Charge Pump Oscillator Switching to Prevent Runt Pulses
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Solution Overview
Problem
As memory devices increase in size and complexity, charge pumps face challenges in efficiently providing higher voltages while managing power consumption and reliability, particularly due to the generation of short-duration high currents and the potential for runt pulses during mode transitions.
Innovation Solution
The implementation of a charge pump system with an oscillation selection circuit and mode transition control circuit that regulates the oscillator signal by selecting between high and low frequency clock signals based on operational modes, preventing runt pulses by ensuring synchronized binary states of the FastOsc and SlowOsc signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charge pumps operate at high frequency to meet increasing memory speed demands, then productivity is improved, but power consumption increases and reliability deteriorates due to short-duration high currents
Solution Approach 1:
The charge pump oscillator dynamically adjusts its operating frequency based on memory device speed requirements. The system transitions between low frequency mode for standard operations and high frequency mode for enhanced performance, allowing the charge pump to optimize between power consumption and productivity based on actual operational demands rather than operating at fixed high frequency continuously
Solution Approach 2:
The system changes the operating frequency parameter of the charge pump oscillator based on operational mode. By switching between different frequency parameters (low vs. high), the system adapts power consumption levels to match productivity requirements, reducing energy loss during normal operations while maintaining the ability to deliver high performance when needed
2Use of energy by moving object
If charge pumps switch between operational modes to manage power consumption, then power management is improved, but reliability deteriorates due to runt pulses generated during mode transitions
Solution Approach 1:
The system performs preliminary synchronization of the fast oscillator and slow oscillator phases before transitioning between operational modes. By ensuring both oscillators are synchronized to the same phase state before mode switching occurs, the system prevents the generation of runt pulses that would otherwise compromise output stability during transitions, thereby maintaining reliability while enabling power management
Solution Approach 2:
The system monitors the phase relationship between fast and slow oscillators and uses this feedback to control mode transitions. The feedback mechanism ensures that mode switching only occurs when oscillators are properly synchronized, preventing unreliable output transitions while still allowing the system to switch between power consumption modes as needed
3Adaptability or versatility
If charge pumps provide higher voltages for memory operations, then functionality is improved, but device complexity increases to manage voltage regulation and current control
Solution Approach 1:
The charge pump oscillator is designed to perform multiple functions: it generates higher voltages for memory operations, dynamically adjusts frequency based on performance needs, and incorporates built-in phase synchronization for reliable mode transitions. By integrating these multiple functions into a single oscillator circuit rather than separate components, the system achieves enhanced adaptability while managing device complexity
Data Source
AI summary
A memory device includes a plurality of memory cells and first circuitry coupled the plurality of memory cells, wherein the first circuitry is configured to perform a memory operation on at least one memory cell of the plurality of memory cells. The memory device also includes a charge pump coupled to the first circuitry, wherein the charge pump comprises a pump oscillator configured to generate an oscillator signal having only pulses with a width above a predetermined threshold pulse width and a pump core configured to receive the oscillator signal and a first electrical power signal at a first voltage, generate a second electrical power signal at a second voltage based upon the oscillator signal and the first voltage.