Amplifiers – With plural amplifier channels – Amplifying different frequencies in different channels
Patent
1993-03-26
1994-10-18
Mullins, James B.
Amplifiers
With plural amplifier channels
Amplifying different frequencies in different channels
330306, 307520, 328127, H03F 368
Patent
active
053572084
ABSTRACT:
An integrated circuit is disclosed that includes a biquadratic filter in which the poles and zeroes are independently adjustable. The transfer function of the filter has a pair of zeroes in the numerator and a pair of complex conjugate poles in the denominator. The integrated circuit includes a first circuit for constructing the complex conjugate poles of the filter transfer function. The first circuit has an input port for receiving an input signal and an output port at which an output current representative of a filtered output signal is presented. The integrated circuit includes a second circuit for constructing, independently of the poles, the zeroes of the filter transfer function. The second circuit has an input port coupled to the input port of the first circuit for receiving the input signal. The second circuit includes a differentiator for differentiating the input signal to produce a differentiated input signal. The second circuit provides an output current that is proportional to the differentiated input signal. The output current from the second circuit is summed with the output current of the first circuit to produce the filtered output signal. Disk drive controllers that utilize integrated circuits including this technique have the advantage of using a single filter over the entire frequency range with the flexibility of independently varying poles and zeroes of the filter. The biquadratic filter is particularly useful in systems that have a variable rate of encoding digital information so as to record data in a constant bit density.
AT&T Bell Laboratories
Dudek Jim
Mullins James B.
Smith David L.
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