xzcv
Newbie level 5
I have several question for this schematic to deisgn:
1.If I want to design dc 0.9v compare with ramp signal ,the M1 & M2 dc voltage should be set in 0.9v or Vdd/2 initially?
2. the net3 should be set in dc Vdd/2 or other dc level voltage when design?
3. Should be (W/L) of M7 & M9 should be the same then to adjust Vg7 & Vg9 in order to reduce systematic offset?
4.the net1 voltage should be as low as possible (higher than Vth7)?
5.if remove M4&M5,net1=net2=1V; if remove M3&M6,net1=net1=1v,but
when I merge them(M3&M4;M5&M6),the net1 voltage is drop to 0.85V? why?
6.If i want to look the gain,should I watch small signal gain(use .ac? ) or dc gain (M1&M2 send dc voltage and use .tf?)?
7.when i want to see offset ,input should be set Vdd/2?
Added after 9 minutes:
schematic here
thank
1.If I want to design dc 0.9v compare with ramp signal ,the M1 & M2 dc voltage should be set in 0.9v or Vdd/2 initially?
2. the net3 should be set in dc Vdd/2 or other dc level voltage when design?
3. Should be (W/L) of M7 & M9 should be the same then to adjust Vg7 & Vg9 in order to reduce systematic offset?
4.the net1 voltage should be as low as possible (higher than Vth7)?
5.if remove M4&M5,net1=net2=1V; if remove M3&M6,net1=net1=1v,but
when I merge them(M3&M4;M5&M6),the net1 voltage is drop to 0.85V? why?
6.If i want to look the gain,should I watch small signal gain(use .ac? ) or dc gain (M1&M2 send dc voltage and use .tf?)?
7.when i want to see offset ,input should be set Vdd/2?
Added after 9 minutes:
schematic here
thank