Multi-Purpose Capacitor Attenuation Circuit Reducing Parasitic Effects
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Solution Overview
Problem
Conventional capacitive attenuation circuitry requires multiple capacitors and complex switching mechanisms, leading to increased circuit complexity, parasitic capacitance, and inefficiencies in RF signal attenuation.
Innovation Solution
The proposed variable capacitive attenuation circuitry employs multi-purpose capacitors that can function as either shunt or series capacitors, reducing the number of required components and eliminating the need for voltage bias and additional switches, thereby simplifying the circuit and minimizing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional capacitive attenuation circuitry uses multiple series capacitors and shunt capacitors with switching mechanisms, then variable attenuation can be achieved, but circuit complexity increases and parasitic capacitance is introduced
Solution Approach 1:
Each capacitor in the attenuation circuit is configured to serve dual functions: it can operate as a series capacitor during attenuation modes and as a shunt capacitor during other modes. This is achieved through switching circuitry that reconfigures the capacitive elements, allowing the same physical capacitor to fulfill different roles in the capacitive divider arrangement, thereby reducing the total number of capacitors needed while maintaining variable attenuation capability
Solution Approach 2:
The patent combines the functions of series capacitors and shunt capacitors into a single set of multi-purpose capacitive elements. By merging these traditionally separate components into one unified set that can be dynamically reconfigured, the circuit achieves variable attenuation without requiring distinct series and shunt capacitor banks, thus simplifying the overall circuit architecture
2Measurement precision
If multiple capacitors are used to achieve variable attenuation, then attenuation precision can be improved, but circuit area increases
Solution Approach 1:
By configuring capacitors to serve dual purposes as both series and shunt elements depending on the attenuation setting, the circuit achieves multiple discrete attenuation levels using fewer physical components. This multi-functional approach allows precise variable attenuation to be achieved without proportionally increasing circuit area, as each capacitor contributes to multiple attenuation states rather than requiring dedicated capacitors for each level
3Reliability
If voltage bias is applied to floating capacitors to reduce nonlinearity, then signal quality improves, but device complexity and power consumption increase
Solution Approach 1:
The patent eliminates the need for voltage bias application to floating capacitors by ensuring that all capacitive elements remain continuously connected to the signal path or ground through the capacitive divider configuration. This extraction of the voltage bias requirement removes the associated complexity and power consumption while maintaining signal quality, as capacitors are never left in a floating state that would require biasing
4Adaptability or versatility
If conventional switching mechanisms are used to change capacitor configurations, then attenuation settings can be changed, but parasitic capacitance increases
Solution Approach 1:
By merging the series and shunt capacitor functions into a single reconfigurable set of capacitive elements, the patent reduces the number of switching transitions required to change attenuation settings. This consolidation minimizes the cumulative parasitic capacitance introduced by multiple switches, as fewer switching operations are needed to achieve the same attenuation variability compared to conventional separate series and shunt capacitor configurations
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 configuration allows for flexible attenuation settings with reduced circuit area and improved signal loss characteristics, enabling efficient attenuation of RF signals across various frequency bands without floating capacitors, thus enhancing the overall performance of RF receiver systems.
Implementation Method 1
variable capacitive attenuation circuitry acts as a capacitive divider that attenuates an incoming RF signal applied to RF signal input 120 by an amount that is equal to the selected series capacitance divided by the sum of the selected series capacitance and the selected shunt capacitance
Data Source
AI summary
Variable capacitive attenuation circuitry and associated methods are disclosed that may be implemented to employ a plurality of multi-purpose capacitors that may be selectably coupled together in different configurations to form a capacitive divider having different respective attenuation properties. In a particular embodiment, each of the capacitors of the disclosed capacitive attenuation circuitry may be selectably coupled to an RF reference as either a shunt capacitor or coupled in series between an RF signal input and an attenuated RF signal output as a series capacitor, thus forming a capacitive divider having selected attenuation properties. The disclosed variable capacitive attenuation circuitry may be advantageously utilized to attenuate an input RF signal and to provide a resulting attenuated RF output signal, for example, in the front end of RF receiver circuitry.