Abstract: An assembly of electronic components for reception of data using an optical fibre wherein said assembly comprises: a photodiode; a first amplifier coupled to said photodiode; a second amplifier, whose electrical behaviour is substantially identical to an electrical behaviour of said first amplifier; an impedance network comprising at least two electronic components coupled between an input of said second amplifier and a reference terminal, wherein those at least two electronic components comprise at least two impedance elements, one impedance element being capacitive and another being resistive or inductive, and wherein said at least two electronic components are adjustable under electronic control to adjust the impedance presented by said impedance network; and circuitry for creating a signal formed from a subtraction of outputs of the first and second amplifiers.

Abstract: The present invention provides a current mirror circuit for matching current between two LEDs. The current mirror circuit includes a first sub-circuit, including a first transistor, a second transistor, and a first OPAMP, and a second sub-circuit including a third transistor, a fourth transistor, and a second OPAMP. The first sub-circuit is connected to a first LED and the second sub-circuit is connected to a second LED. The current mirror circuit also includes four switches which continuously switch the currents flowing through the first LED and the second LED to maintain a same average current through both the LEDs. This way, better current matching is achieved than possible using conventional current mirror circuits. The frequency of switching of currents is kept above the flicker perception of human eye, so that a person viewing the LEDs is unable to detect any changes in the illumination of the LEDs.