Fast-acting Costas loop

Details Fast-acting Costas loop Fast-acting Costas loop

1999-06-25

2000-09-19

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375329, 375308, H04L 2714, H04L 2716, H04L 2722

Patent

active

06122328&

ABSTRACT:
A system and method using a Costas loop to effect accelerated convergence with minimal system complexity. The system comprises an in-phase-limiter and a quadrature-phase limiter, operatively coupled to an EXCLUSIVE-OR gate, for exclusively-ORing an in-phase-sign signal and a quadrature-phase-sign signal to output a first error signal, responsive to the signals having same signs, or a second error signal, responsive to the signals having different signs. An AGC circuit, operatively coupled to an output of the EXCLUSIVE-OR gate, increases and decreases a voltage level of an AGC signal responsive to two consecutive first or second error signals and consecutive dissimilar error signals, respectively. A voltage-controlled oscillator, operatively coupled to an output of the AGC circuit and responsive to the increased or decreased voltage level, changes the frequency of a voltage-controlled-oscillator output signal.

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