Patent ID: 7778097
Filing Date: 2010-08-17
Classification: H03F,H03K

Abstract:
1. An integrated circuit device comprising: an amplifier including an amplifier input configured to receive an input signal wherein the amplifier is configured to provide an amplifier output signal at an amplifier output responsive to the input signal received at the amplifier input; a capacitor coupled to the amplifier output; a buffer coupled to the capacitor so that the capacitor is coupled in series between the amplifier output and an input of the buffer, wherein an output of the buffer is coupled to a buffered signal terminal; a variable resistive feedback circuit coupled between the input and output of the buffer wherein the variable resistive feed back circuit provides a variable resistance between the input and output of the buffer; and a feedback resistance controller coupled to the variable resistive feedback circuit wherein the feedback resistance controller is configured to select a first resistance for the variable resistive feedback circuit for a first frequency of the input signal and to select a second resistance for the variable resistive feedback circuit for a second frequency of the input signal different than the first frequency wherein the first and second resistances are different.