초록 ▼

A circuit for measuring the relative phase of two periodic signals. Two analog waveforms are applied to limiting amplifiers which provide digital output signals. The output signals therefrom are applied to digital circuitry which provides an analog voltage representative of the phase difference betw

A circuit for measuring the relative phase of two periodic signals. Two analog waveforms are applied to limiting amplifiers which provide digital output signals. The output signals therefrom are applied to digital circuitry which provides an analog voltage representative of the phase difference between the two input signals over a 360 degree range. The digital circuitry compensates for any offset errors which may be introduced by the limiting amplifiers.

대표청구항 ▼

A circuit for measuring a phase difference between two periodic digital input signals and for providing an output representation of the phase difference therebetween without errors caused by asymmetrical timing offset errors in the digital waveforms, comprising: phase means for exclusive-orring the

A circuit for measuring a phase difference between two periodic digital input signals and for providing an output representation of the phase difference therebetween without errors caused by asymmetrical timing offset errors in the digital waveforms, comprising: phase means for exclusive-orring the input signals to provide a pulse-width-modulated output signal representative of the magnitude of the phase difference; sign means responsive to transitions in the input signals for providing an output signal representative of the sign of the phase difference; output means responsive to the phase means output signal and to the sign means output signal for providing an output representation of the phase difference such that error caused by offset of the input signals is eliminated.