Patent ID: 8346841

Claim:
A synchronization sub-circuit for a cross-correlation circuit utilizing event-based sampling, comprising a switch having first and second input terminals for receiving first and second input signals to be cross-correlated, a control terminal and an output terminal; an integrator having an input terminal connected to the output terminal of the switch, and an output terminal providing an output signal; and a hysteretic comparator having an input terminal connected to the output terminal of the integrator, and an output terminal providing an output signal that switches between a first state and a second state in response to the output signal of the integrator, and wherein the output terminal of the hysteretic comparator is connected to the control terminal of the switch causing the switch to alternately relay the first and the second signals to the integrator input terminal with an alternation occurring in response to each transition of the output signal of the hysteretic comparator between the first and the second state.