A power supply circuit module for a Time to Digital Converter, or TDC, comprising: - a first input for receiving a control signal (Vref); - a second input for receiving a power supply voltage (Vdd); - an output configured to be connected to the power supply input of said TDC, said power supply circuit module being configured to deliver to said TDC a nominal power supply voltage value (Vnom) substantially dependent on said control signal (Vref); characterised in that said power supply circuit module comprises: - an active main power supply device having its own output connected to said output, said active main power supply device being configured to receive said control signal (Vref) at the input and to contribute on the value of the power supply voltage resulting at said output by a voltage value lower than a first predefined percentage with respect to said nominal power supply voltage (Vnom), under the conditions of nominal current absorption; - a number N of active secondary power supply devices configured to receive said control signal (Vref) at the input, each of said active secondary power supply devices having its own output connected in common with the outputs of the remaining N-1 active secondary power supply devices and with said output of said active main power supply device by means of a switch device, each of said active secondary power supply devices being configured to contribute on the value of the power supply voltage resulting at said output by a percentage different from the remaining active secondary power supply devices and all said active secondary power supply devices being configured as a whole to contribute on the value of said power supply voltage resulting at said output by a second predefined percentage of the value of said nominal power supply voltage (Vnom), under the conditions of nominal current absorption, said second predefined percentage being variable between zero and substantially twice said first predefined percentage, said second predefined percentage being determined by activating and/or deactivating each of said active secondary power supply devices by means of the respective switch device. - a first input for receiving a control signal (Vref); - a second input for receiving a power supply voltage (Vdd); - an output configured to be connected to the power supply input of said TDC, - an active main power supply device having its own output connected to said output, said active main power supply device being configured to receive said control signal (Vref) at the input and to contribute on the value of the power supply voltage resulting at said output by a voltage value lower than a first predefined percentage with respect to said nominal power supply voltage (Vnom), under the conditions of nominal current absorption; - a number N of active secondary power supply devices configured to receive said control signal (Vref) at the input, each of said active secondary power supply devices having its own output connected in common with the outputs of the remaining N-1 active secondary power supply devices and with said output of said active main power supply device by means of a switch device, each of said active secondary power supply devices being configured to contribute on the value of the power supply voltage resulting at said output by a percentage different from the remaining active secondary power supply devices and all said active secondary power supply devices being configured as a whole to contribute on the value of said power supply voltage resulting at said output by a second predefined percentage of the value of said nominal power supply voltage (Vnom), under the conditions of nominal current absorption, said second predefined percentage being variable between zero and substantially twice said first predefined percentage, said second predefined percentage being determined by activating and/or deactivating each of said active secondary power supply devices by means of the respective switch device.