Modular Radio Transmitter Amplifier With Resonant Signal Combining
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Solution Overview
Problem
CMOS transistors in amplifiers face limitations such as lower trans-conductance, breakdown voltage, and passive component performance, leading to higher current consumption, limited power supply, and challenges in wide power tuning range design, which affect the efficiency and integration level of radio transmitter amplifiers.
Innovation Solution
A modular amplifier structure with gain-controlled amplifier sub-units and a combining circuit that uses CMOS transistors, where amplifier sub-units are selectively activated or disabled by control signals to adjust amplification, and a combining circuit with capacitors and a coil provides a series resonance effect for enhanced voltage gain without excessive passive component use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If CMOS transistors are used in amplifiers, then integration level and manufacturing ease are improved, but trans-conductance and breakdown voltage decrease leading to higher current consumption and limited power supply
Solution Approach 1:
The amplifier is divided into multiple amplifier sub-units (first, second, third, fourth sub-units) that can be selectively activated or disabled. This segmentation allows the system to use only the necessary number of sub-units based on the desired output power level, thereby reducing overall current consumption while maintaining CMOS integration benefits.
Solution Approach 2:
The amplifier employs dynamic control through activation signals that enable or disable specific amplifier sub-units based on the required output power. This dynamic adjustment optimizes current consumption by activating only the necessary sub-units, resolving the contradiction between integration and energy efficiency.
2Power
If more amplifier sub-units are activated to increase output power, then amplification capability is improved, but current consumption and power supply requirements increase
Solution Approach 1:
The system uses partial action by activating only the necessary number of amplifier sub-units based on the desired output power level. Instead of always operating at full capacity, the controller activates exactly the number of sub-units needed, avoiding excessive power consumption while achieving the required amplification.
Solution Approach 2:
The system changes operational parameters by selectively enabling or disabling amplifier sub-units based on the required output power level. This parameter change allows the amplifier to operate efficiently across different power levels, matching power consumption to actual amplification needs.
3Adaptability or versatility
If traditional amplifier designs are used to achieve wide power tuning range, then power flexibility is improved, but device complexity and passive component requirements increase
Solution Approach 1:
The amplifier is segmented into multiple identical sub-units with standardized input and output interfaces. This segmentation enables wide power tuning range by simply activating different combinations of sub-units, avoiding the need for complex passive components and maintaining design simplicity.
Solution Approach 2:
Each amplifier sub-unit is designed to be universal and interchangeable, performing the same function with standardized interfaces. This universality allows the system to achieve wide power tuning range through simple activation control rather than complex component design, reducing overall device complexity.
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 enhances amplification efficiency, reduces power consumption, and maintains output impedance while minimizing signal leakage, achieving higher voltage gain and flexible power control with minimal passive component usage.
Implementation Method 1
a combining circuit with capacitors and a coil provides a series resonance effect for enhanced voltage gain
Data Source
Figure 1~5
Figure 3~4B
AI summary
There is provided inter-alia provided a circuit for combining at least two input signals received from at least two parallel amplifier sub-units of a modular amplifier structure, wherein each of the at least two input signals includes a positive component and a negative component, the circuit comprising: - a first capacitor (C3) provided in a signal path of a positive component of a first input signal of the at least two input signals; - a second capacitor (C4) provided in a signal path of a negative component of the first input signal of the at least two input signals; - a third capacitor (C5) provided in a signal path of a positive component of a second input signal of the at least two input signals; - a fourth capacitor (C6) provided in a signal path of a negative component of the second input signal of the at least two input signals; - a coil (L); wherein the first capacitor (C3) and the third capacitor (C5) are coupled in order to combine the positive components of the first input signal and the second input signal, wherein the second capacitor (C4) and the fourth capacitor (C6) are coupled in order to combine the negative components of the first input signal and the second input signal, and wherein the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor in conjunction with the coil function as a resonance circuit.