摘要 |
A circuit for establishing the input impedance of an amplifier includes an amplifier (12), a circuit component (14), a first feedback resistor (18), and a second feedback resistor (20). The amplifier has an input impedance (26) and is coupled to a load (72) having a load impedance. The circuit component (14) is coupled to the load (72) and shares at least a portion of a bias current (24) with the amplifier (12). The first feedback resistor (18) is coupled to the amplifier (12) and the load (72), and has a first impedance (ZF1). The second feedback resistor (20) is coupled to the amplifier (12) and has a second impedance (ZF2). The input impedance (26) of the amplifier is established based at least in part upon the first impedance (ZF1) and the second impedance (ZF2). |