Lead Analog & Mixed-Signal (AMS) Designer

Qailash Labs; Vijayawada; Hybrid; INR 4,500,000 - 7,000,000; Full time

Benefits offered by this job

ESOP grant

Job summary

Qailash Labs in Vijayawada (AP) is seeking a Senior AMS Circuit Designer / Analog Lead with 5+ years of transistor-level experience to own mixed-signal blocks from schematic sizing to post-layout verification in a hybrid work setup.

You will collaborate with Silicon Architects and Layout Engineers on CTIA/DAC/Reference blocks, simulate with Cadence Virtuoso/Spectre, and contribute to ESOP as part of a founding team.

Qualifications

• Transistor-level schematic design, device sizing and SPICE verification for analog blocks.
• Possesses 5+ years hands-on experience with tape-out or graduating PhD/MTech in related field.
• Experience with front-end silicon converter research is a plus.
• Partner with Architects and Layout to achieve sign-off with minimal leakage and noise.
• Knowledge of PVT verification, noise modeling and mismatch mitigation.

Responsibilities

• Lead transistor-level schematic design and precision sizing of AMS blocks.
• Perform Monte Carlo verification and post-layout parasitic extraction sign-off.
• Collaborate with Silicon Architects and Custom Layout Engineers on SDL layouts.
• Develop Verilog-A / SystemVerilog-AMS models for mixed-signal co-simulation.
• Design low-noise sensor front-ends, high-resolution data converters, and power/bias circuits.

Skills

Transistor-level design

AMS circuit design

Cadence Virtuoso

SPICE simulation

Monte Carlo analysis

Analog/mixed-signal

LDO regulators

Bandgap references

Tape-out experience

Education

M.Tech or Ph.D. in Microelectronics, VLSI Design, or Electrical Engineering

Tools

Cadence Virtuoso

Spectre / Spectre-AMS

ADE-XL/Assembler

Calibre PEX

Job description

Role Level: Core Engineering (Senior AMS Circuit Designer / Analog Lead)

Location: Vijayawada (AP) / Hybrid (Flexible)

Experience: 5+ years of dedicated hands-on experience in Transistor-Level Custom AMS Circuit Design with proven tape-out closure (or graduating M.Tech/Ph.D. with relevant silicon converter/front-end research)

APPLICANT SCOPE & SCREENING NOTICE (PLEASE READ CAREFULLY):

Strictly Custom Silicon IC Design: This position requires transistor-level schematic design, device sizing, and SPICE simulation of custom analog blocks in Cadence Virtuoso / Spectre.

Non-Applicable Profiles: Candidates whose experience is limited to standard cell library characterization (.lib modeling), automated digital RTL/FPGA implementation, or board-level (PCB) circuit design or no industry experience are not suitable for this silicon IC design role.

Role Overview:

Lead custom transistor-level schematic design, precision sizing, compact SPICE model verification, and AMS simulation of low-noise sensor front-ends, high-resolution column data converters, and precision power/bias management circuits on advanced deep-submicron CMOS and SOI process nodes. Working in close collaboration with our Silicon Architects and Custom Layout Engineers, you will own critical mixed-signal blocks from architectural definition through schematic sizing, Monte Carlo verification, and post-layout parasitic extraction (PEX) sign-off.

Key Responsibilities:

Sensor Front-End Design: Architect, size, and simulate low-noise Capacitive Transimpedance Amplifiers (CTIA), Direct Injection (DI), Buffered Direct Injection (BDI), and Correlated Double Sampling (CDS) noise-filtering stages to achieve ultra-low input-referred noise and wide dynamic range.

Column-Parallel Data Converters: Design high-resolution (12-bit to 14-bit), low-power column-parallel SAR ADCs operating within tight column-pitch constraints; implement asynchronous SAR timing control logic, monotonic/split-capacitor CDAC switching topologies, and dynamic comparators with Dynamic Offset Cancellation (DOC).

Precision References & Power Management: Design curvature-compensated bandgap voltage references, low-noise bias current distribution networks, and high-PSRR on-chip Low Dropout (LDO) regulators with stable operation under wide capacitive loading.

Extreme Temperature & PVT Verification: Perform rigorous multi-corner SPICE simulations across PVT corners (SS, FF, TT) and wide operational temperature envelopes, accounting for device threshold voltage shifts, carrier mobility variations, and leakage behavior.

Statistical & Noise Modeling: Execute comprehensive Monte Carlo mismatch simulations, transient noise analyses, and Periodic Steady-State (PSS / Pnoise) regressions to ensure robust yield and offset cancellation.

Layout Collaboration & Post-Layout Sign-Off: Collaborate directly with Custom Layout Engineers on schematic-driven layout (SDL), common-centroid matching, sensitive charge node shielding, and parasitic extraction (PEX) re-simulation to ensure zero post-layout performance degradation.

Behavioral Modeling: Develop Verilog-A and SystemVerilog-AMS behavioral models for full-chip mixed-signal co-simulation and automated digital top-level verification.

Qualifications & Technical Skills:

Education: M.Tech or Ph.D. in Microelectronics, VLSI Design, or Electrical Engineering with a focus on Analog & Mixed-Signal IC design.

Experience: 6+ years of hands-on transistor-level custom analog circuit design experience with at least one successfully taped-out IC (commercial or multi-project wafer shuttle).

Core Design Expertise: Proven track record in designing at least two of the following: SAR ADCs, CTIA / low-noise charge amplifiers, high-speed dynamic comparators, bandgap references, or on-chip LDO regulators.

EDA Tools Mastery: Deep proficiency in Cadence Virtuoso Schematic Editor, Spectre / Spectre-AMS, ADE-XL/Assembler, and post-layout extraction flows (Quantus / Calibre PEX).

Physics & Modeling Insight: Solid grasp of deep-submicron device physics, compact modeling (cryogenic-grade advanced-node compact device models, PSP), noise mechanisms (1/f and thermal noise), and device mismatch mitigation.

Professional Background: Prior experience at fabless semiconductor companies, analog IDMs, or specialized custom IC design houses is preferred.

Founding Team & Equity: This is a founding-team position; selected candidate will receive a meaningful ESOP grant and be recognised as a core technical founding team member of the Qailash Labs silicon team.