Patent ID: 6486711
Filing Date: 2002-11-26
Classification: G11C,H03G

Abstract:
A programmable gain amplifier, comprising:a sampling impedance, wherein the sampling impedance includes a first variable capacitor; a gain element having an input and an output, the coupled to the sampling impedance, the gain element has an exponential gain characteristic of function: G(x)=(1+x)/(1âˆ’x)=1+2x/(1âˆ’x) â€ƒwhere âˆ’0.7a feedback impedance coupled between the input and the output, wherein the feedback impedance includes a second and third capacitor coupled in parallel, wherein the second capacitor is a variable capacitor equal to x/2 times the value of the third capacitor and the first variable capacitor is equal to x times the value of the third capacitor, where âˆ’0.7