8 Gbit/s Read-Write Analyzer RWA 4000
Works with GSA 6000 series digital signal analyzers
- Up to 8 Gbit/s maximum write data rate (RWA 4008 model)
- Pattern Generator with 1psec resolution of bit precompensation
- Universal servo decoder supports both Guzik servo and Hard Drive servo formats from all major hard drive manufacturers, including Chevron DTR servo
- PRML Chip integration using a daughter card with easy access through front panel
- Acoustic Emission sensor and Embedded HGA Contact sensor digitizing channels for TFC Touchdown detection
- All-digital low-pass filters
- Fast 120MByte/s PCI Express connection to host computer
- Space-saving 81mm low-profile package with reduced power consumption
RWA 4000 Read-Write Analyzer is a part of the new generation all-digital Guzik 4000 Series test systems. RWA 4000 requires Guzik signal analyzer GSA 6000 series to provide a complete RWA solution for magnetic recording test applications.
The RWA 4000 Read-Write Analyzer incorporates the following modules:
Write channel, including Pattern Generator and Frequency Synthesizer modules
The RWA 4000 connects to the host computer via PCI Express 1x cable connection delivering 120 MByte/s sustained data transfer rates for faster operation.
The RWA 4000 comes in space-saving low-profile package with reduced power consumption. Optional 19-inch rack-mount installation kit is available.
RWA 4000 write channel includes a Pattern Generator and a Frequency Synthesizer module capable of writing patterns up to 8 Gbit/s in RWA 4008 model. Patterns are programmable – user-defined bit sequences can be loaded to pattern generator. One of the distinctive features of Guzik pattern generators is bit precompensation1 with 1psec resolution.
1 US Patent 6,760,171
Servo channel includes the universal all-digital servo decoder. The decoder seamlessly supports both Guzik servo and Hard Disk Drive servo; switching between these two modes is done programmatically. The decoder is FPGA-based, which does not require a commercial PRML channel chip to decode hard drive servo, which makes it very flexible to support all major hard drive manufacturer servo formats including Chevron DTR servo.
PRML Channel is arranged as a PRML Chip Adapter daughter card, accessible through RWA front panel. The card integrates a commercial PRML channel IC. Guzik integrates PRML channels from leading manufacturers upon request.
Programmable filter matrix of five low-pass anti-aliasing filters with cutoff frequencies up to 5.5 GHz to provide data decimation for the data rates less than 8 GBit/s. Unlike previous generation of Guzik RWA 2000 and 3000 DTR series, you do not need to purchase filter or differentiator plug-in boards. Programmable filters of filter matrix combined with digital filters of GSA 6000 allow you to set any cut-off frequency of read channel.
AE and ECS Inputs
The RWA 4000 has two integrated low-frequency digitizing channels for processing signals from the following sensors:
Acoustic Emission sensor (sensor on the cartridge), and/or
Embedded Contact sensor (sensor on HGA).
The RWA 4000 system does not require an external digitizer box, such as PicoScope.
The RWA Systems 4000 Series support UP11 preamplifier and the next generation front end cartridge/headamplifier designs on Guzik Spinstands. Previous generation of head amplifiers together with UP10M are also supported by RWA 4000 Systems. Please note that you need UP10M modification 3 or 4 to connect to RWA 4000.
Digital Read Channel
All measurements are performed digitally by a separate GSA 6000 unit. For additional details please refer to the following Guzik product bulletins:
“GSA 6000 Series Guzik Signal Analyzers” document P/N 02-107547,
“Read-Write Analyzer Systems 4000 Series” document P/N 02-107536.
System Integration Requirements
RWA System 4000 Series (RWA 4000 Series and GSA 6000)
Guzik Spinstand DTR 3000, Guzik Spinstand V2002, Canon Spinstand, or HDD
WITE32 Revision 4.40 or greater
Windows-based host computer with two spare PCI-Express 16x slots to accommodate Guzik PCI-Express Bridge card and processing GPU card
RWA 4000 Specifications*
|Write Channel / Pattern Generator||RWA 4004||RWA 4006||RWA 4008|
|Maximum Data Rate, Gbit/s||4||6||8|
|Minimum Bit Cell||250ps||167ps||125ps|
|Absolute Position Accuracy
(for any transition,
at maximum data rate)
|5 ps (typ)
10 ps (max)
(for any transition)
|Jitter at max. data rate
Random Pattern, RMS
Repetitive Pattern, RMS
|Frequency Resolution||< 1 Hz|
|Frequency stability||±2.5ppm up to 75○C, ±1ppm/year|
|Random Pattern Maximum Length||RWA-4000 Rev.2 and later: 2.6 GBit
RWA-4000 Rev.1: 256 Kbit
|Analog Channel||RWA-4000 Rev.1||RWA-4000 Rev.2 and later|
|Analog Bandwidth (open filter)||3.2 GHz @ –3dB||5.5 GHz @ –3dB|
(with anti-aliasing low-pass filters)
|2.5 GHz LPF: 2.5 GHz @ –3dB
1.75 GHz LPF: 1.8 GHz @ –3dB
800 MHz LPF: 790 MHz @ –3dB
400 MHz LPF: 380 MHz @ –3dB
200 MHz LPF: 200 MHz @ –3dB
100 MHz LPF: 90 MHz @ –3dB
80 MHz LPF: 80 MHz @ –3dB
|2000 MHz LPF: 2.2 GHz @ –3dB
1000 MHz LPF: 1.0 GHz @ –3dB
500 MHz LPF: 550 MHz @ –3dB
250 MHz LPF: 250 MHz @ –3dB
|Flatness||±0.3 dB up to 2 GHz||±0.25 dB up to 1 GHz
±0.50 dB up to 4 GHz
|Group delay flatness||TBD||±80 ps dB
(from 200 MHz to 4 GHz)
|Input Return Loss||10 dB to 3 GHz||14 dB to 5 GHz|
|Output Return Loss||16 dB to 3 GHz||13 dB to 5 GHz|
|Non-Linear Distortions||< 1.5 %
–10 dBm output level)
|< 1.0 %
–6 dBm output level)
|Rise/Fall Time||120 ps||80 ps (10% to 90%)|
|Acoustic Emission Sensor Channels|
|Bandwidth||1 MHz @ –3dB|
|Sampling Rate||3 MSPS|
|Number of Channels||2|
|Analog Bandwidth||250 MHz|
|Sampling Rate||1 GSPS|
|Guzik Servo Decoder||Digital programmable decoder|
|Drive Servo Decoder||Digital programmable decoder; supports decoding of servo formats of all major hard drive manufacturers|
|Supported Servo Burst Modulation||Amplitude, Phase-change, and Chevron phase|
|PRML Chip Integration|
|Data Rate||Depending on commercial PRML chips|
|Supported PRML Chips||Chips from all major manufacturers are supported. New PRML chips can be integrated upon request.|
|PRML Channel Optimization and BER measurements||Supported by WITE32 software module|
|Size, W x D x H||17.5” x 15.8” x 3.2”
444 x 400 x 81 mm
|Weight||12 lbs / 5.4 kg|
|Rack-Mount Installation Kit||Available|
|Power||110 VAC (± 10%, 50/60 Hz, 1A approx.)
230 VAC (± 10%, 50/60 Hz, 0.5A approx.)
* Specifications are subject to change without notice.
This product is protected by the following US Patents: 6,469,862; 6,760,171; 6,785,085; 7,221,220; 7,408,495.