Transformer Receiver Pull-Down Circuit for Ringing Suppression

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Solution Overview

Problem

Parasitic capacitances in transformer communication systems cause ringing in transmitted signals, leading to spurious voltage peaks that result in false data detection.

Innovation Solution

A pull-down circuit in the receiver is activated responsive to the data-indicating voltage peak to selectively tie the output line to ground, suppressing false data detection by grounding the secondary logic value.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If transformers are used for high efficiency communication, then power consumption is reduced, but ringing occurs in transmitted signals causing false data detection

Engineering Contradiction:

Improvepower consumptionVSAvoiddata detection accuracy

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

A pull-down circuit is introduced as an intermediary component between the transformer output and the data detection circuit. This pull-down circuit actively suppresses ringing signals by providing a discharge path for parasitic capacitance, preventing false data detection while maintaining the energy efficiency of transformer-based communication

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful ringing effect caused by parasitic capacitance into a beneficial signal suppression mechanism. By detecting the ringing signal and activating the pull-down circuit, the previously harmful oscillations are transformed into a controlled discharge process that eliminates false detections

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Productivity

If data rate is increased over 100 Mbps, then communication speed is improved, but parasitic capacitances cause signal interpretation errors

Engineering Contradiction:

Improvedata rateVSAvoidsignal interpretation accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The pull-down circuit is activated in advance upon detection of a voltage peak, before the ringing signal can cause false data detection. This preliminary action of grounding the output line prevents subsequent signal interpretation errors, enabling reliable high-speed communication

Inventive Principle:

Principle #10Preliminary action

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

Effectively suppresses spurious voltage peaks, preventing false data detection and enhancing data transmission reliability.

Implementation Method 1

a transformer with primary and secondary windings and an isolation barrier

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

relatively small parasitic capacitances of transmitter side (primary side) transistors can become increasingly important to overall system performance

Methodology Applied

Scientific EffectParasitic capacitance: Parasitic Capacitance

Data Source

PatentUS20260039292A1Transformer communication system with ringing suppression

Publication Date: 2026.02.05 TEXAS INSTRUMENTS INC

AI summary

In described examples, an integrated circuit (IC) includes a differential to single ended (DSE) circuit, and first, second, third, and fourth transistors. A control terminal of the first transistor is coupled to a first output of the DSE circuit. A control terminal of the second transistor is coupled to a second output of the DSE circuit. A first terminal of the third transistor is coupled to a first terminal of the first transistor and a control terminal of the third transistor is coupled to a first terminal of the second transistor. A first terminal of the fourth transistor is coupled to the first terminal of the second transistor, and a control terminal of the fourth transistor is coupled to the first terminal of the first transistor.