Bandgap reference design: check items (zt)

You can find the basic thoery/principle of bandgap reference design everywhere, but seldom of them would like to introduce what kind of result should be checked. The following content is abstracted from a report from internet. author KIRAN V BULUSU
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1. Use a temperature varsweep around a bias analysis to verify the temperature coefficient being zero at 300K.
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6Zbg.h"m+t 2. Make sure you have a start-up circuit and that it is functioning properly. If you perform a transient analysis in which you ramp the supply voltage from zero to 5 V, does the output reach the desired level?Y)xe]?YI:l
--When we do a transient analysis on the circuit by ramping the supply voltage from 0V to 5V in 20 nano seconds, the output voltage was stabilized at 1.256V after 12 nano seconds. D^ ap(H&K+w
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3. Check the power supply rejection ratio by varying the +5V supply between +4 and +6 in a dc analysis and observe the change in the output value.|%P6E?0XD
--The DC power supply rejection ratio is 67 dB. The PSRR was calculated as PSRR = 20*log(Vout/Vin)
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phS6D8vT6ML --VIN = 2V (6v-4v) and Vout = 1.2576 – 1.2567 = 1 mV So, PSRR = 66db.
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4. The previous test gives supply voltage sensitivity at low (DC) frequency. What happens to the output voltage if the supply has a high frequency ripple on top of it? (Use the ac analysis to verify the sensitivity of the output voltage to changes in the supply as a function of frequency). _ eU5B0s+tm*~h^
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5. Is your output impedance less than 1 Ohm? Apply a test current source at the output and check the change in output voltage as the load current is varied.eLin]h.[
--The output impedance is 0.2 Ohms.0V$Tz(d%jY)g*zq

r7hL4uCq 6. Even though this circuit is a dc circuit, it uses a feedback loop and thus stability is an issue.Use a test current source at the output and, in a transient analysis, apply a step change to the output current from 1mA to 2mA. Observe the change in the output voltage. Comment on ther9nv @h?[
perceived stability.O
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7. How would you go about fixing the stability problem?
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8. Power Dissipation"qAh~#]R
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>> Attached the file here as it is so popular.
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