expert help !!!

[feng]

this is a DC-DC boost converter schematic. Anybody can explain how does it work? and how to determine the L, C and Gain of 2 opamp. Vin range from 0.9 to 1.5 V, vout is 1.8 V. This is power supply part for CMOS circuit.

 

[feng]

schematic

 

[spacespace]

this is buck boost step-up converter, used when a higher output voltage than input voltage is required.
if transistor is on V(before the diode) =Vin, and if transistor is off, the inductor current flows through the diode giving V(before the diode) =Vout.
and you have to ensure the duty ration to make sure continuous current flow.

 

[feng]

up up

thanx spacespace and dell

but once you have the input and output, how to decide the L and C. That's the first problem I have to do, then design those 2 opamp