I designed a circuit with current mirror supplied with charge pump.
Current mirror circuit and charge pump circuit each work fine by themselves,
but when I supply charge pump voltage to current mirror voltage source, my signal got weird.
Current mirror
My Rload is varying and I need constant current.
mirroring a 5V square wave by R1=500 ohm, giving 10 mA.
I tested with 12V supply for Rload < 1k and got about constant 10 mA square wave.
Charge pump
since my Rload will be > 1k, could be 5k, I need more votlage supply so I use a charge pump.
I tested my charge pump with 12V supply and got about 40V
So I supply charge pump to current mirror, but got weird signal at Rload, which was working when supplied with 12V.
Also, Vsupply went from 40V to about 30V.
Simulation works though, but I do get spikes of current between square wave 5 and 0 V.
Can anyone please check my circuit?
Am I using correct power parts?
And since I am new electric engineering, is my circuit good design?
Thank you.
fE is just uF
Current mirror circuit and charge pump circuit each work fine by themselves,
but when I supply charge pump voltage to current mirror voltage source, my signal got weird.
Current mirror
My Rload is varying and I need constant current.
mirroring a 5V square wave by R1=500 ohm, giving 10 mA.
I tested with 12V supply for Rload < 1k and got about constant 10 mA square wave.
Charge pump
since my Rload will be > 1k, could be 5k, I need more votlage supply so I use a charge pump.
I tested my charge pump with 12V supply and got about 40V
So I supply charge pump to current mirror, but got weird signal at Rload, which was working when supplied with 12V.
Also, Vsupply went from 40V to about 30V.
Simulation works though, but I do get spikes of current between square wave 5 and 0 V.
Can anyone please check my circuit?
Am I using correct power parts?
And since I am new electric engineering, is my circuit good design?
Thank you.
fE is just uF
Attachments
-
5.9 KB Views: 4
Last edited: