Designer’s Guide Community

‹ Previous topic | Next topic ›

Pages: 1

Bandgap Transient Analysis (Read 2488 times)

Leila

New Member

Offline

Posts: 8

Bandgap Transient Analysis
Nov 23^rd, 2009, 12:10am

Hi,

During the transient analysis, whether it is vdd=1.2 V or step from 0 to 1.2, I will get a weird answer and a jump in bandgap reference voltage, the simulation results are including the voltage from the ideal current source branch Vrefid and the mirror current branch Vref.

The circuit doesn't have the startup. could you advice me what makes the change in voltage especially vbias?!

Regards,leyla

bg-sch.zip

IP Logged

raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: Bandgap Transient Analysis Reply #1 - Nov 23^rd, 2009, 1:15am hi, where is op amp in your schematic Thanks, Rajasekhar.
Back to top	IP Logged

Leila New Member Offline Posts: 8	Re: Bandgap Transient Analysis Reply #2 - Nov 23^rd, 2009, 1:20am Hi, I have used the ideal opamp! Thanks,leyla
Back to top	IP Logged

Mayank

Community Fellow

Offline

Posts: 334

Re: Bandgap Transient Analysis
Reply #3 - Nov 26^th, 2009, 6:44am

Hello Leila,
I dont exactly understand which anomaly are you referring to ??

BUT Here's a point :--- Why dont you try using a Non-ideal Amplifier ??
Ideal Voltage Source has infinite bandwidth, So the gain never falls down to ZERO before phase crosses 180 degrees, Hence your feedback loop will never be stable with an ideal amplifier with Infinite Bandwidth....

thanx,
mayank.

IP Logged

Pages: 1

‹ Previous topic | Next topic ›