Patent ID: 6351185
Filing Date: 2002-02-26
Classification: H03F,H04L

Abstract:
An output stage for a line driver, comprising:a first amplifier comprising a series combination of a first semiconductor device and a second semiconductor device; a second amplifier comprising a series combination of a third semiconductor device and a fourth semiconductor device; a first integrated back-matching resistor network interposed between the first and the second semiconductor devices, wherein the first integrated back-matching resistor network comprises a series combination of integrated resistors having an additive resistance selected to match an expected load input impedance; and a second integrated back-matching resistor network interposed between the third and the fourth semiconductor devices, wherein the second integrated back-matching resistor network comprises a series combination of integrated resistors having an additive resistance selected to emulate an expected line input impedance, wherein the second integrated back-matching resistor network is configured in parallel with the first integrated back-matching resistor network.