US Patent 7944290 Trans-impedance amplifier

Systems and apparatus for converting an input current signal into two or more output voltage signals on an integrated circuit. In one aspect, an integrated circuit includes a first trans-impedance amplifier that includes a first cascode amplifier; and a second trans-impedance amplifier that includes a second cascode amplifier, the second cascode amplifier and the first cascode amplifier sharing an input transistive element; where the first cascode amplifier is coupled to one or more first switches that disable the first trans-impedance amplifier, the second cascode amplifier is coupled to one or more second switches that disable the second trans-impedance amplifier, and control logic coupled to the one or more first switches and the one or more second switches disables at least one of the first trans-impedance amplifier or the second trans-impedance amplifier.