Patent ID: 7088160

Claim:
A circuit arrangement for regulating a parameter of an electrical signal, the circuit arrangement comprising: a circuit component for generating an electrical output signal having an electrical parameter which is to be regulated, and a regulating device including: a first integrator for receiving the electrical output signal from the circuit component, and for producing a first output signal, and a second integrator connected to receive the first output signal from the first integrator, wherein the second integrator comprises an operational amplifier having an inverting input terminal, a noninverting input terminal and an output terminal, wherein the output terminal is connected to the inverting input terminal via a feedback path, wherein the inverting input terminal is connected to receive the first output signal from the first integrator, wherein the noninverting input terminal is connected to receive a reference signal representing a nominal value, wherein the output terminal of the operational amplifier is fed back to the inverting input terminal in the feedback path via a series circuit comprising a capacitor and a resistor, wherein the output terminal of the operational amplifier provides a second output signal from the regulating device, wherein the second output signal from the regulating device is supplied to the circuit component as a controlled variable, and wherein the circuit component comprises a differential stage which produces a digital output signal having a duty cycle that is regulated by the second output signal generated by the circuit arrangement.