An electronic system comprises a first and a second oscillator that are mutually cross-coupled and have one and the same resonant frequency, each oscillator comprising an electrical resonator, an active cell having a negative small-signal resistance linked to the electrical resonator, an electric power supply terminal of the active cell, an output for an oscillation signal and a terminal for connection to a ground point, wherein: the electric power supply terminal of the second oscillator and the terminal for connection to a ground point of the first oscillator are linked to one and the same point, termed dynamic ground; and the system also comprises a differential amplifier forming, with the active cell of one of the oscillators, a feedback loop designed to keep the potential of the dynamic ground point at a constant level, dependent on the reference voltage.