Integrated RF Transceiver Chip Reducing PCB Area

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Solution Overview

Problem

Conventional RF transceiver front-end architectures require additional components like impedance matching networks and baluns outside the chip, leading to increased space occupation, material costs, and power consumption due to impedance mismatch issues, which are not efficiently addressed by existing gallium-arsenide technology.

Innovation Solution

A highly-integrated RF transceiver front-end circuit with integrated T/R switches and impedance matching networks within the transceiver chip, utilizing a balun to convert RF signals between single-ended and differential signals, reducing the need for external components and optimizing impedance matching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional impedance matching networks and baluns are disposed outside the chip, then impedance matching performance is improved, but the area and material cost of the printed circuit board are increased

Engineering Contradiction:

Improveimpedance matching performanceVSAvoidprinted circuit board area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent integrates the impedance matching networks and baluns directly into the transceiver chip, merging previously separate external components with the chip circuitry. This integration eliminates the need for discrete external impedance matching networks and baluns, thereby reducing the printed circuit board area while maintaining impedance matching performance through on-chip implementation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The transceiver chip is designed to perform multiple functions including signal reception, transmission, impedance matching, and signal transformation (single-ended to differential and vice versa). By making the chip multi-functional, it eliminates the need for separate dedicated external components for each function, reducing overall board area and component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If GaAs technology is used for T/R switch, then parasitic resistance is reduced, but manufacturing cost and insertion loss are increased

Engineering Contradiction:

Improveparasitic resistance reductionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the material parameter from GaAs to silicon-based materials for the T/R switch implementation. This parameter change maintains the electrical performance benefits (low parasitic resistance) while dramatically improving manufacturability and reducing costs by utilizing standard silicon CMOS fabrication processes that are more mature and cost-effective than GaAs processes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the GaAs-based T/R switch mechanism with a silicon-based CMOS implementation. This substitution replaces the specialized GaAs material and process with standard silicon technology, achieving similar or better performance while enabling system-on-chip integration and reducing manufacturing complexity and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If GaAs technology is used for T/R switch, then switching performance is improved, but system-on-chip integration is prevented

Engineering Contradiction:

Improveswitching performanceVSAvoidsystem-on-chip integration capability

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the material and process parameters from GaAs to silicon CMOS, enabling the T/R switch to be fabricated using standard complementary metal-oxide-semiconductor technology. This parameter change allows full system-on-chip integration while maintaining switching performance through optimized transistor design and circuit topology suitable for CMOS implementation.

Inventive Principle:

Principle #35Parameter changes

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 the area and material costs of the printed circuit board, minimizes power consumption by eliminating impedance mismatch, and enhances noise immunity through differential signal transmission, as demonstrated by measurement results showing improved gain and return loss performance.

Implementation Method 1

the impedance matching unit is configured to convert the RF signal into a differential signal under a receiving mode or to convert a differential signal into the RF signal under a transmitting mode

Methodology Applied

Scientific EffectImpedance matching:

Implementation Method 2

the T/R switch transmits the differential signal from the impedance matching unit to the receiver unit under the receiving mode, and transmits the differential signal from the transmitter unit to the impedance matching unit under the transmitting mode

Methodology Applied

Scientific EffectSignal switching:

Data Source

PatentUS8138853B2Front-end architecture of RF transceiver and transceiver chip thereof

Publication Date: 2012.03.20 MEDIATEK INC

AI summary

An RF front-end architecture is operated in either a transmitting or a receiving mode. The RF front-end architecture comprises an antenna, an impedance match network, a balun and a transceiver chip. The transceiver chip comprises first and second transmit/receive (TR) switches, a transmitter, and a receiver. Because two TR switches are integrated into the chip, the printed circuit board area, BOM cost and pin count of the transceiver chip can be greatly reduced.