Shared Magnetic Circuit for TDD Transceiver Size Reduction
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Solution Overview
Problem
The physical size of magnetic circuits in wireless communication devices is limited by the large size of inductive elements, hindering the miniaturization of these devices and increasing power consumption.
Innovation Solution
The implementation of a shared magnetic circuit that operates as both a voltage step-up circuit in transmit mode and a current step-up or maintenance circuit in receive mode, allowing for the sharing of circuitry between transmit and receive paths in a time division duplexing (TDD) communication system, which reduces the overall size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate magnetic circuits are used for transmit and receive paths, then the gain and noise performance are maintained, but the device size increases
Solution Approach 1:
The patent combines separate transmit and receive magnetic circuits into a single shared magnetic circuit. The transmit path includes a driver amplifier coupled to the shared magnetic circuit, and the receive path includes a low noise amplifier coupled to the same shared magnetic circuit. This merging reduces the overall device size while maintaining the required gain and noise performance through proper circuit design and switching mechanisms.
Solution Approach 2:
The shared magnetic circuit is designed to serve dual functions: it operates as a voltage step-up circuit in transmit mode and as a current step-up or maintenance circuit in receive mode. This multi-functionality allows a single magnetic circuit to replace what would traditionally require two separate magnetic circuits, thereby reducing device size while maintaining performance.
2Reliability
If separate magnetic circuits are used for transmit and receive paths, then the performance requirements are met, but the power consumption increases
Solution Approach 1:
By merging the transmit and receive magnetic circuits into a single shared magnetic circuit, the patent reduces the total power consumption. The shared magnetic circuit eliminates redundant magnetic elements and reduces the overall power required to maintain the same performance levels in both transmit and receive paths.
Solution Approach 2:
The shared magnetic circuit is designed to efficiently operate in both transmit and receive modes, adapting its function accordingly. In transmit mode, it provides voltage step-up; in receive mode, it provides current step-up or maintenance. This adaptive multi-functionality reduces power consumption compared to having two separate dedicated magnetic circuits.
3Reliability
If inductive elements are made larger to maintain performance, then the gain and noise performance are improved, but the device size increases
Solution Approach 1:
The patent merges the transmit and receive inductive elements into a single shared magnetic circuit with shared inductors. This consolidation maintains the necessary inductance values for proper gain and noise performance while significantly reducing the total volume occupied by magnetic elements compared to having separate circuits.
Solution Approach 2:
The shared magnetic circuit is designed to provide the necessary inductance for both transmit and receive functions. By properly designing the shared inductors to serve dual purposes, the patent maintains performance requirements while reducing the volume required for magnetic elements.
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 approach enables the reduction of circuit size and power consumption while maintaining comparable gain and noise performance, facilitating the miniaturization of wireless communication devices.
Implementation Method 1
A magnetic circuit may be used in the transmit path to provide amplifier input matching, and a magnetic circuit may be used in the receive path to provide low noise amplifier (LNA) output matching. The inductive elements may comprise one or more inductors and one or more transformers.
Data Source
AI summary
A transceiver circuit includes transmit circuitry comprising a transmit baseband filter and a driver amplifier having an output coupled to a power amplifier, receive circuitry comprising a low noise amplifier and a receive baseband filter, mixer circuitry and a magnetic circuit, wherein the mixer circuitry and the magnetic circuit are coupled between the transmit baseband filter and the driver amplifier, and are further coupled between the low noise amplifier and the receive baseband filter, wherein the mixer circuitry and the magnetic circuit are shared between the transmit circuitry and the receive circuitry in a time division duplexing (TDD) communication system.