RF Amplification Circuit With Coupled Coils for Multi-Band Tuning
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Solution Overview
Problem
Existing radio frequency transceivers are limited to supporting a fixed frequency band, making them incompatible with multi-band systems, which require the ability to operate across multiple frequency bands.
Innovation Solution
A radio frequency amplification circuit with multiple transmission paths, each comprising magnetically coupled coils and amplifiers, allows for adjustable conduction or cut-off of transmission paths to change the equivalent inductance and resonance frequency, enabling support for multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed frequency band is used in the radio frequency transceiver, then the circuit structure is simple, but the adaptability to multi-band systems is poor
Solution Approach 1:
The patent implements multi-band support by designing a single transmission path that can operate across multiple frequency bands through adjustable resonance frequencies. The amplifier and coil structure serves multiple functions by dynamically changing its resonance characteristics, eliminating the need for separate dedicated paths for each frequency band.
Solution Approach 2:
The patent employs dynamic adjustment of resonance frequency through controllable amplifiers that can be turned on or off to change the equivalent inductance and capacitance values. This dynamic reconfiguration allows the same hardware to adapt to different frequency bands without physical changes to the circuit structure.
2Adaptability or versatility
If multiple independent transmission paths are disposed to support multi-band systems, then the multi-band support is achieved, but the device size increases
Solution Approach 1:
The patent merges multiple transmission paths into a single integrated path where amplifiers and coils share common components. By using magnetically coupled coils with controllable amplifiers, the system combines the functionality of what would traditionally require separate independent paths, thereby reducing the overall transceiver size while maintaining multi-band capability.
3Adaptability or versatility
If additional components such as matching networks and filters are disposed for multi-band support, then the frequency band adaptability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent makes the amplifier and coil structure multi-functional by enabling it to serve as both the transmission path and the resonance tuning mechanism. The controllable amplifiers act as variable inductance elements, eliminating the need for separate matching networks and filters for each frequency band, thereby reducing component count and manufacturing cost.
4Adaptability or versatility
If the resonance frequency is changed by adjusting only the equivalent capacitor, then the frequency adjustment is simple, but the bandwidth becomes unstable
Solution Approach 1:
The patent changes both inductance and capacitance parameters simultaneously through the use of controllable amplifiers that affect both L and C values in the resonance circuit. By coordinating the adjustment of both parameters rather than changing only one, the system maintains a stable quality factor and thus stable bandwidth while achieving frequency adjustment.
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 allows the radio frequency amplification circuit to support a variety of multi-band systems by adjusting resonance frequencies while maintaining a stable bandwidth, reducing the size and cost of the transceiver by eliminating the need for multiple independent paths and additional components.
Implementation Method 1
Any two coils of the first coil, the second coil, the third coil, and the fourth coil are magnetically coupled to each other
Data Source
AI summary
This application discloses a radio frequency transceiver, and a communication device. A radio frequency amplification circuit includes two transmission paths disposed between a radio frequency input end and a radio frequency output end. The two transmission paths include a first transmission path and a second transmission path. The first transmission path includes a first amplifier, a first coil, a second coil, and a second amplifier that are sequentially coupled. The second transmission path includes a third amplifier, a third coil, a fourth coil, and a fourth amplifier that are sequentially coupled. Any two coils of the first coil, the second coil, the third coil, and the fourth coil are magnetically coupled. The first amplifier and the second amplifier is adjustable, or The third amplifier and the fourth amplifier is adjustable.