Window Function Integrator Using Impedance Modulation for Lower ADC Load
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Solution Overview
Problem
Existing window function processing modules in communication and capacitive touch systems suffer from increased power consumption and complexity due to high sampling rates required to handle sidelobe noise, which is not effectively managed by current analog-to-digital converters.
Innovation Solution
An analog integrating circuit with an adjustable impedance module, controlled by a control unit, adjusts integration gains at different time intervals to apply a window function, reducing noise from sidelobes and enhancing Signal-to-Noise Ratio (SNR) without the need for high sampling rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digital integrator is used to apply window function, then the sidelobe noise is suppressed and SNR is enhanced, but the output frequency becomes high requiring high sampling rate ADC which increases power consumption and circuit complexity
Solution Approach 1:
The patent replaces the digital integrator (electronic/digital system) with an analog integrator circuit that directly applies the window function in the analog domain. This substitution eliminates the need for high-frequency digital processing and high sampling rate ADC, thereby reducing circuit complexity and power consumption while maintaining the SNR enhancement benefit through analog window function application.
Solution Approach 2:
The patent changes the operating domain from digital to analog by adjusting the integration gain of the analog integrator according to the window function. This parameter change allows the system to achieve the same noise suppression effect without requiring high sampling rates, thus resolving the contradiction between SNR enhancement and circuit complexity.
2Reliability
If a digital integrator is used to apply window function, then the sidelobe noise is suppressed and SNR is enhanced, but the sampling rate requirement increases leading to higher power consumption
Solution Approach 1:
The patent substitutes the digital processing path with an analog integrator circuit that performs window function application directly in the analog domain. This substitution eliminates the need for high sampling rate ADC and subsequent digital processing, significantly reducing power consumption while maintaining the SNR enhancement through analog windowing.
Solution Approach 2:
The patent changes the integration gain parameter of the analog integrator dynamically according to the window function requirements. This parameter modulation allows the system to achieve noise suppression without requiring high sampling rates, thereby reducing the power consumption associated with high-speed ADC and digital processing.
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 reduces the power consumption and complexity of the overall circuit by performing window function operations in the analog domain, effectively suppressing sidelobe noise and enhancing the SNR without demanding high sampling rates.
Implementation Method 1
an integrating circuit configured to receive an integrating input signal to generate an integrating output signal, where the integrating circuit includes an operational amplifier; an integrating capacitor coupled to an output terminal and a first input terminal of the operational amplifier
Implementation Method 2
an adjustable impedance module coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit, wherein the adjustable impedance module is controlled by at least one control signal to adjust an impedance value of the adjustable impedance module, and the impedance value is related to an integration gain of the integrating circuit
Data Source
AI summary
The present application provides a window function processing module including an integrating circuit, configured to receive an integrating input signal, the integrating circuit comprising an operational amplifier; an integrating capacitor, coupled to an output terminal and a first input terminal of the operational amplifier; and an adjustable impedance module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit, wherein the adjustable impedance module is controlled by at least one control signal to adjust an impedance value of the adjustable impedance module; and a control unit, coupled to the integrating circuit, configured to generate the at least one control signal according to a window function, to adjust the integration gain of the integrating circuit, such that the integrating output signal is related to an operation result of the integrating input signal and the window function.