RF Front End Circuit Single Switch Dual-Function Amplifier
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Solution Overview
Problem
Existing enhanced sensitivity RF front end circuits require two switches, leading to increased cost, space requirements, and power loss during receive mode, and necessitate both a power amplifier and a low noise amplifier, resulting in additional space and cost.
Innovation Solution
A radio frequency (RF) front end circuit utilizing a single DPDT switch and a transformer to convert balanced signals, with the switch operating in two states to route signals through an amplifier and filter, and the amplifier operating as both a power amplifier and a low noise amplifier to reduce component count and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two switches are used in the RF front end circuit, then the circuit can properly route signals in both transmit and receive modes, but the device complexity increases, cost increases, space requirements increase, and power loss during receive mode increases
Solution Approach 1:
The patent merges the functions of two separate SPDT switches into a single DPDT switch. The DPDT switch has two poles that can simultaneously control two signal paths, eliminating the need for two separate switches while maintaining proper signal routing in both transmit and receive modes. This reduces device complexity, cost, and space requirements.
Solution Approach 2:
The DPDT switch performs multiple functions that were previously distributed across two separate switches. It can simultaneously route signals for both transmit and receive operations, making it a universal switching element that replaces two specialized SPDT switches, thereby reducing overall circuit complexity.
2Reliability
If two switches are used in the RF front end circuit, then signal routing is reliable, but the cost and space requirements increase
Solution Approach 1:
The patent merges the functions of two separate SPDT switches into a single DPDT switch. The DPDT switch has two poles that can simultaneously control two signal paths, eliminating the need for two separate switches while maintaining proper signal routing in both transmit and receive modes. This reduces device complexity, cost, and space requirements.
3Reliability
If a power amplifier and low noise amplifier are both used, then both transmit power and receive sensitivity are enhanced, but the device complexity and space requirements increase
Solution Approach 1:
The patent employs a universal amplifier circuit that can operate in dual modes: as a power amplifier during transmit mode to boost signal strength, and as a low noise amplifier during receive mode to amplify weak signals with minimal added noise. This single multi-functional amplifier replaces the need for separate dedicated power amplifier and low noise amplifier circuits, reducing device complexity and space requirements while maintaining both transmit power enhancement and receive sensitivity.
Solution Approach 2:
The amplifier circuit dynamically changes its operating characteristics based on the signal direction. During transmit mode, it operates with high gain and power amplification characteristics. During receive mode, it switches to low noise amplification characteristics. This dynamic operation allows a single amplifier to serve dual purposes, eliminating the need for separate dedicated amplifiers for each function.
4Power
If a power amplifier is always active, then transmit power is continuously enhanced, but power consumption during receive mode increases
Solution Approach 1:
The amplifier circuit dynamically changes its operating characteristics based on the signal direction. During transmit mode, it operates with high gain and power amplification characteristics. During receive mode, it switches to low noise amplification characteristics. This dynamic operation allows a single amplifier to serve dual purposes, eliminating the need for separate dedicated amplifiers for each function.
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
The solution reduces switching loss, cost, and space requirements by using a single switch and a dual-function amplifier, enhancing long-term efficiency and receive sensitivity while eliminating the need for two switches and separate power and low noise amplifiers.
Implementation Method 1
a transformer configured to convert a balanced transmit signal to an unbalanced transmit signal and to convert a second filtered receive signal to a balanced receive signal
Data Source
AI summary
An enhanced sensitivity radio frequency (RF) front end circuit includes a transformer configured to convert a balanced transmit signal to an unbalanced transmit signal and to convert a second filtered receive signal to a balanced receive signal. A switch in a first state receives the unbalanced transmit signal from the transformer and transfers the unbalanced transmit signal to an amplifier circuit and receives an amplified transmit signal from the amplifier circuit and transfers the amplified transmit signal to a filter. In a second state, the switch receives a first filtered receive signal from the filter and transfers the first filtered receive signal to the amplifier circuit and receives a second filtered receive signal from the amplifier circuit and transfers the second filtered receive signal to the transformer. In a first state, the amplifier circuit receives the unbalanced transmit signal from the switch and amplifies the unbalanced transmit signal to generate the amplified transmit signal, and in a second state, the amplifier circuit receives the first filtered receive signal from the switch and attenuates selected first frequencies to generate the second filtered receive signal.