Help me to understand gainstage of pipeline ADC

Status
Not open for further replies.
S

snoop835

Advanced Member level 4
Joined
Feb 7, 2005
Messages
102
Helped
6
Reputation
12
Reaction score
3
Trophy points
1,298
Location
Penang, Malaysia
Activity points
1,371
Hi all,

Anyone can help me to understand the switch capacitor circuit as shown in FIGURE 1 attachment. This circuit is used in a gainstage of pipeline ADC. I am looking for a mathematics behind the circuit operation. How does the circuit subtract the DAC output (Vdac +-) from the original input to create a residue voltage?

Anyone can derive the equations for me and explain how the circuit operates>

thanks
 

in phi_1 the cs an cf were incharge to vin,and phi_1p was used to cancel charge injection by the switches-bottom sampling.in phi_2 the charge in the cs is vref,and the cf is 2vin-vref,so it's function is substraction and 2 gain.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…