Receiving Circuit Feedback Control for High-Speed Signal Integrity
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Solution Overview
Problem
In high-speed semiconductor operations, receiving circuits face challenges in accurately transmitting and receiving signals due to factors like inter-symbol interference and cross-talk, requiring precise adjustment of gain and bandwidth to compensate for these issues.
Innovation Solution
A receiving circuit configuration that includes multiple amplifying circuits and a feedback circuit, which adjusts voltage levels and bandwidths of amplified signals using current and resistance control signals, and a coupling circuit to manage AC and DC gains effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operation speed of the semiconductor apparatus is increased to achieve higher frequency signal transmission, then productivity is improved, but signal loss due to inter-symbol interference and cross-talk increases
Solution Approach 1:
The patent implements a feedback circuit that receives output signals from the third amplifying circuit and generates control signals to adjust the gain and bandwidth of the first and second amplifying circuits. This closed-loop feedback mechanism dynamically compensates for signal loss caused by inter-symbol interference and cross-talk, enabling stable high-speed signal transmission by continuously optimizing the amplification characteristics based on actual output conditions.
Solution Approach 2:
The patent employs dynamic adjustment of gain and bandwidth parameters through control circuits that modify the operating characteristics of the amplifying circuits in real-time. The gain control circuit and bandwidth control circuit enable the receiving circuit to adapt its parameters according to signal conditions, allowing optimal performance across varying frequencies and compensating for frequency-dependent signal loss.
2Measurement precision
If the gain of the receiving circuit is increased to compensate for signal loss, then signal accuracy is improved, but bandwidth is reduced
Solution Approach 1:
The patent independently controls gain and bandwidth as separate adjustable parameters through dedicated control circuits. The gain control circuit modifies the amplification factor to improve signal accuracy, while the bandwidth control circuit adjusts the frequency response to maintain adequate bandwidth. This decoupled parameter control allows simultaneous optimization of both signal accuracy and bandwidth, resolving the traditional trade-off between these two parameters.
3Measurement precision
If multiple amplifying circuits are added to achieve appropriate gain and bandwidth, then signal reception accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs the feedback circuit and control circuits to perform multiple functions simultaneously. The feedback circuit not only monitors output signals but also generates control signals for both gain and bandwidth adjustment. The control circuits serve dual purposes of parameter adjustment and signal conditioning. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby managing complexity while achieving accurate signal reception.
Data Source
AI summary
A receiving circuit may include a first amplifying circuit, a second amplifying circuit, a third amplifying circuit, and a feedback circuit. The first amplifying circuit amplifies a first input signal and a second input signal to generate a first amplified signal and a second amplified signal, respectively. The second amplifying circuit amplifies the first amplified signal and the second amplified signal to generate a first preliminary output signal and a second preliminary output signal, respectively. The third amplifying circuit amplifies the first preliminary output signal and the second preliminary output signal to generate a first output signal and a second output signal, respectively. The feedback circuit changes voltage levels of the first amplified signal and the second amplified signal based on a current control signal, the first output signal, and the second output signal.