Voltage-controlled oscillator that operates over a wide frequency range

A controllable oscillator circuit arrangement, comprising:

• a comparator unit for comparing voltage potential, fed to a signal input thereof, of a storage element with a first reference voltage potential and a second reference voltage potential;
• a control stage connected to the comparator unit and which, under control of the comparator unit, defines a charging and discharge cycle via a switching unit;
• first and second current mirror units, structured as first and second controlled current sources, for charging and discharging the storage element;
• an adjusting current being fed in via an input of the first current mirror unit and a first output thereof being connected to the storage element and a second output thereof being connected to an input of the second current mirror unit;
• an oscillator frequency of the controllable oscillator being controlled by the adjusting current via the first and second current mirror units;
• an impedance converter having an input connected to the storage unit and having an output connected to the signal input of the comparator unit;
• the second output of the first current mirror unit connected directly to the input of the second current mirror unit, a first output of the second current mirror unit connected to the storage element via the switching unit and a second output of the second current mirror unit connected to the signal input of the comparator unit;
• and
• an emitter of the impedance converter connected to a current source whose output current is proportional to the adjusting current.