Delay-locked loop circuit in spread spectrum receiver

Spread spectrum receiver including a terminal for a received spread spectrum signal and a delay locked loop circuit for holding the synchronization of a despread signal with the received spread spectrum signal, the circuit comprising:

• a voltage control oscillator for generating a clock signal;
• a despread signal generator controlled by said clock signal for generating a first despread signal and second despread signal, the first despread signal being shifted in phase by one bit to the second despread signal;
• first correlation means for producing a first signal representative of a correlation of the received spread spectrum signal with the first despread signal;
• second correlation means for generating a second signal representative of a correlation of the received spread spectrum signal with the second despread signal;
• a subtracter for generating a signal representative of a subtraction between said first and second correlation representative signals;
• a positive feedback amplifier for amplifying said subtraction representative signal which is applied to said voltage control oscillator as a control signal;
• and
• a window comparator with a predetermined window width for in response to the subtraction representative signal for producing a lock signal when the subtraction representative signal is positioned within the window width and an unlock signal when outside the window width.