RF Amplifier Switching Paths for Low-Voltage Dynamic Range
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Solution Overview
Problem
Current RF circuits face challenges in achieving a wide dynamic range under low voltage operation while covering a wide frequency range, leading to signal loss and increased power consumption, which is incompatible with advanced modulation systems and high-data-rate systems.
Innovation Solution
An amplifying circuit with a switching mechanism that uses impedance converting circuits connected by a first-type switching circuit with signal cutting-off function and a second-type switching circuit with signal attenuating function, controlled by a control signal generating circuit to select the appropriate signal path for amplification, minimizing leakage and maintaining signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single circuit is used to cover multiple frequency bands, then the device complexity is reduced, but the gain in desired frequency bands is sacrificed
Solution Approach 1:
The invention divides the amplification function into multiple parallel amplifiers (first amplifier for first frequency band, second amplifier for second frequency band) instead of using a single amplifier. Each amplifier is optimized for its specific frequency band, thereby maintaining high gain while covering multiple bands. The switching circuit selectively activates the appropriate amplifier based on the input signal frequency.
Solution Approach 2:
The invention employs a switching circuit that dynamically selects which amplifier to activate based on the frequency of the input signal. The switching circuit responds to control signals that indicate the desired frequency band, thereby dynamically configuring the amplification path to match the operating conditions and optimize gain.
2Adaptability or versatility
If parallel-connected amplifiers with matching circuits are used for respective frequencies, then multiple frequency bands are covered, but the device complexity increases
Solution Approach 1:
The invention combines multiple amplifiers and their respective matching circuits into a single integrated amplification circuit unit. The parallel-connected amplifiers share common input and output terminals, and the switching circuit unifies the selection mechanism. This merging approach reduces overall device complexity compared to having separate independent circuits for each frequency band.
Solution Approach 2:
The invention creates a universal amplification circuit that can handle multiple frequency bands through a single integrated structure. The switching circuit acts as a universal control mechanism that routes signals to the appropriate amplifier based on frequency, making the entire circuit adaptable to different operating conditions without requiring separate dedicated circuits.
3Use of energy by stationary object
If the amplifier operates under low voltage, then power consumption is reduced, but the dynamic range is narrowed
Solution Approach 1:
The invention applies different operating characteristics to different amplifiers within the same circuit. Each amplifier can be optimized for its specific frequency band while operating at low voltage, allowing the system to maintain wide dynamic range across multiple bands without requiring high overall power consumption. The switching circuit ensures that only one amplifier operates at a time, minimizing total power usage.
Data Source
AI summary
The present invention is aimed at realizing an amplifying circuit whose chip size is prevented from being significantly increased even if the number of compatible frequencies increases, and which has a wide dynamic range when it operates under a low voltage. The amplifying circuit includes a plurality of impedance converting circuits connected to each other by a switching circuit of a first type having a signal cutting-off function, a switching circuit of a second type connected to a path branched from an input side of the switching circuit of the first type, the switching circuit of the second type having a signal cutting-off function, amplifiers connected respectively to an output side of one of the impedance converting circuits in a final stage and to an output side of the switching circuit of the second type, and a control signal generating circuit for controlling connection/disconnection between said switching circuit of the first type and said switching circuit of the second type; wherein either one of the paths is selected to input a signal to one of the amplifiers.