Patent ID: 8531238
Filing Date: 2013-09-10
Classification: H03F

Abstract:
1. A method to achieve a fully differential low noise amplifier with controlled common mode voltages suited for amplification of low frequency signals, comprising the following steps: (1) providing a fully differential amplifier having one or more gain stages comprising at least one voltage-to-current converter each comprising an impedance defining the voltage to current ratio, wherein the impedance of the voltage-to-current converter matches load impedances of the one or more gain stages; (2) applying only one polarity of transistors of an IC technology that has the lowest transition frequency between 1/f noise and white noise to achieve a low chopping or autozeroing frequency; (3) deploying load impedances with each gain stage; and (3) adjusting common mode voltages by adjusting currents flowing through said load impedances, wherein the currents flowing through the load impedances are derived from the at least one voltage-to-current converter and wherein no common mode feedback loop is required.