Patent ID: 7777655
Filing Date: 2010-08-17
Classification: H03F,H03K

Abstract:
1. An apparatus comprising: a first output terminal; a second output terminal; a third output terminal; a fourth output terminal; a first current source; a second current source; a first switch that is coupled between the first and second current sources and the first and second output terminals, wherein the first switch couples the first and second current sources to the first output terminal in a first state, and wherein the first switch couples the first and second current sources to the second output terminal in a second state; a second switch that is coupled between the first and second current sources and the third and fourth output terminals, wherein the second switch couples the first and second current sources to the third output terminal in the first state, and wherein the second switch couples the first and second current sources to the fourth output terminal in the second state; a first buffer having an input and an output, wherein the input of the first buffer is coupled to the first output terminal, and wherein the output of the first buffer is coupled to the fourth output terminal; and a second buffer having an input and an output, wherein the input of the second buffer is coupled to the second output terminal, and wherein the output of the second buffer is coupled to the third output terminal.