RF Power Amplifier Bias Control for Mixed-Bandwidth Signals
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Solution Overview
Problem
Existing radio frequency circuits that simultaneously handle signals from different mobile communication systems or frequency bands require multiple circuit elements, leading to increased size and complexity, which is not efficiently addressed by current technologies.
Innovation Solution
A radio frequency circuit design that includes a single power amplifier capable of selectively amplifying radio frequency signals with different bandwidths by applying distinct bias signals based on the input signal's bandwidth, using a configuration with switches and separate bias power supplies to optimize amplification performance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple amplifiers are disposed in the primary circuit and secondary circuit to handle different communication systems or frequency bands, then the radio frequency circuit can simultaneously transfer multiple signals, but the number of circuit elements increases, resulting in an increase in the size of the radio frequency circuit
Solution Approach 1:
The patent applies a single amplifier that can operate in multiple modes by switching between different bias signals. The amplifier is designed to handle both wideband signals (for 5G NR) and narrowband signals (for 4G LTE) by receiving different bias conditions, making one component perform the function of what would traditionally require multiple amplifiers. This reduces the overall circuit size while maintaining the capability to simultaneously transfer multiple signals across different communication systems and frequency bands.
2Adaptability or versatility
If multiple amplifiers are disposed in the primary circuit and secondary circuit to handle different communication systems or frequency bands, then the radio frequency circuit can simultaneously transfer multiple signals, but the number of circuit elements increases
Solution Approach 1:
The amplifier is designed as a universal component that can serve multiple communication systems (4G LTE and 5G NR) and handle different frequency bands by switching between different bias signals. This multi-functional design reduces the number of circuit elements from multiple amplifiers to a single amplifier, thereby reducing device complexity while maintaining adaptability.
Solution Approach 2:
The patent employs dynamic bias signal switching to adapt the amplifier's operating characteristics in real-time. By dynamically changing the bias signal based on the input signal type (wideband or narrowband), the amplifier can optimally handle different communication systems and frequency bands. This dynamic adaptation eliminates the need for multiple static amplifiers, reducing circuit element count while maintaining versatility.
3Area of stationary object
If a single amplifier is used with different bias signals for different bandwidths, then the number of circuit elements is reduced and the circuit is miniaturized, but the amplifier must be capable of selective amplification based on bandwidth
Solution Approach 1:
The patent uses dynamic bias signal switching controlled by a control signal to adapt the amplifier's operating mode. The bias switching unit receives control signals that indicate whether the input signal is a wideband signal (for 5G NR) or a narrowband signal (for 4G LTE), and accordingly switches between a first bias signal and a second bias signal. This dynamic control mechanism enables a single amplifier to replace multiple amplifiers, achieving circuit miniaturization while managing the complexity through intelligent control rather than hardware multiplication.
Data Source
AI summary
A radio frequency circuit includes a power amplifier configured to selectively amplify one of a first radio frequency signal and a second radio frequency signal that have different bandwidths, and when the first radio frequency signal is input to the power amplifier, a first bias signal is applied to the power amplifier, and when the second radio frequency signal is input to the power amplifier, a second bias signal different from the first bias signal is applied to the power amplifier.