T-Coil Equalization in Data Receivers for Low-Power ISI Compensation
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Solution Overview
Problem
Existing semiconductor circuits face issues of increased circuit area and current consumption due to the use of continuous time linear equalizers, which also lead to decreased DC gain.
Innovation Solution
Implementing a data receiving circuit with a T-coil equalization circuit that includes a first and second inductor and a capacitor, coupled to adjust inductive peaking via a control signal, and a data transmission/receiving circuit with a T-coil equalization circuit and a data training circuit to control inductive peaking and compensate for inter-symbol interference without reducing DC gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous time linear equalizer is used to compensate for inter-symbol interference, then signal quality is improved, but circuit area and current consumption increase
Solution Approach 1:
The patent changes the equalization approach from continuous-time linear equalization to T-coil based equalization with adjustable inductive peaking. By modifying the equalization mechanism and using inductors with capacitors to create peaking effects, the circuit achieves signal compensation with lower current consumption and reduced circuit area compared to continuous time linear equalizers
Solution Approach 2:
The patent extracts and removes the continuous time linear equalizer from the circuit configuration. Instead, it uses a simplified T-coil structure with inductors and capacitors that provides the necessary equalization function without the complexity and high power consumption of continuous time linear equalizers
2Reliability
If a continuous time linear equalizer is used to compensate for inter-symbol interference, then signal quality is improved, but DC gain decreases
Solution Approach 1:
The patent employs T-coils with adjustable inductive peaking parameters to achieve equalization. By carefully selecting and adjusting the inductor and capacitor values, the circuit achieves signal quality improvement through peaking effects while maintaining DC gain, avoiding the DC gain reduction inherent in continuous time linear equalizer approaches
3Use of energy by moving object
If a T-coil equalization circuit is used to compensate for inter-symbol interference, then current consumption is reduced, but circuit complexity increases
Solution Approach 1:
The patent merges the T-coil structure with the existing equalization function. By integrating inductors and capacitors into a T-coil configuration that performs both impedance matching and equalization, the circuit achieves multiple functions with a unified structure, reducing overall complexity despite the introduction of reactive components
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
Improves signal quality, increases layout margin, and reduces current consumption compared to using continuous time linear equalizers.
Implementation Method 1
The T-coil equalization circuit may include a T-coil including a first inductor, a second inductor, and a capacitor, wherein the first and second inductors are connected in series so that a second end of the first inductor is connected to a first end of the second inductor
Data Source
AI summary
A data receiving circuit includes a first inductor, a second inductor, and a T-coil equalization circuit. The first inductor is coupled between a first node coupled with a data input/output pad and a second node. The second inductor is coupled between the second node and an internal circuit. The T-coil equalization circuit includes a T-coil with at least one capacitor coupled with the second node. The T-coil equalization circuit is configured to adjust inductive peaking of the T-coil in response to a control signal.