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2Gbit/sec Write Data Speed
1.3GHz Read Amplifier Bandwidth
The Guzik MR Amplifier Revision 5 is a next generation
of the Guzik head amplifiers. The main advantages of
the Guzik MR Amplifier Revision 5 comparing to the Revision
4 are:
- Fast rise/fall time of the write current (300psec
instead of 800psec)
- Programmable overshoot of the write current up
to 100%
- High bandwidth of the read amplifier (1.3GHz
instead of 400MHz)
- Small write to read recovery time (less than 200nsec
comparing to 2µsec)
Read Amplifier
- Differential voltage sense amplifier
- Bandwidth: 1.3GHz at -3dB
- Flatness: ±0.5dB, 0.3
to 1GHz
- Input noise: less than 0.6
 (typical)
- MR Bias current: programmable -10mA
to 10mA in 0.01 mA
steps
- Non-linear distortions (1GHz, 1mV
input level): less than 1%
- Amplification: 30dB*
- Write to read recovery time: less than 200nsec
for both Bias On and Shut Down Bias modes**
- Guzik MR5 Head Amplifier Compatibility: with Universal
Preamplifier UP8 only.
Write Amplifier
- Write data speed: up to 2Gbit/sec
- Rise/fall time of write current: (10-90%)
300psec***
- Programmable overshoot : up to 100%
of write current in 1% steps
- Output common mode voltage: less than ±0.1V
- Write current: programmable 2mA
to 80mA (zero to peak) in 0.02mA
steps****
- Read to write recovery time: less than 40nsec
- Head voltage swing: more than 12V
peak to peak
- Output impedance: 100Ohm differential
* Required amplification is provided
by UP8.
** Measurement conditions: write
current 50mA, head inductance 20nH, and write data 1Gbit/sec.
*** Measurement conditions: write
current 50mA, 100% overshoot, and L=20nH in series with
R=20 Ohm; current probe Tektronix CT-6.
**** Maximum overshoot value
in write current range 50-80mA should be calculated
according with formula I overshoot + I write = 100mA.
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