Integrated Amplifier Circuit With Shared DC and RF Output Path
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Solution Overview
Problem
Designing mobile terminals with multiple antennas poses challenges in minimizing size while avoiding crosstalk between different wireless applications, and existing amplifier circuits struggle to efficiently integrate DC supply and RF signals without degrading performance.
Innovation Solution
An integrated amplifier circuit that includes a DC-path comprising a first inductive element and a parallel resonant circuit with a second inductive element and a capacitive element, connected in series between the transistor-output terminal and the output, enabling efficient combination of DC supply and RF signal at the output without additional external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a LNA is placed directly behind a respective antenna to yield an active antenna, then the impact of the environment and PCB line loss can be eliminated, but the mobile terminal size becomes difficult to reduce due to additional terminals for DC power supply and control lines
Solution Approach 1:
The patent combines the DC power supply path and RF signal path into a single output terminal of the LNA. The DC supply terminal and RF output terminal are merged into one terminal that can simultaneously handle both DC voltage and RF signals, thereby reducing the number of external connections and minimizing the space required for antenna placement while maintaining the active antenna configuration's performance benefits
2Ease of operation
If additional external components are used to combine DC supply and RF signal at the output, then the DC supply can be provided, but the circuit complexity and space requirements increase
Solution Approach 1:
The LNA output terminal is designed to serve multiple functions simultaneously: it provides RF signal output, DC power supply to the antenna, and impedance matching. This multi-functional terminal eliminates the need for separate external components to combine DC and RF paths, simplifying the overall circuit design while maintaining ease of operation for power supply integration
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 simplifies circuit design, reduces the need for external components and space, and maintains RF performance by providing a high impedance for RF signals while allowing DC supply, suitable for both narrowband and broadband applications.
Implementation Method 1
a DC-path comprising a first inductive element and a parallel resonant circuit
Implementation Method 2
the parallel resonant circuit comprising a second inductive element and a capacitive element
Data Source
AI summary
An integrated amplifier circuit includes an input, an output, a transistor with a transistor-input terminal, the transistor-input terminal being coupled to the input, and a transistor-output terminal. The transistor-output terminal is coupled to the output by means of a DC-path. The DC-path includes a first inductive element and a parallel resonant circuit including a second inductive element and a first capacitive element. The first inductive element and the parallel resonant circuit are connected in series between the transistor-output terminal and the output.