Publication
A 0.5 V 2.5 mu W/MHz Microcontroller with Analog-Assisted Adaptive Body Bias PVT Compensation with 3.13 nW/kB SRAM Retention in 55 nm Deeply-Depleted Channel CMOS
Abstract
Microcontroller systems operating at low supply voltage in near- or sub-threshold regime suffer both from increased effects of PVT (Process, Voltage, Temperature) variation and from a larger share of leakage on overall power due to the reduced frequency. We show how to overcome these effects for the core and memory by exploiting the strong body factor of deeply-depleted channel CMOS at 0.5 V, compensating frequency over PVT to +/- 6%, achieving 30x frequency and 20x leakage scaling in a 2.56 mu W/MHz 32 bit RISC Core with 3.13 nW/kB 2.5 mu W/MHz SRAM. Frequency-leakage configurability in core and SRAM through adaptive body bias at fixed supply voltage is implemented using a novel automatic analog-assisted I-ON-controlled approach.
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Ontological neighbourhood
Related concepts (29)
Microcontroller
A microcontroller (MCU for microcontroller unit, also MC, UC, or μC) is a small computer on a single VLSI integrated circuit (IC) chip. A microcontroller contains one or more CPUs (processor cores) along with memory and programmable input/output peripherals. Program memory in the form of ferroelectric RAM, NOR flash or OTP ROM is also often included on chip, as well as a small amount of RAM. Microcontrollers are designed for embedded applications, in contrast to the microprocessors used in personal computers or other general purpose applications consisting of various discrete chips.
Moore's law
Moore's law is the observation that the number of transistors in an integrated circuit (IC) doubles about every two years. Moore's law is an observation and projection of a historical trend. Rather than a law of physics, it is an empirical relationship linked to gains from experience in production. The observation is named after Gordon Moore, the co-founder of Fairchild Semiconductor and Intel (and former CEO of the latter), who in 1965 posited a doubling every year in the number of components per integrated circuit, and projected this rate of growth would continue for at least another decade.
MOSFET
The metal-oxide-semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. A metal-insulator-semiconductor field-effect transistor (MISFET) is a term almost synonymous with MOSFET.
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