An oscillator circuit, comprising: - at least a first supply terminal to apply a first voltage potential (VDDA), - at least a second supply terminal to apply a second voltage potential being different from the first voltage potential (VDDA), - an output terminal (A1, A2) to output an output signal (OUT, OUTB) of the oscillator circuit, - a terminal to apply a reference voltage (VREF), - a capacitor being arranged in a current path between the at least first supply terminal and the at least second supply terminal having a first side (S110a) and a second side (S110b), wherein each of the first and second side (S110a, S110b) of the capacitor is alternately connected to one first and one second supply terminal (VD, VS) in dependence on the output signal (OUT, OUTB) of the oscillator circuit, - a first controllable switch being coupled to the first side (S110a) of the capacitor, and a second controllable switch being coupled to the second side (S110b) of the capacitor, - a first resistor being arranged between the first side (S110a) of the capacitor and the first controllable switch, - a second resistor being arranged between the second side (S110b) of the capacitor and the second controllable switch, - a comparator having a first input terminal (I200a) to apply a first input signal, a second input terminal (I200b) to apply a second input signal (VREF) and an output terminal to generate a comparator output signal (VCFF), - wherein the first input terminal (I200a) of the comparator is alternately connected to the first and the second side (S110a, S110b) of the capacitor in dependence on the output signal (OUT, OUTB) of the oscillator circuit and wherein the second input terminal (I200b) of the comparator is connected to the terminal to apply the reference voltage (VREF), - wherein the comparator is configured to generate the comparator output signal (VCFF) in dependence on the comparing of the first and second input signal (VC, VREF) of the comparator, - wherein the output terminal of the comparator is coupled to the output terminal (A1, A2) of the oscillator, - wherein the first controllable switch is configured to alternately connect the first side (S110a) of the capacitor to one first and one second supply terminal (VD, VS), - wherein the second controllable switch is configured to alternately connect the second side (S110b) of the capacitor to one first and one second supply terminal (VD, VS). - at least a first supply terminal to apply a first voltage potential (VDDA), - at least a second supply terminal to apply a second voltage potential being different from the first voltage potential (VDDA), - an output terminal (A1, A2) to output an output signal (OUT, OUTB) of the oscillator circuit, - a terminal to apply a reference voltage (VREF), - a capacitor being arranged in a current path between the at least first supply terminal and the at least second supply terminal having a first side (S110a) and a second side (S110b), wherein each of the first and second side (S110a, S110b) of the capacitor is alternately connected to one first and one second supply terminal (VD, VS) in dependence on the output signal (OUT, OUTB) of the oscillator circuit, - a first controllable switch being coupled to the first side (S110a) of the capacitor, and a second controllable switch being coupled to the second side (S110b) of the capacitor, - a first resistor being arranged between the first side (S110a) of the capacitor and the first controllable switch, - a second resistor being arranged between the second side (S110b) of the capacitor and the second controllable switch, - a comparator having a first input terminal (I200a) to apply a first input signal, a second input terminal (I200b) to apply a second input signal (VREF) and an output terminal to generate a comparator output signal (VCFF), - wherein the first input terminal (I200a) of the comparator is alternately connected to the first and the second side (S110a, S110b) of the capacitor in dependence on the output signal (OUT, OUTB) of the oscillator circuit and wherein the second input terminal (I200b) of the comparator is connected to the terminal to apply the reference voltage (VREF), - wherein the comparator is configured to generate the comparator output signal (VCFF) in dependence on the comparing of the first and second input signal (VC, VREF) of the comparator, - wherein the output terminal of the comparator is coupled to the output terminal (A1, A2) of the oscillator, - wherein the first controllable switch is configured to alternately connect the first side (S110a) of the capacitor to one first and one second supply terminal (VD, VS), - wherein the second controllable switch is configured to alternately connect the second side (S110b) of the capacitor to one first and one second supply terminal (VD, VS).