Circuit Design Services

Analog, digital, and mixed-signal circuit design — Precision analog front-ends, high-speed digital, isolated interfaces, and power electronics. Simulation-driven, field-validated.

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Circuit Design Expertise

Analog Circuit Design Methodology

Analog circuit design is where engineering meets art — and where simulation meets reality. Unlike digital circuits where “1” and “0” provide generous noise margins, analog signals live in a continuous domain where every microvolt of noise, every degree of temperature drift, and every picofarad of parasitic capacitance matters. At InnovChip, our analog design methodology is anchored in simulation-first validation using LTspice (for discrete circuits) and TINA-TI (for TI-specific designs). Before any PCB is laid out, we simulate the complete signal chain — sensor, amplifier, filter, ADC driver — across worst-case temperature, component tolerance (Monte Carlo), and power supply variation. This catches issues like insufficient phase margin in op-amp feedback loops, clipping due to output swing limitations, and noise exceeding the ADC’s effective resolution.

For precision measurement circuits (strain gauge bridges, thermocouple cold-junction compensation, pH probe interfaces, current shunt monitors), we design with chopper-stabilized or auto-zero amplifiers (e.g., AD8628, OPA333, MAX44246) to achieve sub-1 μV input offset drift over temperature. PCB layout for these circuits follows strict rules: Kelvin connections for sense resistors, guard traces driven to the common-mode voltage around high-impedance nodes, no switching signals routed near the analog section, and star grounding so that digital return currents cannot modulate the analog ground reference. We also implement software-based calibration routines — multi-point linearization, temperature compensation via lookup tables or polynomial correction, and offset/gain calibration stored in MCU EEPROM.

Digital Circuit and Interface Design

On the digital side, our expertise covers the full spectrum from simple logic-level interfaces to high-speed memory and serial buses. For memory interfaces, we design with DDR3 (up to 1066 MT/s) and DDR4 (up to 2400 MT/s) on i.MX 8M and similar application processors, using fly-by topology for address/command lines, matched-length data byte lanes, and on-die termination (ODT) values calculated from IBIS simulations. For serial high-speed links (USB 3.1 Gen1 at 5 Gbps, PCIe Gen3 at 8 GT/s), we perform S-parameter extraction of the PCB transmission lines, eye diagram simulation with transmitter/receiver IBIS-AMI models, and compliance with the respective eye mask specifications before releasing the design.

Power Integrity and Decoupling Strategy

A circuit is only as good as its power supply. We treat power integrity as a first-class design constraint, not an afterthought. For every digital IC, we calculate its transient current demand (di/dt) and the resulting voltage droop (ΔV = L × di/dt + ESR × I) based on the PDN impedance. We then design the decoupling network: bulk capacitors (10-100 μF electrolytic or tantalum) for low-frequency energy storage, mid-frequency ceramic capacitors (1-10 μF X7R/X5R) placed near the IC, and high-frequency capacitors (0.1 μF, 0.01 μF in 0402 or 0201 packages) placed as close as physically possible to each power pin pair — with minimal via inductance by using via-in-pad or multiple parallel vias. For sensitive analog supplies (PLL, ADC reference, low-noise amplifiers), we add ferrite bead + capacitor Pi-filters or dedicated ultra-low-noise LDOs to isolate them from the main digital supply rail.

Technologies We Master

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