System for the correction of the phase error of two in-phase and quadrature signals, corresponding device and method

摘要

A system for correction of the phase error in in-phase and quadrature signals may include a first signal and a second signal. The system includes a first circuit and a second circuit, each circuit configured for receiving a square-wave input signal and supplying a respective square-wave output signal. The output signal is delayed with respect to the input signal and each circuit is configured in such a way that the propagation delay of a rising edge and the propagation delay of a falling edge between the input signal and the output signal are configurable. The first circuit is configured for receiving the first signal, and the second circuit is configured for receiving the second signal.

主权项

1. A system for correction of phase error in first and second square-wave input signals, the system comprising:
a first circuit configured to receive the first square-wave input signal; and a second circuit configured to receive the second square-wave input signal, each of said first and second circuits configured to
receive a respective one of the first and second square-wave input signals,supply a square-wave output signal, the square-wave output signal being delayed with respect to the respective one of the first and second square-wave input signals, andgenerate a configurable propagation delay of a rising edge, and a configurable propagation delay of a falling edge between the respective one of the first and second square-wave input signals and the square-wave output signal; and a control circuit configured to
detect a duty cycle in the square-wave output signal of said second circuit,jointly set the configurable propagation delay of the rising edge and the configurable propagation delay of the falling edge of said second circuit as a function of the duty cycle,detect a phase shift between the square-wave output signal of said first circuit and the square-wave output signal of said second circuit, andset the configurable propagation delay of the rising edge and the configurable propagation delay of the falling edge of said first circuit as a function of the phase shift by at least
correcting a difference between rising edges of the square-wave output signals of said first and second circuits, acting on the square-wave output signal of said first circuit without modifying a difference between falling edges of the square-wave output signals of said first and second circuits, andcorrecting a difference between falling edges of the square-wave output signals of said first and second circuits, acting on the square-wave output signal of said first circuit without modifying a difference between rising edges of the square-wave output signals of said first and second circuits.