Electronic circuit testing method and device

A test device, comprising:

• a signal source configured to apply a first signal between two terminals of a circuit, the circuit being powered off;
• and
• a radio frequency wave detector configured to verify whether radio frequency waves transmitted by the circuit correspond to an expected transmission, wherein the radio frequency wave detector is configured to:
• capture said radio frequency waves simultaneously with the signal source applying the first signal;
• deduce a radio frequency signature of the circuit from the radio frequency waves captured;
• and
• verify whether a radio frequency signature corresponds to a reference signature, wherein the first signal has a plurality of selected frequencies, and wherein, for each selected frequency:
• the radio frequency signature comprises a respective first value and the reference signature comprises a respective second value;
• and
• the radio frequency wave detector is configured to verify whether the radio frequency signature corresponds to the reference signature comprises by comparing with a threshold a difference in absolute value between the respective first value and the respective second value.

A method, comprising testing a first circuit, the testing including:

• applying a first signal to a first circuit while the first circuit is off;
• and
• verifying whether radio frequency waves transmitted by the first circuit, in response to applying the first signal, correspond to an expected transmission, wherein:
• the verifying comprises:
• capturing said radio frequency waves in response to applying the first signal,
• deducing a radio frequency signature of the circuit from the radio frequency waves captured, and
• verifying whether said radio frequency signature corresponds to a reference signature;
• the first signal has a plurality of selected frequencies;
• and
• for each selected frequency:
• the radio frequency signature comprises a respective first value and the reference signature comprises a respective second value;
• and
• verifying whether said radio frequency signature corresponds to the reference signature comprises comparing with a threshold a difference in absolute value between the respective first value and the respective second value.