Patent ID: 6147828
Filing Date: 2000-11-14
Classification: G11B

Abstract:
A circuit for processing an analog output signal from a read head having a nonlinear transfer function, said circuit comprising:a nonlinearity correction circuit which has an input coupled to receive the analog output signal and which is operative to generate a corrected analog signal by adjusting the analog output signal to reduce a nonlinearity introduced by the read head; said nonlinearity correction circuit including an asymmetry compensation circuit which has an input coupled to receive the analog output signal and which is operative to generate an analog compensation signal representative of the nonlinearity introduced by the read head, and including circuitry operative to combine the analog compensation signal with the analog output signal to obtain the corrected analog signal;wherein said asymmetry compensation circuit includes a variable gain amplifier having an input responsive to the analog output signal and having a gain determined by a gain signal; wherein said circuitry operative to combine is a portion of said variable gain amplifier.