Patent ID: 7425863

Claim:
A low pass filter, comprising: a first stage including a first switchable resistor bank, the first gain stage having an input coupled to the first switchable resistor bank, and a first feedback capacitor, wherein the first feedback capacitor is coupled between the input of the first gain stage and an output of the first gain stage; a boost stage including a second switchable resistor bank coupled to the output of the first gain stage; a second stage coupled to the boost stage including a third switchable resistor bank, the second gain stage having an input coupled to the third switchable resistor bank, and a second feedback capacitor, wherein the second feedback capacitor is coupled between the second switchable resistor bank and an output of the second gain stage; and a third stage coupled to the boost stage including a fourth switchable resistor bank, the third gain stage having an input coupled to the fourth switchable resistor bank, and a third feedback capacitor, wherein the third feedback capacitor is coupled between the fourth switchable resistor bank and an output of the third gain stage and to the second switchable resistor bank.