System for the help frequency source locks optimal control voltage point

The utility model discloses a system for the help frequency source locks optimal control voltage point, including digital self-Carlibration module, optimum frequency section selection circuit, locking detection circuitry, R frequency divider, N frequency divider, phase frequency detector and voltage controlled oscillator, the output of R frequency divider respectively with phase frequency detector, digital self-Carlibration module and locking detection circuitry's R_DIV input connection, voltage controlled oscillator's output pass through the N frequency divider respectively with phase frequency detector, digital self-Carlibration module and locking detection circuitry's N_DIV input connection, the locking detection circuitry be connected with digital register through optimum frequency section selection circuit, the output number of pass word register of digital self-Carlibration module and voltage controlled oscillator's input connection, phase frequency detector's output and voltage controlled oscillator's detection circuitry 0 input connection. The utility model discloses make the frequency source circuit after the locking, voltage controlled oscillator's control voltage is optimalizing among all control voltage that contain the voltage controlled oscillator of the frequency section correspondence of target frequency.