Circuit arrangement for voltage selection, and method for operating a circuit arrangement for voltage selection

A circuit arrangement for voltage selection, comprising:

• a first input configured to receive a first supply voltage;
• a second input configured to receive a second supply voltage;
• an output configured to provide an output voltage;
• a first transistor connected between the first input and the output, and comprising a substrate connection connected to a supply connection of the arrangement;
• a second transistor connected between the second input and the output, and comprising a substrate connection connected to the supply connection;
• a third transistor connected between the first input and the supply connection;
• a fourth transistor connected between the second input and the supply connection;
• and
• a control circuit comprising inputs coupled to the first input and the second input, respectively, and to the supply connection, and comprising outputs coupled to a control connection of the first transistor and to a control connection of the second transistor, respectively;
• wherein the third transistor comprises a control connection connected to the second input of the circuit arrangement and the fourth transistor comprises a control connection connected to the first input of the circuit arrangement.

A circuit arrangement for voltage selection, comprising:

• a first and a second transistor configured to selectively supply a first supply voltage or a second supply voltage, respectively, to an output;
• a third and a fourth transistor configured to supply the first supply voltage or the second supply voltage to a supply connection that is connected to a substrate connection of the first transistor and to a substrate connection of the second transistor;
• a control circuit configured to supply a first control signal to a control connection of the first transistor, and a second control signal to a control connection of the second transistor based on a comparison between the first supply voltage and the second supply voltage;
• a fifth transistor configured to supply the first supply voltage to the supply connection based on the first control signal;
• and
• a sixth transistor configured to supply the second supply voltage to the supply connection based on the second control signal.

A method for operating a circuit arrangement for voltage selection, comprising:

• comparing a first supply voltage with a second supply voltage, and supplying a first control signal to a control connection of a first transistor and a second control signal to a control connection of a second transistor based on a comparison result;
• supplying the first supply voltage via the first transistor or the second supply voltage via the second transistor to an output based on the first and second control signals;
• supplying a substrate voltage based on the first supply voltage using a third transistor and based on the second supply voltage using a fourth transistor;
• supplying the substrate voltage to a substrate connection of the first transistor and to a substrate connection of the second transistor;
• and
• wherein a control connection of the third transistor is connected to the second input of the circuit arrangement and a control connection of the fourth transistor is connected to the first input of the circuit arrangement.