Adaptive Reference Voltage Circuit for Narrow Pulse Width Support
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Solution Overview
Problem
Conventional HDD preamplifiers face challenges in supporting narrow pulse widths due to fixed voltage regulators, leading to increased circuit area and power consumption when attempting to meet requirements like 130 picosecond pulse widths for write pulse overshoot.
Innovation Solution
An adaptive power supply with a reference voltage circuit that dynamically tracks the on-resistance and threshold voltage of field effect transistors in CMOS circuitry, providing a variable voltage to the data path, allowing for improved passage of narrow pulse widths without increasing CMOS inverter size or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed voltage regulators are used in conventional preamplifiers, then the circuit design is simple, but the preamplifier cannot support narrow pulse widths like 130 picosecond pulse widths for write pulse overshoot
Solution Approach 1:
The patent applies dynamics by replacing fixed voltage regulators with adaptive power supply circuits that dynamically adjust supply voltages based on real-time detection of transistor operating conditions. The voltage regulation circuitry adapts to changing PVT conditions and pulse width requirements, enabling support for narrow pulse widths while maintaining circuit functionality.
Solution Approach 2:
The patent changes voltage parameters dynamically by adjusting supply voltages to different levels based on detected transistor states. The adaptive power supply modifies voltage parameters in response to PVT variations and pulse width requirements, allowing the preamplifier to support narrow pulse widths without increasing circuit area.
2Reliability
If the size of CMOS inverters is increased to meet narrow pulse width requirements, then the pulse width support capability improves, but the circuit area and power consumption of the preamplifier increase unduly
Solution Approach 1:
Instead of increasing inverter size, the patent changes voltage parameters by implementing adaptive power supply that adjusts supply voltages based on transistor operating conditions. This allows narrow pulse width support through voltage adaptation rather than physical size increase, maintaining compact circuit area.
Solution Approach 2:
The patent uses voltage copying and adaptation mechanisms where the adaptive power supply creates voltage levels that mirror the actual transistor operating conditions. This allows the circuit to respond appropriately to narrow pulse width requirements without requiring proportionally larger physical components.
3Reliability
If the size of CMOS inverters is increased to meet narrow pulse width requirements, then the pulse width support capability improves, but the power consumption of the preamplifier increases unduly
Solution Approach 1:
The patent reduces power consumption by dynamically changing voltage parameters based on actual circuit needs. The adaptive power supply adjusts supply voltages to match transistor operating conditions, avoiding unnecessary power consumption that would result from operating larger inverters at full capacity, while still achieving narrow pulse width support.
Solution Approach 2:
The patent implements dynamic power adjustment where the power supply voltage adapts in real-time to circuit requirements. This dynamic approach allows the preamplifier to support narrow pulse widths only when needed, reducing overall power consumption compared to static designs that must accommodate worst-case requirements continuously.
4Ease of operation
If fixed reference voltage circuits are used, then the circuit design is simple, but the write drivers cannot easily pass very narrow pulse widths under PVT variations
Solution Approach 1:
The patent applies dynamics to the reference voltage circuit by making it adaptive rather than fixed. The reference voltage dynamically tracks transistor characteristics under PVT variations, allowing write drivers to easily pass narrow pulse widths. The circuit complexity is managed through integrated design where the adaptive reference voltage works seamlessly with the power supply and driver circuits.
Solution Approach 2:
The patent implements feedback mechanisms where the adaptive power supply and reference voltage circuit continuously monitor transistor operating conditions and adjust accordingly. This feedback enables the system to maintain optimal operation for narrow pulse width passage under varying PVT conditions, improving ease of operation while managing circuit complexity through intelligent control.
Data Source
AI summary
Interface circuitry of a storage device or other type of processing device comprises at least one data path, and an adaptive power supply configured to provide a variable supply voltage to the data path. The adaptive power supply comprises a reference voltage circuit having a plurality of field effect transistors collectively configured to provide a variable reference voltage, with different ones of the field effect transistors being biased into different operating regions. For example, a first subset of the field effect transistors may each be biased into a linear region such that the variable reference voltage tracks variations in on-resistance of one or more corresponding field effect transistors of the data path, and a second subset of the field effect transistors may each be biased into a saturation region such that the variable reference voltage tracks variations in threshold voltage of the corresponding field effect transistors of the data path.