Signal I/O Circuit Using Reverse Virtual Current for Line Capacitance
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Solution Overview
Problem
Existing semiconductor devices face challenges in maintaining high signal quality due to increased transmission speeds and bandwidths, which requires reducing the capacitance of input/output lines without affecting other circuit operations.
Innovation Solution
The proposed signal input/output circuit includes a signal amplification circuit and a current control circuit. The signal amplification circuit amplifies input signals, while the current control circuit generates a reverse virtual current to offset parasitic currents on the input/output lines, thereby reducing capacitance and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific circuit is added to reduce the capacitance of the input/output line, then the signal quality is improved, but the device complexity increases and other circuit operations may be affected
Solution Approach 1:
The patent combines the capacitance reduction function with the existing buffer circuit by adding a current control circuit that generates reverse virtual current. This merges the capacitance compensation function into the signal processing path rather than adding a separate dedicated circuit, thereby reducing device complexity while maintaining signal quality improvement.
Solution Approach 2:
The patent changes the electrical parameter (current) by introducing a current control circuit that generates reverse virtual current to offset parasitic current. This parameter-based approach allows capacitance reduction without adding complex structural elements, resolving the contradiction between signal quality improvement and device complexity.
2Speed
If the capacitance of the input/output line is reduced, then the transmission speed and bandwidth are improved, but a specific circuit must be added which affects other circuit operations
Solution Approach 1:
The patent uses parameter changes by controlling the current flow through the buffer circuit to generate reverse virtual current. This allows capacitance reduction for improved transmission speed while maintaining compatibility with other circuit operations, as the same buffer circuit continues to perform its signal buffering function without interference.
Solution Approach 2:
The buffer circuit is made multi-functional by enabling it to simultaneously perform signal buffering and capacitance reduction through the current control mechanism. This universal approach allows the same circuit to improve transmission speed while maintaining compatibility with other circuit operations, avoiding the need for separate dedicated circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
By inducing a reverse virtual current to offset parasitic currents, the circuit effectively reduces the capacitance of the input/output lines, thereby enhancing signal quality and maintaining the high transmission speeds and bandwidths required by advanced semiconductor devices.
Implementation Method 1
The current control circuit may be configured to generate a reverse virtual current for offsetting parasitic currents of the input/output line, based on the output signal of the signal amplification circuit.
Data Source
AI summary
A signal input/output circuit includes a signal amplification circuit and a current control circuit. The signal amplification circuit configured to amplify and output an input signal transmitted through an input/output line. The current control circuit configured to induce a reverse virtual current corresponding to an output signal of the signal amplification circuit. The current control unit configured to reflect the reverse virtual current on the input/output line.