Compensating TSV Signal Delays via Frequency-Dependent Capacitance Detection
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Solution Overview
Problem
Three-dimensional (3D) memory devices with through-silicon vias (TSVs) experience signal delays due to frequency-dependent parasitic capacitance, leading to inconsistent delays across signals, which can cause transmission errors.
Innovation Solution
A semiconductor device with conductive vias and evaluation circuits that detect signal frequencies and adjust timing to compensate for propagation delays caused by effective capacitance, using delay circuits and latch circuits to differentiate between low and high frequency signals and adjust data transfer timing accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If TSVs are used to interconnect dies in 3D memory devices, then chip size is reduced and bandwidth is increased, but signal delays become inconsistent due to frequency-dependent parasitic capacitance
Solution Approach 1:
The evaluation circuit performs preliminary detection of signal frequency characteristics before data transfer, and the timing adjustment circuit pre-adjusts timing based on detected frequency ranges. This preliminary action allows the system to compensate for frequency-dependent capacitance effects before they cause transmission errors, resolving the reliability issue while maintaining the compact 3D structure
Solution Approach 2:
The invention changes the timing parameters of signal transmission based on detected frequency characteristics. By adjusting timing parameters according to the frequency range detected in the TSV, the system compensates for varying capacitance effects, ensuring consistent signal transmission reliability across different operating conditions
2Productivity
If signal frequency is increased to improve data transfer speed, then bandwidth increases, but effective capacitance of TSV decreases leading to inconsistent delays
Solution Approach 1:
The evaluation circuit provides feedback about signal frequency characteristics to the timing adjustment circuit. This feedback mechanism allows the system to continuously adapt timing adjustments based on actual operating conditions, maintaining reliable signal transmission across varying frequencies and data transfer speeds
Solution Approach 2:
The timing adjustment circuit dynamically changes timing parameters based on detected frequency ranges. This dynamic adaptation allows the system to optimize for both high-speed data transfer and signal reliability by adjusting timing in real-time according to operating conditions
3Reliability
If evaluation circuits and timing adjustment circuits are added to compensate for frequency-dependent delays, then signal transmission reliability improves, but device complexity increases
Solution Approach 1:
The evaluation and timing adjustment circuits are implemented locally at specific points in the signal path rather than throughout the entire system. This localized approach provides the necessary reliability improvements while minimizing the overall complexity increase by concentrating functional additions only where needed
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
This solution reduces signal delays and transmission errors by accurately compensating for frequency-dependent capacitance, enabling reliable data transfer across a wide range of clock frequencies and improving timing margins in 3D memory devices.
Implementation Method 1
A TSV in HBM may have a parasitic resistance and a parasitic capacitance, which may cause a delay of a signal between an I/F die and a core die transmitted through the TSV. Particularly, capacitance of the TSV may be frequency dependent and effective capacitance (Ceff) of the TSV may appear to be different, depending on a frequency of the signal.
Data Source
AI summary
Apparatuses for monitoring a signal on a conductive via are described. An example apparatus includes: a controller, a first conductive via, a second conductive via and an evaluation circuit. The controller provides a clock signal as a first signal. The first conductive via provides a second signal responsive to the first signal. The second conductive via provides a third signal responsive to the second signal. Responsive to the third signal, the evaluation circuit provides an evaluation result signal. The evaluation result signal is indicative of a frequency of the clock signal, based on a delay of the third signal relative to the clock signal. The first conductive via, the second conductive via and the evaluation circuit may be included in an interface die. The evaluation circuit may detect whether a frequency of the first signal is below a first threshold frequency and may further provide the evaluation result signal.