Real-Equivalent-Time Flash Array Digitizer for Optical Transceiver Tuning
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Solution Overview
Problem
The lengthy process of tuning and testing optical transceivers in manufacturing, which involves multiple iterations of parameter sweeping and measurement, creates a bottleneck in production and increases costs due to acquisition time limitations in measurement throughput.
Innovation Solution
An integrated oscilloscope employing a real equivalent time flash array digitizer (RETFAD) and a neural network processes waveform image outputs to associate with optical transceiver tuning parameters, eliminating the need for standard A/D converters and operating in equivalent time mode only, thereby speeding up the tuning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional standard A/D converters and real-time sampling oscilloscope architecture are used, then measurement precision is maintained, but acquisition time is too long creating a bottleneck in production throughput
Solution Approach 1:
The patent replaces the traditional mechanical/electronic sequential sampling process with a parallel flash array digitizer system. Instead of using a standard A/D converter that processes samples sequentially over time, the invention uses multiple parallel comparison paths that simultaneously determine voltage levels across the entire waveform range in a single shot, eliminating the time-consuming sequential conversion process.
Solution Approach 2:
The patent transforms the measurement from a time-sequential process to a spatial-parallel process. By using an array of comparators arranged in parallel rows and columns, the system maps the voltage-time waveform into a two-dimensional array structure where each row represents a voltage threshold and each column represents a time sample point, allowing simultaneous processing of multiple data points.
2Manufacturing precision
If multiple iterations of tuning parameters and measurements are performed to achieve precise optical transceiver tuning, then manufacturing precision is improved, but the process takes up to 2 hours creating a production bottleneck
Solution Approach 1:
The patent implements preliminary action by using the flash array digitizer to capture the entire waveform characteristics in a single shot before any iterative tuning begins. The system pre-acquires comprehensive waveform data including eye diagrams and TDECQ measurements simultaneously, allowing the tuning process to start from an informed state rather than requiring multiple sequential measurement iterations.
Solution Approach 2:
The patent creates multiple copies of the measurement capability through the array of comparators. Each comparator in the flash array creates a parallel copy of the waveform analysis at different voltage thresholds, enabling simultaneous extraction of multiple measurement parameters (amplitude, eye height, eye width, TDECQ) from a single waveform capture event, thereby eliminating the need for repeated measurements.
3Adaptability or versatility
If standard A/D converters are used for waveform acquisition, then compatibility with existing systems is maintained, but the conversion process is too slow for high-speed production testing
Solution Approach 1:
The patent segments the single slow A/D conversion process into multiple parallel comparison operations. Instead of one converter processing samples sequentially, the system divides the voltage range into multiple threshold levels and uses an array of comparators to simultaneously evaluate the input signal against all thresholds in parallel, achieving high-speed conversion while maintaining measurement accuracy.
Solution Approach 2:
The flash array digitizer performs multiple measurement functions simultaneously - it captures the complete waveform, extracts amplitude information, determines eye diagram characteristics, and calculates TDECQ values all in a single operation. This multi-functional approach replaces what would traditionally require multiple separate measurement instruments and sequential operations, achieving both speed and versatility.
Data Source
AI summary
A test and measurement system includes a clock recovery circuit configured to receive a signal from a device under test and to produce a pattern trigger signal, a flash array digitizer having an array of counters having rows and columns configured to store a waveform image representing the signal received from the device under test, a row selection circuit configured to select a row in the array of counters, and a ring counter circuit configured to receive a clock signal, select a column in the array of counters, produce end of row signals, and produce a fill complete signal upon all of the columns having been swept, the fill complete signal indicating completion of the waveform image, an equivalent time sweep logic circuit configured to receive the pattern trigger signal and the end of row signals from the ring counter and to produce the clock signal with a delay to increment a clock delay to the ring counter until the fill complete signal is received, and a machine learning system configured to receive the waveform image and provide operating parameters for the device under test. A test and measurement system includes a flash array digitizer having an array of counters having rows and columns configured to store a waveform image representing a signal received from a device under test, a row selection circuit configured to select a row in the array of counters, a column selection circuit configured to select a column in the array of counters, a sample clock connected to the row selection circuit and the column selection circuit, and a machine learning system configured to receive the waveform image from the flash array digitizer and provide operating parameters for the device under test.