Patent ID: 8248165
Filing Date: 2012-08-21
Classification: H03F,H03G

Abstract:
1. An amplifier comprising: a first transistor having a first conducting electrode receiving a current, a control electrode coupled to said first conducting electrode, and a second conducting electrode coupled to a fixed voltage source; a second transistor having a first conducting electrode, a second conducting electrode coupled to said fixed voltage source, and a control electrode coupled to the control electrode of said first transistor; a feedback resistance coupled to the control electrode of said second transistor for feeding back an output of said second transistor to the control electrode of said second transistor; and a variable resistance element for controlling a ratio between a current flowing from the first conducting electrode of said first transistor into the control electrode of said second transistor and said feedback resistance, and a current flowing from the first conducting electrode into the second conducting electrode in said first transistor.