Patent ID: 7348851

Claim:
A Miller-compensated amplifier having an amplifier input pair and an amplifier output, comprising: a first gain stage having the amplifier input pair as a first input pair, receiving an input voltage pair and a first output pair outputting a first current pair (i 1 and i 1 ′); a second gain stage having a second input pair receiving a second current pair (i 2 and i 2 ′), and having a second output pair outputting a third current pair (i 3 and i 3 ′), the second gain stage amplifying a small signal part of the second current pair by a first gain to form a small signal part of the third current pair and a DC component of the second current pair by a second gain to form a DC component of the third current pair; a third gain stage having a third input pair receiving the third current pair (i 3 and i 3 ′) and converting the third current pair (i 3 and i 3 ′) to generate an output voltage at the amplifier output; and a capacitor coupled between the amplifier output and one of the second gain stage input pair; wherein one of the second current pair is a sum of one of the first current pair and a fourth current (i 2 =i 1 +i 4 ) and the other of the second current pair equals to the other of the first current pair (i 2 ′=i 1 ′) wherein the fourth current i 4 is through the capacitor.