Variable-Resistance Mixer Circuit for Higher Output Power
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Solution Overview
Problem
Existing mixing devices using two cascoded transistors in series struggle to deliver high output power due to high internal resistance and voltage swing, which limits the available power in applications like telecommunications.
Innovation Solution
A mixing device utilizing a single variable resistance stage controlled by both signals, with a control stage driving resistance variation, reduces voltage swing and increases output power by using a combination of transistors and switches to manage signal mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two cascoded transistor stages are used for mixing, then the circuit area and energy consumption are reduced, but the output power is limited due to high internal resistance and high voltage swing
Solution Approach 1:
The mixing function is segmented into two distinct stages: a variable resistance stage that handles signal mixing with optimized power delivery, and a control stage that independently manages resistance variation. This segmentation allows each stage to be optimized for its specific function, resolving the contradiction between output power and device complexity.
Solution Approach 2:
A control stage is introduced as an intermediary between the input signals and the variable resistance stage. This control stage generates control signals that regulate the resistance of the variable resistance stage, enabling independent optimization of the mixing function and resistance control, thereby achieving higher output power without excessive complexity.
2Power
If high internal resistance transistors are used, then circuit area and energy consumption are reduced, but voltage swing increases reducing useful output power
Solution Approach 1:
The control stage acts as an intermediary that independently regulates the resistance of the variable resistance stage. This allows the variable resistance stage to maintain low voltage swing for high useful power while the control stage manages resistance variations, effectively decoupling the harmful voltage swing from the useful power delivery.
Solution Approach 2:
The invention changes the operating parameters by using a variable resistance stage with resistance controlled by a separate control stage. This parameter control approach allows optimization of both voltage swing and resistance independently, achieving low voltage swing conditions that maximize useful output power.
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 provides a higher output power level with reduced voltage swing, enabling more efficient power delivery in frequency-modulated signal mixing applications.
Implementation Method 1
a variable resistance stage controlled by the second signal and designed to be connected between a first and a second potential to deliver the output signal
Implementation Method 2
A control stage is configured also to drive the resistance variation of the variable resistance stage according to the first signal
Data Source
AI summary
A first and a second signal (base band and local oscillator), respectively modulated to a first and a second frequency, are mixed to deliver an output signal at a frequency obtained by combining the first and second frequencies. The mixing is accomplished through a variable resistance stage controlled by the second signal and connected between a first and a second potential to deliver the mixed output signal. A control stage is configured to drive the resistance variation of the variable resistance stage according to the first signal.