hrkhari
Full Member level 4
Bandgap Reference
Hi Guys:
I had designed a BGR reference circuit, the temperature variation of -20°C- 85°C gives a reference voltage variation of 2mV, and a 20% supply voltage variation gives a around 0.5mV, but the thing is my PSRR is quite screwed up, giving only around 30-40dB of supression. The journals do suggest PSRR in the range of 60-100dB of supression.
Upon consultation, I was informed that PSRR determines the immunity of the reference voltage to power supply variation, but I'm still skeptical on it. If it is true than my power supply sweep variation gives somewhat good reference voltage variation. Can anyone pls guide me in explaining the true means of PSRR and verify the validilty of the previous claim. Suggestion on methods of improving PSRR is also welcomed. Thanks in advance
Rgds
Hi Guys:
I had designed a BGR reference circuit, the temperature variation of -20°C- 85°C gives a reference voltage variation of 2mV, and a 20% supply voltage variation gives a around 0.5mV, but the thing is my PSRR is quite screwed up, giving only around 30-40dB of supression. The journals do suggest PSRR in the range of 60-100dB of supression.
Upon consultation, I was informed that PSRR determines the immunity of the reference voltage to power supply variation, but I'm still skeptical on it. If it is true than my power supply sweep variation gives somewhat good reference voltage variation. Can anyone pls guide me in explaining the true means of PSRR and verify the validilty of the previous claim. Suggestion on methods of improving PSRR is also welcomed. Thanks in advance
Rgds