Calibration apparatus and method using pulse for frequency, phase, and delay characteristic
View Patent ↗In a device for measuring the properties of a device under test connected by a signal transmission path having reciprocity, a terminal on the device under test side of the signal transmission path is opened; pulse signals are transmitted to a terminal on the measuring apparatus side of the signal transmission path; the transmitted pulse signals are monitored and spectrum analyzed on the measuring apparatus; the pulse signals reflected from a terminal on the device under test side of the signal transmission path are monitored and spectrum analyzed on the measuring apparatus; and the frequency properties of propagation delay of the signal transmission path are found by referring to the coefficient obtained based on the impedance of the resistance load, the spectrum of the transmitted pulse signals, and the spectrum of the reflected pulse signals. The effect of an error is eliminated from the measuring results using the resulting frequency properties or propagation delay in actual measurement.
1. A method for calibrating frequency properties in an apparatus for measuring the properties of a device under test connected by a signal transmission path having reciprocity, said method comprising:
connecting an open circuit as a resistance load to a terminal on the device under test side of the signal transmission path;
transmitting step pulse signals as reference signals to a terminal on the measuring apparatus side of the signal transmission path;
monitoring and analyzing the spectrum of the transmitted reference signals on the measuring apparatus by a Fourier transform;
monitoring and spectrum analyzing, on the measuring apparatus, the reference signals reflected from a terminal on the device under test side of the signal transmission path by a Fourier transform; and
referring to the coefficient obtained based on the impedance of the resistance load, the spectrum of the transmitted reference signals, and the spectrum of the reflected reference signals, and finding the frequency properties of the signal transmission path.
2. A method for calibrating frequency properties in an apparatus for measuring the properties of a device under test connected by a signal transmission path having reciprocity, said method comprising:
connecting an open circuit as a resistance load to a terminal on the device under test side of a signal transmission path;
transmitting step pulse signals as reference signals to a terminal on the measuring apparatus side of a signal transmission path;
monitoring and spectrum analyzing, on the measuring apparatus, the reference signals reflected from a terminal on the device under test side of the signal transmission path by a Fourier transform; and
referring to the coefficient obtained based on the impedance of the resistance load and the spectrum of the reflected reference signals and finding the frequency properties of the signal transmission path.
3. The method cited in claim 2 , further comprising: normalizing the reflected reference signals or spectrum of the reflected reference signals using the amplitude of the transmitted reference signals.