Phase amplitude detection device with high stability and high precision

The invention discloses a phase amplitude detection device with high stability and high precision. The device can be used in an extension set of an accelerator phase amplitude stable system and also can be used as a high-precision phase meter and a high-precision detector. The phase amplitude detection device is formed by a filter, a transformer, a numerical control amplifier, an analog-digital converter, a digital processing unit, a power supply and other components. The numerical control amplifier is controlled by the digital processing unit to enable the analog-digital converter to operate at the optimum sampled signal amplitude and to carry out digital sampling, phase-locked loops, digital down conversion (DDC), digital phase demodulation detection and other signal processing algorithms are conducted on digital signals, and then digital information such as phase differences and amplitudes is obtained. The phase amplitude detection device has the advantages of being high in precision, temperature stability, consistency, reliability and the like, and is especially suitable for the accelerator phase amplitude stable system or the high-precision phase meter or the high-precision detector.