Patent ID: 8717083
Filing Date: 2014-05-06
Classification: H03F

Abstract:
1. A method comprising: receiving an input signal; amplifying the input signal to generate an output signal using a cascade of a plurality of amplifier stages including a first amplifier stage and a last amplifier stage; generating a voltage signal by sensing the output signal in a noninvasive manner so that the sensing results in substantially no change to the output signal; generating a current signal from the voltage signal using a transconductance amplifier; and injecting the current signal into an output node of the first amplifier stage in a noninvasive manner so that the injecting results in substantially no change to an amplification function of the first amplifier stage, wherein injecting the current signal into an output node of the first amplifier stage in a noninvasive manner comprises coupling to the output node of the first amplifier stage via a resistor of resistance substantially higher than an output impedance of the first amplifier stage.