Patent ID: 6363034
Filing Date: 2002-03-26
Classification: G01H,H03D

Abstract:
An apparatus for phase angle demodulation comprising a first phase angle demodulator, a second phase angle demodulator, and a processor, and wherein:the first phase angle demodulator comprises a first signal input, a first reference input and a first demodulator output configured to outputs a first output signal; the second phase angle demodulator comprises a second signal input, a second reference input and a second demodulator output configured to output a second output signal; and wherein: the first demodulator output and the second demodulator output are connected to the processor; a phase modulated signal having a carrier frequency and a phase modulation is connected to the first signal input and the second signal input; a first reference signal having a first reference signal frequency is connected to the first reference input; a second reference signal having a second reference signal frequency is connected to the second reference input; at least one of the first reference signal frequency or the second reference signal frequency is different from the carrier frequency; and the processor combines and filters the first and second output signals from the first and second phase angle demodulators in order to derive a phase demodulated signal.