Patent ID: 6525608
Filing Date: 2003-02-25
Classification: H03F

Abstract:
An amplifier comprising:a first differential pair comprising first and second transistors; a first cascode transistor coupled to the first transistor of the first differential pair to form a folded-cascode pair, the first cascode transistor having a first terminal and a second terminal; a first current mirror comprising first and second transistors to bias currents in the first and second transistors of the first differential pair, wherein the first transistor of the first current mirror is coupled to bias current in the first cascode transistor; a second differential pair comprising first and second transistors; a second cascode transistor coupled to the first transistor of the second differential pair to form a folded-cascode pair, the second cascode transistor having a first terminal and a second terminal; a second current mirror comprising first and second transistors to bias currents in the first and second transistors of the second differential pair, wherein the first transistor of the second current mirror is coupled to bias current in the second cascode transistor; and a first auxiliary amplifier to provide negative feedback from the first terminal of the first cascode transistor to the second terminal of the first cascode transistor and to provide negative feedback from the first terminal of the second cascode transistor to the second terminal of the second cascode transistor, wherein the second terminals of the first and second cascode transistors are at a same potential.