line reglation and TC of bandgap

[chu]

hi all,

(1) what is line regulation means in bandgap ?

(2) temperature coefficient TC's unit in ppm/C, ppm is part per million for what ? doping concentration ?? or ... ??
i only know TC for mV/C.

thanks

 

[Chethan]

hi all,

(1) what is line regulation means in bandgap ?

(2) temperature coefficient TC's unit in ppm/C, ppm is part per million for what ? doping concentration ?? or ... ??
i only know TC for mV/C.

thanks

Hi
Attaching the pdf which explains all the terms used during the designing of an LDO and voltage reference.Hope it helps.

 

[sudheer_vlsi]

Hi,

Line regulation of the LDO means,percentage change in output voltage due to change in supply voltage.
TC of the bandgap is represented in PPM/C,which refers that,per degree change in temperature,how many parts in million ur output voltage will change.

hope it helps.

 

[xerxer]

two parameters of bandgap voltage reference are temperature cofficient and psr (or psrr ) .temperature cofficent is Tc ,its unit is ppm/ ° C,unit of psr is ppm/v .
Tc=1/vref*vrefI/ψT ,psr=1/vref*ψvref/ψvdd .the defination of the two parameters is similar .

 

[huojinsi]

Line regulating means out voltage change is produced by supply voltage varying, its unit is mV or (Vo/Vcc)*100%.
ppm/° C is a conventional standard unit of temperature coefficient, TC=(1/Vref)*(ΨVref/ΨT). For example,Vref=1.25V, ΨVref/ΨT=12.5uv/° C, so TC=(1/1.25v)*12.5uv/° C*10e6=10ppm/° C.
but some also use mv/° C as unit.

 

[jefferson]

i think ppm/°C & mv/°C are two expressions for TC.
anything different is that ppm/°C makes TC much preciser.
anyone know how to make a BGR with less transister?
regards.