Voltage Current Converter for Variable Filter Design
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Solution Overview
Problem
Existing multi-mode transceivers face challenges in achieving steep cut-off filter characteristics with a small area, as higher-order filters require numerous capacitive elements, increasing space and complexity.
Innovation Solution
A voltage current converter with sampling and holding units, individual voltage current converting units, and a controlling unit that adds output currents to achieve finite or infinite impulse response filter characteristics, allowing for variable filter configurations with reduced area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher-order filter is configured to obtain steep cut-off characteristics, then filter performance is improved, but the number of capacitive elements increases and area becomes large
Solution Approach 1:
The patent changes the fundamental operating parameters by using a voltage current converter with sampling frequency control instead of traditional capacitive filter elements. By adjusting the sampling frequency of the voltage current converter, the filter characteristics including cut-off frequency and order can be varied without changing the physical structure or number of components, thus achieving steep cut-off characteristics with reduced area
Solution Approach 2:
The patent replaces the mechanical/electrical system of multiple capacitive elements with an electronic control system based on voltage current conversion and sampling. The filter characteristics are controlled through electronic parameters (sampling frequency, conversion gain) rather than physical component arrangements, eliminating the need for numerous capacitors while maintaining or improving filter performance
2Reliability
If a higher-order filter is configured to obtain steep cut-off characteristics, then filter performance is improved, but device complexity increases
Solution Approach 1:
The voltage current converter serves multiple functions: it acts as both the filter element and the control element. By adjusting the sampling frequency and conversion gain parameters of this single device, different filter orders and cut-off characteristics can be achieved, eliminating the need for multiple dedicated filter components and reducing overall device complexity
Solution Approach 2:
The patent introduces dynamic control through variable sampling frequency and adjustable conversion gain. The filter characteristics are not fixed by physical structure but can be dynamically changed through parameter adjustment, allowing the same hardware configuration to adapt to different filtering requirements without increasing 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
The solution enables the realization of variable filters with steep cut-off characteristics in a compact form, maintaining efficiency and flexibility in bandwidth adjustment through control of sampling frequency.
Implementation Method 1
one or more sampling and holding units, each of which has a function of sampling and holding the inputted voltage
Implementation Method 2
one or more individual voltage current converting units, each of which outputs a current corresponding to the voltage, sampled and held by said sampling and holding unit
Data Source
AI summary
It is possible to provide a voltage-current converter which can realize a variable filter having a steep cut-off characteristic with a small area. The voltage-current converter includes: one or more sampling/holding units for sampling an inputted voltage and holding the sampled voltage; one or more separate voltage-current conversion units for outputting a current corresponding to the voltage held by the sampling/holding units; and a control unit for controlling the timing of the sampling and holding of the inputted voltage by the sampling/holding units.