Abstract: The voltage controlled oscillator circuit includes a resonant circuit, with two inductive elements (L1, L2) and a variable capacitive element (CV), which is connected to a high potential terminal (VEXT) of a voltage source, and a pair of cross-coupled NMOS transistors (N1, N2), which is connected between two oscillating signal (VA, VB) output terminals of the resonant circuit. Each NMOS transistor of the pair is connected in parallel to a diode mounted NMOS transistor (N3, N4) so as to form a current mirror. An identical current is supplied to each diode mounted transistor in an oscillating signal amplitude regulation loop. Two resistors (R1, R2) series connected between the gates of the transistors of the pair (N1, N2) allow extraction of the common mode voltage to be stored in a filtering capacitor (Cm) in order to bias a reference NMOS transistor (N5) connected to a reference resistor (R3).

Abstract: The voltage controlled oscillator circuit includes a resonant circuit, with two inductive elements (L1, L2) and a variable capacitive element (CV), which is connected to a high potential terminal (VEXT) of a voltage source, and a pair of cross-coupled NMOS transistors (N1, N2), which is connected between two oscillating signal (VA, VB) output terminals of the resonant circuit. Each NMOS transistor of the pair is connected in parallel to a diode mounted NMOS transistor (N3, N4) so as to form a current mirror. An identical current is supplied to each diode mounted transistor in an oscillating signal amplitude regulation loop. Two resistors (R1, R2) series connected between the gates of the transistors of the pair (N1, N2) allow extraction of the common mode voltage to be stored in a filtering capacitor (Cm) in order to bias a reference NMOS transistor (N5) connected to a reference resistor (R3).