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A major problem for crack or electromagnetic property measurement in eddy current detection technique is the lift-off effect. The nonzero value of lift-off distance tends to smear out the discontinuity in the detected signal, causing errors detection. The paper shows the test results of lift-off effect in normalized impedance plane. Curves are transformed to Hough plane by Hough transform and consequently...
This paper described the design of a broadband LNA for TV tuner. The LNA uses two stage structures to achieve trade off of output impedance match and gain. In order to reduce the NF of the amplifier, noise canceling principle is adopted to cancel the noise. The simulation result shows that, in operation bandwidth 48 MHz~860 MHz, the gain is 24 dB, Noise figure is 3 dB, input impedance and output impedance...
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