Bidirectional Communication Circuit Signal Mixing Prevention
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Solution Overview
Problem
In high-speed communication systems with bi-directional data transmission, existing methods face challenges in preventing signal mixing and managing roundtrip times, which complicates testing of high-speed integrated circuits using automatic test equipment.
Innovation Solution
A communication circuit design that generates complementary driver signals to transmit data, allowing simultaneous bi-directional communication over a signal line without active signal correction, eliminating the need for time matching between signal generators and receivers, and incorporating a replica generator and extraction circuit to isolate data signals from the device under test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmitter is only allowed to transmit data if no data is received at the same time, then signal mixing is avoided, but roundtrip time increases and data transmission efficiency decreases
Solution Approach 1:
The data stream is segmented into two separate streams: one for transmission and one for reception. The transmission data stream is sent out while the reception data stream is simultaneously received and processed, allowing bidirectional communication without signal mixing or roundtrip delays.
Solution Approach 2:
The patent introduces a temporal dimension by creating separate processing paths for transmission and reception data streams. By operating in different temporal dimensions simultaneously, the system achieves full-duplex communication over a half-duplex physical link without signal interference.
2Loss of time
If driver and comparator in ATE are separated and connected over independent lines to DUT, then roundtrip time impact is reduced, but device complexity and test setup complexity increase
Solution Approach 1:
The patent merges the transmission and reception functions into a single integrated communication circuit at each end of the link. This combination eliminates the need for separate driver and comparator connections, reducing test setup complexity while maintaining low roundtrip time through simultaneous bidirectional operation.
3Measurement precision
If comparator threshold is switched according to transmitted data stream value, then signal detection accuracy is improved, but device complexity and signal processing complexity increase
Solution Approach 1:
The patent creates a copy of the transmitted data stream that is used to control the comparator threshold. This copy is generated through simple logic operations rather than complex signal processing, maintaining detection accuracy while minimizing added complexity.
4Loss of time
If bi-directional communication is implemented over the same physical link, then loss of time is reduced, but signal mixing occurs and reliability decreases
Solution Approach 1:
The incoming signal is segmented into two separate data streams through the extraction circuit: one stream represents the transmitted data (used for threshold control) and the other represents the received data (used for detection). This segmentation prevents signal mixing while enabling simultaneous bidirectional communication.
Data Source
AI summary
A communication circuit for providing a bi-directional data transmission over a signal line, thereby receiving a first digital data stream and transmitting a corresponding first signal into a near end of a signal line to a remote device, the remote device being connected to a far end of the signal line, receiving a second signal at the near end of the signal line from the remote device and deriving a second digital data stream therefrom, having a replica generator for providing, in response to the first digital data stream or a signal derived therefrom, a replica signal, and an extraction circuit for extracting the second digital data stream from the second signal in response to the replica signal and a comparator signal deduced from the near end of the signal line and an automatic test equipment having a plurality of communication circuits each providing a bi-directional data transmission.