Differential Signal Circuit With Current Mirror Transistors
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
The circuit of the drawing produces a binary valued voltage at a terminal Out according to the difference between the signals at its input terminals A and B. Terminals A and B are connected to a current source I1 through identical branches formed by transistors T1 to T4 that are connected as diodes. When the voltag terminal A is higher than the voltage at terminal B, the two diodes in the branch of terminal B are reverse biased, and all of the current from source I1 flows in the branch of terminal A. Conversely, when the voltage of terminal B is higher, no current flows in the branch of terminal A.