A differential transimpedance amplifier circuit comprises a first operational amplifier having a first inverting input, a first non-inverting input, a first inverting output and a first non-inverting output. A second operational amplifier has a second inverting input, a second non-inverting input, a...http://www.google.de/patents/US7616057?utm_source=gb-gplus-sharePatent US7616057 - Nested transimpedance amplifier
