The SHF EA 44 Error Analyzer is a tool for the detection of errors in gigabit transmission systems. Used in conjunction with the SHF BPG 44 or BPG 44 E Bit Pattern Generators, a system for bit error rate tests can be formed. Ease of use is ensured by simple hardware functions allowing phase adjustments or input threshold variations of the analyzer. It is therefore ideal for research and development of high speed logic MMICs and digital communications systems. Further applications include the testing of high rate PCM and SDH systems as well as digital optical components and sub-nanosecond pulse engineering.

      Wideband operation from 2 to 44 Gbps simplifies testing, since the enire bandwidth can be easily accessed by altering the frequency of the clock signal. An input for an external clock generator is provided, and an internal fixed frequency low noise crystal oscillator clock is available as an option. As standard, the instrument operates at half-clock, so that the clock frequency is half that of the bit rate being analyzed. A full-clock version is also available. The phase shift between the clock and data signals can be adjusted using a computer controlled delay line, offering a delay of up to 160 ps, with a resolution of 1 ps. Error contours of constant error rate can be automatically measured by the instrument to aid setup and analysis.

      A 4:1 44 GBit/s fast demultiplexer circuit reduces the input data stream to four signals, each with a rate of 11 GBit/s. The data is compared bit by bit to internally generated PRB sequences. Built in PRBS lengths are 231¿1, 223¿1, 215¿1 or 27¿1. Errors are displayed for each channel as well as the total number of errors. Measurement intervals can be varied within the range 106¿1016 Bit/s.

      Word synchronization is achieved automatically, as indicated by four LEDs which light up when synchronization has been achieved. Shifting of sub-sequences is also tested, and a ¿MUX Error¿ is displayed if incorect multiplexer interleaving is detected even though a single sub-sequence contains no errors.

Features:

• Handles CCITT-conforming PRBS patterns 27-1, 215-1, 223-1, 231-1
• Self-synchronizing, broadband operation
• Threshold adjustment by GPIB or manual thumbwheel
• MUX error indication
• Clock outputs at sub-harmonic rates
• Word frame output from internal 11 GBit/s channel
• A External clock input 22 GHz for BPG 40 A, BPG 44 or BPG 44 E compatibility Internal computer controlled 22 GHz timing delay line
• Display of total errors and the errors from each of the four 11 GBit/s sub-channels
• Full clock or half clock selectable Internal 6 digit true frequency counter displays the bit rate
• Measurement sequence start by TTL signal or push button
• Wide range of selectable gate times External GPIB control Low noise, low jitter timing circuits Burst Mode (fast synchronizing) capability