Shared Filter Transceiver Switching With Residual Signal Discharge

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Solution Overview

Problem

Transceivers face challenges in reducing the operating mode transition period, which is critical in meeting application specifications, especially when shared circuit components require initialization procedures.

Innovation Solution

A transceiver control circuit with a shared filtering circuit, mode-switches, and short-circuit switches that control signal paths to expedite the transition from receiving to transmitting mode by temporarily activating short-circuit switches during the transition period, ensuring faster settling times and preventing erroneous signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the transceiver shares circuit components between transmitter and receiver to reduce circuit area and hardware cost, then the circuit area and hardware cost are reduced, but the operating mode transition period increases because the shared components must complete initialization procedures before mode switching

Engineering Contradiction:

Improvecircuit areaVSAvoidoperating mode transition period

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The short-circuit switch is activated before the mode transition to pre-clear residual signals from the shared filtering circuit. By temporarily short-circuiting the differential output terminals of the filter during the transition period, residual signals are discharged faster, allowing the circuit to be ready for the new mode sooner without requiring a long initialization period.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The harmful residual signals that cause delay during mode transition are extracted and discharged through the short-circuit switch. By providing a dedicated discharge path for these residual signals, the initialization period of the shared filtering circuit is significantly reduced, enabling faster mode switching while maintaining the shared architecture.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the transceiver waits for shared circuit components to complete initialization before switching modes, then signal integrity is maintained, but the switching speed and responsiveness to application requirements deteriorate

Engineering Contradiction:

Improvesignal integrityVSAvoidmode switching speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The short-circuit switch enables the system to rush through the initialization period by actively discharging residual signals during the transition. Instead of passively waiting for signals to decay naturally, the circuit actively clears residual signals, skipping the waiting period and achieving faster mode switching while maintaining signal integrity through controlled discharge.

Inventive Principle:

Principle #21Skipping (Rushing through)

3Ease of manufacture

If the transceiver uses a shared filtering circuit between transmitter and receiver, then hardware cost is reduced, but erroneous signals may be transmitted during mode transition due to residual signals in the filter

Engineering Contradiction:

Improvehardware costVSAvoiderroneous signals during transition

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The harmful residual signals that normally cause erroneous transmission during mode transition are converted into a controllable discharge process. The short-circuit switch provides a controlled path for these residual signals to be rapidly discharged, transforming the harmful effect into a beneficial fast-clearing mechanism that prevents erroneous signals while maintaining the cost-effective shared architecture.

Inventive Principle:

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

Data Source

PatentUS10587303B2Transceiver control circuit for reducing operating mode transition period of transceiver

Publication Date: 2020.03.10 REALTEK SEMICON CORP

AI summary

A transceiver control circuit of a transceiver is disclosed including: a receiver circuit; a transmitter circuit; a shared filtering circuit shared by the receiver circuit and the transmitter circuit; a first mode-switch for switching signal input paths of the shared filtering circuit; a second mode-switch for switching signal output paths of the shared filtering circuit; a mode-switch control circuit for controlling the first mode-switch and the second mode-switch; a short-circuit switch coupled between two output terminals of a filter within the shared filtering circuit; and a short-circuit switch control circuit. In a period during which the transceiver transits from a receiving mode to a transmitting mode, the short-circuit switch control circuit turns on the short-circuit switch for a certain period and then turns off the short-circuit switch.