Patent ID: 6133742
Filing Date: 2000-10-17
Classification: G01N,G01Q,G01R

Abstract:
An apparatus for measuring a sample waveform in a signal line proximate to a surface of a sample, the sample waveform having a sample repetition rate, the apparatus comprising:a cantilever disposed near and spaced apart from the surface of the sample such that the cantilever is capacitively coupled to the signal line;a composite probe waveform generator to generate a composite probe waveform coupled to be received by the cantilever, the composite probe waveform having first and second probe waveform components, the first and second probe waveform components to be modulated at first and second modulation frequencies, respectively, the first and second probe waveform components having first and second probe repetition rates substantially equal to the sample repetition rate, the first and second modulation frequencies substantially less than the sample repetition rate; anda motion detector coupled to the cantilever, the motion detector to detect a motion of the cantilever.