Patent ID: 7737730

Claim:
An integrated circuit, comprising: a first switched capacitor element; a second switched capacitor element; the first switched capacitor element and the second switched capacitor element being coupled to form a bridge circuit, the first switched capacitor element being located in a first branch of the bridge circuit, and the second switched capacitor element being located in a second branch of the bridge circuit; a detector circuit coupled to the first branch and to the second branch of the bridge circuit; and a clock signal input is coupled to the first switched capacitor element and to the second switched capacitor element to obtain switching signals of the first switched capacitor element and of the second switched capacitor element based on an input clock signal applied to the clock signal input, wherein the detector is configured to discriminate between at least a first frequency of the input clock signal and a second frequency of the input clock signal and to generate a corresponding frequency information signal, and the frequency information signal is based on a first voltage level in the first branch of the bridge circuit and a second voltage level in the second branch of the bridge circuit.