| 摘要 |
A shift keyed phase detector having a first input for receiving a signal including data shift keyed modulated on a carrier, such as BPSK, QPSK, MSK, SMSK, etc., and a second input for receiving a reference frequency from a local oscillator, to supply in-phase and quadrature channel data signals at differing phase error angles relative to the local oscillator reference frequency. The in-phase and quadrature channel signals are squared, and the squared signals are summed and filtered to provide a first phase error signal. The in-phase and quadrature channel signals are also multiplied with each other and filtered to provide a second phase error signal. The in-phase and quadrature channel signals are cross-multiplied with each of the phase error signals and then combined to provide a data signal in phase with the original data signal. |
