Patent ID: 6504354
Filing Date: 2003-01-07
Classification: G01R,H03B

Abstract:
A signal analysis apparatus provided with a YTO, which has the YTO, receives an input signal, mixes the input signal and an oscillation frequency of said YTO, extracts an intermediate frequency signal, and analyzes said input signal over a desired frequency range, said signal analysis apparatus comprising:a current drive circuit for supplying a current corresponding to the oscillation frequency of the YTO; sweep control means for supplying a current to said YTO from said current drive circuit in such a manner that frequencies corresponding to a first range in the oscillation frequency of said YTO designated as said desired frequency range for analysis with one sweep, and a second range designated as a frequency range higher than said first range for the analysis with the next one sweep are oscillated by said YTO, and for generating an instruction signal for increasing the current flowing through said YTO over a part of a period between an end of said first range and a start of said second range in order to shorten the period between the end of said first range and the start of said second range when it is detected that a difference between an end frequency of said first range and a start frequency of said second range is larger than a predetermined frequency difference; and a bias circuit for receiving the instruction signal from said sweep control means and forming a bias for increasing the current from said current drive circuit.