Circuit assembly for time-discretizing an analog electrical signal

A detection device comprising:

• a sensor unit, which provides an analog electrical sensor signal at a sensor terminal, and
• a circuit assembly for time-discretizing the analog electrical sensor signal, for which purpose an input terminal of the circuit assembly is connected to the sensor terminal of the sensor unit and the circuit assembly is formed to provide a time-discrete sensor signal depending on the analog electrical sensor signal at an output terminal of the circuit assembly,
• the circuit assembly for time-discretizing the analog electrical sensor signal comprises:
• the input terminal for supplying the analog electrical sensor signal,
• the output terminal for providing the time-discrete sensor signal depending on the supplied analog electrical sensor signal, and
• a sample and hold circuit, which comprises:
• a capacitor connected to the output terminal,
• an electronic switching unit connected between the input terminal and the output terminal, and
• a control unit for controlling the switching unit,
• wherein the switching unit is formed to provide an off-state due to an off-signal of the control unit and an on-state due to an on-signal of the control unit,
• the switching unit is configured to provide an electrical resistance in the on-state, wherein the electrical resistance cooperates with the capacitor and comprises a preset resistance value such that the sample and hold circuit acts as a low-pass filter with a preset cut-off frequency, wherein the switching unit comprises a semiconductor switch having a switching path which provides the electrical resistance in the switched on state;
• a switchable electrical energy supply unit for supplying the detection device with electrical energy;
• wherein the energy supply unit is formed to supply at least the sensor unit with electrical energy in a clocked manner;
• wherein the electrical resistance and the capacitor of the sample and hold circuit of the circuit assembly are dimensioned such that a cut-off frequency determined hereby is less than a clock frequency due to clocking of the energy supply by the energy supply unit.

A lighting device comprising:

• an illuminant, and
• a lighting control for controlling the illuminant, characterized by
• a detection device connected to the lighting control, the detection device comprising:
• a sensor unit, which provides an analog electrical sensor signal at a sensor terminal, and
• a circuit assembly for time-discretizing the analog electrical sensor signal, for which purpose an input terminal of the circuit assembly is connected to the sensor terminal of the sensor unit and the circuit assembly is formed to provide a time-discrete sensor signal depending on the analog electrical sensor signal at an output terminal of the circuit assembly,
• the circuit assembly for time-discretizing the analog electrical sensor signal comprises:
• the input terminal for supplying the analog electrical sensor signal,
• the output terminal for providing the time-discrete sensor signal depending on the supplied analog electrical sensor signal, and
• a sample and hold circuit, which comprises:
• a capacitor connected to the output terminal,
• an electronic switching unit connected between the input terminal and the output terminal, and
• a control unit for controlling the switching unit,
• wherein the switching unit is configured to provide an off-state due to an off-signal of the control unit and an on-state due to an on-signal of the control unit,
• the switching unit is configured to provide an electrical resistance in the on-state, wherein the electrical resistance cooperates with the capacitor and comprises a preset resistance value such that the sample and hold circuit acts as a low-pass filter with a preset cut-off frequency, wherein the switching unit comprises a semiconductor switch having a switching path which provides the electrical resistance in the switched on state;
• a switchable electrical energy supply unit for supplying the detection device with electrical energy;
• wherein the energy supply unit is formed to supply at least the sensor unit with electrical energy in a clocked manner;
• wherein the electrical resistance and the capacitor of the sample and hold circuit of the circuit assembly are dimensioned such that a cut-off frequency determined hereby is less than a clock frequency due to clocking of the energy supply by the energy supply unit.