On-wafer single contact quadrature accuracy measurement using receiver mode in four-port vector network analyzer

This paper presents the calibration procedure using a five-port calibration kit based on receiver mode in vector network analyzer (VNA). After de-embedding the phase/amplitude errors from cal-kit, the quadrature phase accuracy and amplitude error of a quadrature voltage controlled oscillator (QVCO) can be directly obtained using on-wafer testing with a single contact. A 5 GHz QVCO was tested to demonstrate the feasibility of measurement. The I/Q mismatch on both phase and amplitude of the QVCO were precisely measured. Only single probe contact is required during the measurement that minimizes the uncertainty.