Patent ID: 6100738
Filing Date: 2000-08-08
Classification: H03K

Abstract:
A current switch for producing a square wave output current in response to a square wave input signal, said current switch comprising:a. a plurality of terminals including a first input terminal (T1) for receiving the input signal; an output terminal (T2) for producing the square wave output current; first (T3) and second (T4) power supply terminals; and a biasing terminal (T5);b. a first current-switching stage including first (M13) and second (M14) transistors; said first transistor having a first terminal coupled to the biasing terminal, a second terminal coupled to the output terminal, and a third terminal; said second transistor having a first terminal coupled to the first input terminal, a second terminal coupled to the third terminal of the first transistor, and a third terminal coupled to the second power supply terminal;c. a second current-switching stage including third (M23) and fourth (M24) transistors; said third transistor having a first terminal coupled to the first input terminal, a second terminal coupled to the output terminal, and a third terminal; said fourth transistor having a first terminal coupled to the biasing terminal, a second terminal coupled to the third terminal of the third transistor, and a third terminal coupled to the second power supply terminal; andd. a biasing circuit including a current source (I10) for supplying a predetermined current to the biasing terminal and at least one transistor (M11) having first and second terminals coupled to said biasing terminal, and a third terminal coupled to one of said first and second power supply terminals, said at least one transistor forming a current mirror with at least one of said first and fourth transistors.