Patent ID: 8767876

Claim:
An electronic signal modulator ( 400 ), comprising: a pulse-shaping filter ( 102 ) that receives a digital modulation data signal; a high-pass pre-emphasis filter ( 104 ); a phase-locked loop (PLL) ( 110 ) that generates a carrier signal modulated by the digital modulation data signal, wherein the PLL has a low-pass frequency response to be compensated by a frequency response of the pre-emphasis filter; a sequence detector ( 402 ) configured to detect a sequence of bits of the digital modulation data signal that are the same, wherein the sequence has a length of at least a number N of bits, and the sequence detector generates an output signal based on a sequence detected; an offset compensator ( 404 ) responsive to the output signal of the sequence detector and configured to add a compensation value to an output of the pre-emphasis filter; and a summer ( 406 , 106 ) configured for receiving the output of the pre-emphasis filter and the compensation value and for generating a control signal applied to the PLL.