Constant-gm Power Detection for Multi-Domain Memory Reset
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Solution Overview
Problem
In embedded systems, power loss in one domain can cause floating or unknown signals to be sent to other domains, leading to mis-programming, damage, and DC leakage, necessitating a detection circuit to reset memory systems during abnormal power events.
Innovation Solution
A constant-transconductance (gm) power detection system generates reference voltages for multiple power domains, providing a power ready signal to indicate power status and reset systems, with low power and area consumption, suitable for multi-power domain memories like MRAM and flash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power detection circuit is implemented to detect power loss in embedded systems, then system reliability is improved by preventing mis-programming and damage, but device complexity increases due to additional detection circuitry
Solution Approach 1:
The power detection circuit utilizes the existing power supply voltage directly to generate detection signals without requiring external detection components. The circuit self-regulates by comparing the power supply voltage against internal reference levels, allowing the system to detect power loss conditions using its own internal resources, thereby minimizing additional complexity while maintaining reliability
Solution Approach 2:
The power detection circuit is designed to serve multiple functions: it detects power loss conditions, generates reset signals, and provides voltage level monitoring. By consolidating these functions into a single integrated circuit block, the design improves reliability through comprehensive monitoring while avoiding the complexity increase that would result from separate circuits for each function
2Adaptability or versatility
If multiple reference voltages are generated for multi-power domain detection, then adaptability is improved by accommodating different power domains, but device complexity increases due to additional reference voltage generation circuits
Solution Approach 1:
Multiple reference voltage generation circuits are merged into a single integrated reference voltage generator that produces multiple reference levels simultaneously. This unified approach allows the circuit to accommodate multiple power domains with different voltage levels while avoiding the complexity of separate reference voltage circuits for each domain
Solution Approach 2:
The reference voltage generator utilizes parameter changes in transistor operating modes to generate multiple reference voltages from a single input. By operating transistors in different regions (subthreshold, saturation, linear) and adjusting bias conditions, the circuit produces multiple reference voltage levels without requiring separate generation circuits for each voltage, thereby maintaining adaptability while controlling complexity
3Measurement precision
If constant transconductance biasing is used to improve detection accuracy, then measurement precision is improved by maintaining stable transconductance, but use of energy increases due to additional biasing circuits
Solution Approach 1:
The constant transconductance biasing circuit employs feedback mechanisms where the biasing transistors continuously adjust their operating points based on the actual transconductance requirements of the detection circuit. This feedback control maintains stable transconductance across varying conditions, improving detection accuracy while optimizing current consumption by only using the necessary bias current rather than fixed high current levels
Solution Approach 2:
The biasing circuit is designed to be dynamic rather than static, automatically adjusting bias current levels based on operating conditions. The constant transconductance is maintained through dynamic adjustment of bias voltages and currents, allowing the circuit to achieve high measurement precision while minimizing energy consumption by adapting bias levels to actual operational requirements rather than maintaining fixed high bias currents
Data Source
AI summary
In some aspects of the present disclosure, a power detection system is disclosed. In some aspects, the power detection system includes a constant-transconductance (gm) reference generator circuit receiving a power supply voltage. In some embodiments, the constant-gm reference generator circuit includes a first current mirror to provide a first reference voltage and a second current mirror to provide a second reference voltage. In some embodiments, the constant-gm reference generator circuit includes a power detection circuit coupled to the first current mirror to receive the first reference voltage. In some embodiments, the power detection circuit is coupled to the second current mirror to receive the second reference voltage. In some embodiments, the power detection is operated to receive the power supply voltage. In some embodiments, the power detection circuit is operated to provide an output voltage having one of two logic states at least based on the second reference voltage and the power supply voltage.