Patent ID: 6667614
Filing Date: 2003-12-23
Classification: B82Y,G01R,G11B

Abstract:
A head testing apparatus for testing an output of a magnetic data recording head, the apparatus comprising:first and second tester input terminals for coupling to the head; a first input stage comprising a first buffer input, which is coupled to the first tester input terminal, a first buffer output and a plurality of parallel-connected buffer amplifiers coupled between the first buffer input and the first buffer output; a second input stage comprising a second buffer input, which is coupled to the second tester input terminal, a second buffer output and a plurality of parallel-connected buffer amplifiers coupled between the second buffer input and the second buffer output; and an AC-coupled differential amplifier having first and second amplifier inputs coupled to the first and second buffer outputs through first and second capacitors, respectively, and having a measurement output.