Glossary
Analog IC Design Glossary
The vocabulary of analog chip design, explained in plain English by the team building Samurai, the AI-native analog IC design platform.
Analog IC design
Analog IC design is the discipline of creating integrated circuits that process continuous signals — voltages and currents — rather than digital ones and zeros. It covers blocks like references, amplifiers, and power management, and has historically resisted automation because performance depends on careful transistor sizing, biasing, and layout. Samurai automates the schematic-level portion of this flow: from a plain-English specification to a simulated, verified netlist.
Netlist
A netlist is a text description of a circuit: the list of components — transistors, resistors, capacitors — and how their terminals connect. It is the canonical machine-readable form of a schematic and the input format for SPICE simulators. Samurai generates hierarchical netlists directly from natural-language specifications, and can import netlists you already have.
Schematic
A schematic is the visual diagram of a circuit, drawn with standard symbols for each device and wires for their connections. It is how analog engineers read, review, and reason about a design. Samurai renders schematics automatically from generated or imported netlists, so every design is inspectable at a glance.
SPICE simulation
SPICE (Simulation Program with Integrated Circuit Emphasis) is the industry-standard way to predict how a circuit will behave before it is manufactured. It solves the circuit's equations to find DC operating points, AC frequency response, and transient (time-domain) behaviour. Samurai runs SPICE automatically on every generated design and iterates until the simulated results converge on the specification.
GDSII
GDSII is the file format used to describe the physical layout of a chip — the exact geometric shapes that will be printed onto silicon, layer by layer. It is the final artifact handed to a foundry at tapeout. Samurai currently outputs verified schematics and netlists, and is working toward GDSII export to close the loop from specification to manufacturable layout.
Tapeout
Tapeout is the milestone when a chip design is finalized and its layout data is sent to a foundry for fabrication. After tapeout, changes are expensive or impossible, so designs are verified exhaustively beforehand. Reducing the number of design iterations that reach this costly stage is one of the core motivations behind automated, simulation-verified design.
PDK (process design kit)
A process design kit is the package a semiconductor foundry provides to describe its manufacturing process: transistor models, design rules, and standard device libraries. A circuit must be designed against a specific PDK to be manufacturable on that process. Samurai supports uploading PDKs into the platform, so generated designs can target real foundry processes.
Bandgap voltage reference
A bandgap voltage reference is a circuit that produces a stable reference voltage — classically around 1.2 V — that stays nearly constant across temperature and supply variations. It works by summing two internal voltages with opposite temperature behaviour so their drifts cancel. Bandgaps sit at the heart of nearly every mixed-signal chip and are one of the circuit families Samurai designs and verifies.
PSRR (power supply rejection ratio)
PSRR measures how well a circuit ignores noise and ripple on its power supply, usually expressed in decibels. A high PSRR means disturbances on the supply rail barely affect the circuit's output. It is a key specification for voltage references, regulators, and amplifiers, and one of the metrics checked during automated verification.
Temperature coefficient
The temperature coefficient, or tempco, describes how much a circuit parameter — such as a reference voltage — drifts as temperature changes. It is often quoted in parts per million per degree Celsius (ppm/°C). A low tempco is a defining requirement for precision analog circuits, which must perform identically in a freezer and on a hot circuit board.
LDO regulator
A low-dropout (LDO) regulator is a linear voltage regulator that can hold its output steady even when the input voltage is only slightly above the output. LDOs are valued for low noise, fast response, and simplicity, and they appear in almost every power management system — often several per chip, each supplying a different block.
DC-DC converter
A DC-DC converter changes one DC voltage into another, usually by switching energy through inductors or capacitors at high frequency. Switching converters are far more efficient than linear regulators when the voltage difference is large, at the cost of switching noise and greater design complexity. They are a staple of power management IC design.
ADC (analog-to-digital converter)
An ADC translates continuous analog signals into digital numbers that a processor can work with. Its front-end circuitry — amplifiers, sample-and-hold stages, and references — is classic analog design territory, where precision and noise determine the quality of every measurement downstream. Sensing and ADC front-ends are among the circuit types Samurai supports.
LNA (low-noise amplifier)
An LNA is the first amplifier in a radio receiver chain, designed to boost very weak antenna signals while adding as little noise of its own as possible. Because it sits first in the chain, its noise performance largely sets the sensitivity of the entire receiver. LNAs are a fundamental RF building block.
VCO (voltage-controlled oscillator)
A VCO generates a periodic signal whose frequency is set by an input control voltage. VCOs are core building blocks of phase-locked loops, frequency synthesizers, and radio transceivers, where their phase noise and tuning range shape overall system performance.
Process corners
Process corners are the extreme variations of a manufacturing process — for example, transistors that come out faster or slower than the typical device. Robust analog designs are simulated at every corner, combined with temperature and supply-voltage extremes, to guarantee that every manufactured part will meet its specification, not just the average one.
Monte Carlo analysis
Monte Carlo analysis simulates a circuit hundreds or thousands of times with random device-to-device variations drawn from the foundry's statistical models. It predicts the yield and the spread of performance across real manufactured chips. This matters especially for analog circuits that depend on well-matched devices, such as references and data converters.
DRC / LVS
DRC (design rule check) verifies that a chip layout obeys the foundry's geometric manufacturing rules, such as minimum widths and spacings. LVS (layout versus schematic) verifies that the drawn layout electrically matches the intended schematic. Both are mandatory sign-off checks that every design must pass before tapeout.
Biasing network
A biasing network sets the DC operating currents and voltages that keep every transistor in a circuit working in its intended region. Getting the biasing right is foundational to analog design — a mis-biased amplifier simply does not amplify. Samurai generates bias networks automatically as part of circuit synthesis, then confirms operating points in simulation.
EDA (electronic design automation)
EDA is the category of software used to design chips: schematic editors, simulators, layout tools, and verification suites. Digital design has been heavily automated by EDA for decades, while analog design has remained largely manual. Samurai is an AI-native addition to the category — instead of giving an expert a canvas, it generates and verifies analog designs directly from plain-English specifications.