Voltage Detector Using Diode-Connected Transistors for Chip Area Reduction
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Solution Overview
Problem
Conventional power voltage detectors in integrated circuits rely on comparators and reference voltages, which lead to inefficiencies such as wasted chip area and the need for multiple comparators, and are vulnerable to supply voltage fluctuations that can damage transistors.
Innovation Solution
A power voltage detector system that uses diode-connected transistors, hysteresis circuits, and a logic operation to determine if supply voltages have reached threshold levels, eliminating the need for traditional comparators and reference voltages, and includes an oscillator and divider to stabilize supply voltages and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional comparators and reference voltages are used for voltage detection, then voltage detection function is achieved, but chip area is wasted and device complexity increases
Solution Approach 1:
The patent extracts and eliminates the comparator and reference voltage generation circuits from the voltage detector, retaining only the essential detection function through a streamlined circuit that uses a voltage reference node and detection transistor without requiring traditional comparator architecture
Solution Approach 2:
The voltage reference node serves multiple functions: it provides the reference voltage for comparison, acts as a stable voltage source for the detection transistor, and enables hysteresis functionality through feedback, replacing multiple separate components with a single multi-functional element
2Adaptability or versatility
If multiple comparators are used for different supply voltages, then comprehensive voltage detection is achieved, but device complexity and chip area increase
Solution Approach 1:
A single voltage detector circuit is designed to handle multiple supply voltages (VDD1, VDD2, VDD3) by using separate detection transistors for each voltage rail that feed into a common evaluation logic structure, allowing one detector to perform the work of multiple detectors
Solution Approach 2:
The patent combines multiple voltage detection paths into a unified circuit architecture where detection transistors for different supply voltages are integrated with shared reference nodes and combined evaluation logic, reducing the total component count while maintaining detection of all voltage rails
3Measurement precision
If traditional comparator-based voltage detection is used, then voltage threshold comparison is achieved, but power consumption increases
Solution Approach 1:
The voltage detector uses periodic evaluation through an inverter-based feedback mechanism that only actively switches and consumes power when the supply voltage crosses the threshold, rather than continuously operating comparators that consume constant power
Solution Approach 2:
The patent replaces expensive, continuously-operating comparator circuits with simpler, event-driven detection transistors and inverters that only consume significant power during brief transition periods when voltage thresholds are crossed, using minimal power during stable states
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 solution effectively detects stable supply voltages without the need for comparators and reference voltages, reducing chip area usage and protecting transistors from voltage fluctuations, while also optimizing power consumption by turning off unnecessary components when supply voltages are stable.
Implementation Method 1
The voltage sensor circuit comprises a diode-connected transistor circuit, a resistance, and a hysteresis circuit
Implementation Method 2
The voltage sensor circuit comprises a diode-connected transistor circuit, a resistance, and a hysteresis circuit
Data Source
AI summary
A power voltage detector comprises voltage sensors for sensing supply voltages; and a logic. The logic combines the sensed supply voltages to generate a logic output indicative of whether the sensed supply voltages have met one or more predefined thresholds. Each of the voltage sensors has diode-connected transistors and passive resistance. The diode-connected transistors and the passive resistance are serially connected for generating an output, where the output is coupled to an input of the logic.