Electrical circuit

An electrical circuit configured as a transimpedance amplifier stage, comprising:

• an input node,
• an output node,
• at least one signal amplifier which comprises at least one output connection and
• at least one input connection or at least one pair of differential input connections, wherein an input signal applied to the at least one input connection or the at least one pair of differential input connections is converted into a multiple amplified output signal emitted at the at least one output connection, wherein the at least one output connection is connected to or connectable to the output node directly or via at least one further component, and wherein the at least one input connection or the at least one pair of differential input connections is connected to or connectable to the input node directly or via at least one further component, wherein, in a case of an individual input connection of the at least one input connection a reference potential of a signal amplifier or, in a case of a pair of differential input connections of the at least one pair of differential input connections a potential of an other input connection which is not connected or cannot be connected to the input node is a first reference potential,
• at least one feedback element which is connected to or connectable to the input node with a first connection directly or via at least one further component, and is connected to or connectable to the output node with a second connection directly or via at least one further component,
• at least one further signal amplifier which comprises at least one further output connection and at least one further input connection or at least one further pair of differential input connections, wherein an input signal applied to the at least one further input connection is converted into a multiple amplified output signal emitted at the at least one further output connection, wherein the at least one further output connection is connected to a second switch directly or via at least one further component and at least one further input connection is connected to the output node directly or via at least one further component, wherein, in a case of an individual further input connection of the at least one further input connection, a reference potential of a further signal amplifier or, in a case of a further pair of differential input connections of the at least one pair of differential input connections, a potential of an other further input connection which is not connected or cannot be connected to the output node is referred to as a second reference potential,
• at least one second switch through which the further output connection is connectable to the input node directly or via at least one further component,
• at least one current limiting component connected in series to the at least one second switch, wherein the at least one current limiting component has a current transfer characteristic through which substantially no current flows when a voltage applied to the at least one current limiting component is small, but in a case of a larger voltage, a current flows which is larger by more than a ratio of the voltage and the larger voltage,
• whereby the at least one current limiting component minimizes interference effects of at least one first switch and/or the at least one second switch,
• wherein the at least one second switch is controllable by electrical control signals, wherein the electrical circuit has a control device for controlling the switching of the at least one second switch,
• wherein the control device is configured in a first operating mode for switching the at least one second switch into a switching position in which an input current flowing into the input node is converted into an amplified, integrated or other dependent output signal voltage at the output node of the electrical circuit, and wherein the control device is configured in a second operating mode for switching the at least one second switch to a switching position by which the feedback element is actively controlled to a neutral state, wherein the at least one signal amplifier compensates for voltage drops at the at least one second switch and other components located in a discharge path during the second operating mode by a high amplification factor of the at least one signal amplifier, and
• wherein the electrical circuit is operated in the first operating mode more than in the second operating mode.