Patent ID: 7570097
Filing Date: 2009-08-04
Classification: H03K

Abstract:
1. An electronic circuit, comprising a delay circuit that comprises a chain of saw tooth delay stages and correlating circuitry, each saw tooth delay stage comprising an integrating circuit and a current modulator coupled between the integrating circuit and a respective current output of the correlating circuitry, the current modulator of each successive saw tooth delay stage having a reference input and a chained input coupled to an output of the integrating circuit of a preceding saw tooth delay stage in the chain, the correlating circuitry being coupled to the reference input of the current modulator of at least a first one of the saw tooth delay stages, the correlating circuitry being arranged to generate a current from at least one of the current outputs and a reference voltage at the reference input of said first one of the saw tooth delay stages at least partly from a common reference.