl+ gnd! c=.8p
.....[snipped]
.probe i1(c7)
.probe i2(c18)
.end
Click to expand...
Try
.probe snfd i(c7)[0]
.probe snfd ir(c7)[0]
.probe snfd i(c18)[0]
.probe snfd ir(c18)[0]
 
Last edited:

Show me time domain waveform of ref_clk and out_clk of .sn0
Click to expand...
1023a.png

Try
.probe snfd i(c7)[0]
.probe snfd ir(c7)[0]
.probe snfd i(c18)[0]
.probe snfd ir(c18)[0]
Click to expand...
I also tried putting this into the netlist and got a .snf0 file
 


Show me time domain waveform of i(c18) and i(c7) of .sn0.
Here you have to insert followings.
.probe i(c18) i(c7)
 

Show me time domain waveform of i(c18) and i(c7) of .sn0
Click to expand...
But can't see any i(c18) and i(c7).
lkd.png

I already inserted the .probe i(c18) i(c7) as what you advised.
Code: 
.option PARHIER = LOCAL

.option POST
.temp 25

.GLOBAL gnd! vdd!

.param fund_period=2n
.param delta_phase_deg=0.0
.param tdelay='(delta_phase_deg/360)*fund_period'


xi12 vdd! down up out_clk ref_clk start pfdv2_sch
v17 start gnd! dc=0 pulse ( 0 1.8 500p 1p 0 0.5 1)

v16 out_clk gnd! dc=0 pulse(0 1.8 '1.1*fund_period+tdelay'
+ 5p 5p 'fund_period/2' fund_period)

v2  ref_clk gnd! dc=0 pulse(0 1.8 '1.1*fund_period'
+ 5p 5p 'fund_period/2' fund_period)

v5 vdd! gnd! dc=1.8
c18 vctrl- gnd! c=.8p
c7 vctrl+ gnd! c=.8p
xi17 down up vctrl+ vctrl- cpv2_sch

.tran .1n 75n start=0
.sn tres='fund_period/10' period=fund_period
+ trinit='5*fund_period' maxtrinitcycles=5
+ sweep delta_phase_deg lin 101 -360 360
.op All 0
.option opfile=1 split_dp=1

.probe i1(c7)
.probe i1(c18)
.probe snfd i(c7)[0]
.probe snfd ir(c7)[0]
.probe snfd i(c18)[0]
.probe snfd ir(c18)[0]
.probe i(c18) i(c7)
.end
 

Attachments

  • lkd.png
    lkd.png
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Sorry try
.probe sn i(c18) i(c7)

.probe snfd i(18) i(c7)
.probe snfd i(18)[0] i(c7)[0]

.probe snfd ir(c18) ir(c7)
.probe snfd ir(c18)[0] ir(c7)[0]

Plot i(c18) and i(c7) of "input.sn0".

Your results of ir1(c18):(0) and ir1(c7):(0) are both extraordinary.

Plot i(c18) and i(c7) of "input.snf0", here you have to select real() and index=0 from Custom waveView.

Try inseart follwing into netlist.
.measure sn In AVG i(c18)
.measure sn Ip AVG i(c7)
.measure sn Ipump param='In+Ip'
And plot them. Show me results.
 
Last edited:

Plot i(c18) and i(c7) of "input.sn0" are reasonable.

Try following
Code: 
.sn tone='1/fund_period' nharms=10
+ trinit='5*fund_period' maxtrinitcycles=5
+ sweep delta_phase_deg lin 101 -360 360
instead of
Code: 
.sn tres='fund_period/10' period=fund_period
+ trinit='5*fund_period' maxtrinitcycles=5
+ sweep delta_phase_deg lin 101 -360 360
Then plot ir1(c18):(0) and ir1(c7):(0) of .snf0.

You use "HSPICE RF -- D-2010.03-SP2 (Aug 26 2010)".
It is relative old.
Do you have newer version ?
 

Then plot ir1(c18):(0) and ir1(c7):(0) of .snf0
Click to expand...
Screenshot_2.pngScreenshot_4.png

You use "HSPICE RF -- D-2010.03-SP2 (Aug 26 2010)".
It is relative old.
Do you have newer version ?
Click to expand...
Yeah its pretty old, and its the only version our school provides.
 

In #29, x-axis is phase from -360 to 360.

Since you sweep "delta_phase_deg",
dependencies of data in "*.sn0" are [delta_phase_deg, time],
dependencies of data in "*.snf0" are [delta_phase_deg, harmonic_index].

For example, ir1(c1):0 in "*.snf0" mean real part of i1(c1) for harmonic_index=0,
so its dependecy, that is, x-axsis is "delta_phase_deg".
However it is not in #35.

Show me netlist again.

Example
For a demonstration of using Shooting Newton analysis you can run the pdfcpGain.sp file shipped with the HSPICE RF distribution, located in the directory $<installdir>/hspicerf/examples.
This example performs analysis on a D-flipflop phase frequency divider with charge pump, implemented in 50nm technology.
The example is configured to measure the gain (volts per degree) of the DFF PFD and tri-state output combination.
 
Last edited:

Code: 
.option PARHIER = LOCAL

.option POST
.temp 25

.GLOBAL gnd! vdd!

.param fund_period=2n
.param delta_phase_deg=0.0
.param tdelay='(delta_phase_deg/360)*fund_period'

xi12 vdd! down up out_clk ref_clk start pfdv2_sch
v17 start gnd! dc=0 pulse ( 0 1.8 500p 1p 0 0.5 1)

v16 out_clk gnd! dc=0 pulse(0 1.8 '1.1*fund_period+tdelay'
+ 5p 5p 'fund_period/2' fund_period)

v2  ref_clk gnd! dc=0 pulse(0 1.8 '1.1*fund_period'
+ 5p 5p 'fund_period/2' fund_period)

v5 vdd! gnd! dc=1.8
c18 vctrl- gnd! c=.8p
c7 vctrl+ gnd! c=.8p
xi17 down up vctrl+ vctrl- cpv2_sch

.tran .1n 75n start=0
.sn tone='1/fund_period' nharms=10
+ trinit='5*fund_period' maxtrinitcycles=5
+ sweep delta_phase_deg lin 101 -360 360

.op All 0
.option opfile=1 split_dp=1

.probe i1(c7)
.probe i1(c18)
.probe snfd i(c7)[0]
.probe snfd i(c18)[0]
.probe snfd i(c18) i(c7)
.probe snfd i(c18)[0] i(c7)[0]

.probe snfd ir(c18)[0]
.probe snfd ir(c7)[0]
.probe snfd ir(c18) ir(c7)
.probe snfd ir(c18)[0] ir(c7)[0]

.probe sn i(c18) i(c7)

.measure sn Ip AVG i(c18)
.measure sn In AVG i(c7)
.measure sn Ipump param='In+Ip'

.end
 

.probe i1(c7)
.probe i1(c18)
.probe snfd i(c7)[0]
.probe snfd i(c18)[0]
*.probe snfd i(c18) i(c7)
*.probe snfd i(c18)[0] i(c7)[0]

.probe snfd ir(c18)[0]
.probe snfd ir(c7)[0]
*.probe snfd ir(c18) ir(c7)
*.probe snfd ir(c18)[0] ir(c7)[0]

.probe sn i(c18) i(c7)
 

I inserted the lines in #38... Here is the plot for ir1(c18):(0) and ir1(c7):(0) of .snf0
snf0_irc7_irc18.png
 

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