Patent ID: 8155240

Claim:
A receiver circuit, which has a demodulator for demodulation of a frequency-shift-keyed signal, the demodulator comprising: a first transmission element that has an arctangent function for converting an in-phase signal and a quadrature signal into a phase signal; a subtractor having a second input connected to an output of the first transmission element; a second transmission element; a first proportional element; a first integrator; a second proportional element; and a second integrator connected to the second proportional element; an adder connected to the second integrator; wherein the second transmission element is connected to the subtractor, to at least the first proportional element and one output of the demodulator, and has a nonlinear transfer function, wherein the first proportional element is connected to the adder, wherein the first integrator is connected to the adder and a first input of the subtractor, and wherein the output of the demodulator is connected to an evaluation circuit.