Differencing Comparator with Integrated Charge Pump
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Solution Overview
Problem
Conventional differential comparators are limited in their ability to compare differential signals against programmable or fixed thresholds, especially when the input common-mode voltage is below the ground potential, requiring additional power supply voltages and complex power configurations, which is not suitable for low-power applications.
Innovation Solution
The development of differencing comparators that include a transconductance circuit to compare differential input signals to a programmable or fixed threshold, utilizing a charge pump to generate a negative supply voltage, allowing the comparators to operate with input signals below ground potential without an external negative power supply, and incorporating a processor to generate control signals for motor control applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional differential comparators are used to compare differential signals against thresholds, then the comparison function is achieved, but additional power supply voltages and complex power configurations are required when input common-mode voltage is below ground potential
Solution Approach 1:
The patent combines the positive and negative supply voltage generation into a single charge pump circuit integrated within the comparator. The charge pump generates both the negative supply voltage (when needed) and works with the positive supply voltage, eliminating the need for separate external negative voltage sources and simplifying the overall power configuration.
Solution Approach 2:
The comparator is designed to generate its own negative supply voltage internally using the charge pump circuit when the input common-mode voltage is below ground potential. This self-service capability eliminates the need for external negative power supply connections, reducing system complexity while maintaining the ability to handle differential signals with thresholds.
2Adaptability or versatility
If conventional differential comparators are used with input signals below ground potential, then the comparison function is achieved, but power consumption increases due to additional power supply requirements
Solution Approach 1:
The charge pump circuit is integrated within the comparator structure, combining the functions of voltage generation and signal comparison. This integration reduces the overall power consumption by eliminating the need for separate external voltage generation circuits and reducing the number of active components that require power.
Solution Approach 2:
The comparator generates its own negative supply voltage internally using the charge pump only when needed (when input common-mode voltage is below ground potential). This on-demand voltage generation approach minimizes power consumption by avoiding continuous operation of external voltage sources and reducing the energy required for voltage conversion.
3Adaptability or versatility
If external negative power supply is used, then the comparator can handle input signals below ground potential, but the power supply configuration becomes complex and unsuitable for low-power applications
Solution Approach 1:
The patent merges the negative voltage generation function into the comparator itself through an integrated charge pump circuit. This eliminates the need for separate external negative power supply connections and simplifies the power configuration to just the standard positive supply voltage, making the device easier to operate while maintaining the ability to handle input signals below ground potential.
Solution Approach 2:
The comparator is designed to be self-sufficient by generating its own negative supply voltage internally when needed. This self-service capability eliminates the need for external negative power supply connections, significantly simplifying the power supply configuration and making the device suitable for low-power applications while maintaining adaptability to handle differential signals with thresholds.
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
Enables flexible and efficient signal processing in microcontrollers and motor control systems by directly comparing differential signals against thresholds, reducing power consumption and simplifying power supply configurations, suitable for low-power applications.
Implementation Method 1
The MCU further includes a charge pump. The charge pump generates a negative supply voltage and to provide the negative supply voltage to the at least one differencing comparator.
Data Source
AI summary
An apparatus includes an integrated circuit (IC). The IC includes a differencing comparator. The differencing comparator receives a differential input signal. The differencing comparator compares the differential input signal to a threshold value. The differencing comparator includes a transconductance circuit coupled to receive the differential input signal and to provide a differential output signal.