Patent ID: 6917316
Filing Date: 2005-07-12
Classification: H03M

Abstract:
1. An integrated circuit for adjusting the gain of a digital-to-analog converter comprising: a secondary digital-to-analog converter receiving a digital input value and producing an analog signal having current corresponding to said digital input value; a first current mirror circuit coupled to said secondary digital-to-analog converter and producing matching first and second current outputs corresponding to said analog signal, said first current output providing a current gain adjustment signal for said digital-to-analog converter; a second current mirror circuit coupled to said first current mirror circuit and producing a current output matching said second current output of said first current mirror circuit; and a resistor coupled to said current output of said second current mirror circuit and providing a voltage gain adjustment signal for said digital-to-analog converter; wherein, said current gain adjustment signal and said voltage gain adjustment signal are determined by said integrated circuit without external resistors.