Low-Noise Signal Conditioning
Implementation of precision instrumentation amplifiers, active filtering, and impedance matching for microvolt-level signals.
HARDWARE DEVELOPMENTAnalog & Mixed-Signal
Analog & Mixed-Signal
Design Services.
Precision Engineering for Complex Signal Chains
In an increasingly digital world, the interface between the physical and digital domains remains the most critical bottleneck in high-performance electronics. Qmax Systems provides comprehensive analog and mixed-signal development services, specializing in high-fidelity signal acquisition, precision conditioning, and ultra-low-noise environments.
From femto-farad capacitance sensing to giga-sample data converters, our engineering team addresses the fundamental challenges of electromagnetic interference, signal integrity, and thermal stability to ensure laboratory-grade accuracy in field-deployed hardware.
Our Analog & Mixed-Signal Expertise
Bridging the gap between raw physical phenomena and actionable digital data requires a deep understanding of physics and electronic theory. Our expertise spans the entire signal chain:
High-Speed Data Acquisition (DAQ)
Design of multi-channel systems featuring simultaneous sampling and synchronized clock distribution.
Power Integrity for Analog
LDO-based precision regulation, split-rail generation, and decoupling strategies to minimize PSRR-related noise.
Advanced PCB Topology
Specialized layout techniques for isolation, guard rings, and star-grounding to eliminate ground loops and crosstalk.
Core Service Offerings
1. Precision Analog Front-End (AFE) Design
We develop custom AFEs tailored for specific sensor modalities, including capacitive, inductive, resistive, and piezoelectric transducers. Our designs focus on maximizing Signal-to-Noise Ratio (SNR) and Spurious-Free Dynamic Range (SFDR).
2. Mixed-Signal System-on-Module Integration
Integration of high-resolution ADCs (up to 24-bit) and high-speed DACs (up to 4 Gbps) with FPGAs and SoCs. We manage the critical timing requirements of JESD204B/C interfaces and LVDS signaling.
3. RF and High-Speed Signal Interconnects
Design and simulation of transmission lines, controlled impedance routing, and return path optimization for multi-gigahertz signals used in Software Defined Radio (SDR) and telecommunications.
4. Low-Power Wearable Electronics
Optimization of analog circuits for battery-operated medical and consumer devices, focusing on nano-ampere quiescent currents without compromising signal fidelity.
Proven Project Experience
- Aerospace Structural Health Monitoring: Developed ruggedized sensing nodes for commercial aircraft, capable of high-precision strain and vibration analysis in high-EMI environments.
- 32-Channel High-Speed DAQ: Engineering a simultaneous sampling system for industrial physics applications, utilizing FPGA-based real-time data capture.
- Medical Acoustic Sensing: Designed a wearable lung sound recorder featuring a low-noise analog front-end for clinical-grade diagnostic audio.
- Femto-Farad Capacitance Measurement: Implementation of ultra-high sensitivity measurement systems for specialized industrial proximity and material analysis.
- Aerospace Cable Tension Meters: High-reliability force measurement systems with calibrated analog outputs for flight-critical applications.
- Ultra-Low-Cost Hearing Aid: Engineering a low-power, high-gain analog signal path optimized for mass-market accessibility and long battery life.
Case Studies
More case studies after NDA
Technical Differentiators
Noise Reduction and Isolation
We employ rigorous physical isolation techniques, including Moat-and-Bridge PCB structures and Faraday shielding, to protect sensitive analog nodes from digital switching noise.
Return Path Optimization
Our engineers perform detailed analysis of current return paths to prevent common-mode noise injection and ensure electromagnetic compatibility (EMC).
Real-Time FPGA Signal Processing
By pairing analog hardware with FPGA-based DSP (Digital Signal Processing), we enable real-time filtering, FFTs, and decimation at the edge, reducing the load on downstream processors.
End-to-End Development Process
- Architecture & Specification: Definition of dynamic range, bandwidth, and accuracy requirements.
- Simulation & Modeling: SPICE modeling and signal integrity simulations to validate circuit behavior.
- Schematic Capture: Component selection based on TCR (Temperature Coefficient of Resistance), voltage coefficient, and long-term stability.
- Specialized Layout: Critical placement of analog and digital planes, differential pair routing, and thermal management.
- Prototyping & Characterization: Validation using high-bandwidth oscilloscopes, spectrum analyzers, and precision source-measure units (SMUs).
- Certification Support: Pre-compliance testing for EMI/EMC standards (FCC, CE, MIL-STD).
Compliance & Standards
We adhere to stringent global standards to ensure reliability in regulated industries:
- Medical: ISO 13485, IEC 60601-1 (Signal isolation and patient safety).
- Aerospace: MIL-STD-461 (EMI) and DO-160.
- Industrial: IPC-2221/2222 for PCB design and IEC 61000 for immunity.
Why Choose Qmax Systems
Qmax Systems combines theoretical depth with manufacturing reality. Unlike pure-play design firms, we understand how parasitic elements in physical PCBs affect theoretical models. Our "First Time Right" philosophy is backed by a track record of solving the most difficult noise and interference challenges in the industry.
Complimentary Consultation Section
Discuss Your Signal Integrity Challenges
Our senior engineering team is available to review your analog signal chain requirements, from sensor selection to high-speed digitization.
Request Technical ConsultationFrequently asked questions.
1. How do you manage ground loops in multi-channel DAQ systems?
We utilize star-grounding configurations, galvanic isolation (opto/digital isolators), and differential signaling to ensure that potential differences between nodes do not introduce noise or errors.
2. What is your experience with high-speed ADC interfaces?
We have extensive experience with LVDS and JESD204B/C protocols, managing clock distribution and multi-device synchronization for rates up to 4 Gbps.
3. Can you design for sub-microvolt signal levels?
Yes. This involves selecting ultra-low-offset op-amps, implementing multi-stage filtering, and using specialized PCB materials to minimize leakage currents.
4. How do you optimize analog circuits for battery-powered devices?
We employ power-cycling techniques, select high-efficiency LDOs with low quiescent current, and use low-voltage analog components to extend operational life.
5. What PCB materials do you recommend for high-frequency mixed-signal designs?
Depending on the frequency, we utilize high-speed laminates like Rogers, Megtron 6, or high-Tg FR4 with controlled dielectric constants to minimize signal loss.
6. Do you provide FPGA firmware for data acquisition?
Yes, we provide custom RTL (Verilog/VHDL) for high-speed data capture, FIFO buffering, and initial DSP filtering.
7. How do you handle EMI/EMC compliance in analog designs?
Through early-stage simulation, proper decoupling, multi-layer shielding, and rigorous return path management.
8. Can you assist with sensor selection?
We evaluate sensors based on sensitivity, linearity, thermal drift, and output impedance to ensure they match the AFE requirements.
9. What is your approach to thermal stability in precision circuits?
We use components with low Temperature Coefficients and implement thermal relief or heat sinking to maintain a constant operating temperature for sensitive references.
10. How do you achieve high SNR in medical wearables?
By using high-order active filters to reject 50/60Hz power line noise and implementing robust shielding against RFI from wireless modules (BT/Wi-Fi).
11. What bit-depths do you typically work with?
We design systems ranging from high-speed 8-bit flash converters to high-precision 24-bit Delta-Sigma ADCs.
12. Do you support simultaneous sampling across multiple channels?
Yes, we design hardware with synchronized trigger and clock lines to ensure zero-phase skew between channels.
13. Can you miniaturize existing bulky analog designs?
We specialize in transitioning through-hole designs to high-density SMT/BGA layouts, often integrating discrete logic into small-footprint FPGAs.
14. What tools do you use for simulation?
We utilize industry-standard tools including LTSpice, PSpice, and specialized SI/PI simulation software for high-speed analysis.
15. How do you validate the performance of a completed design?
We perform rigorous characterization using precision signal generators, spectrum analyzers, and automated test fixtures to verify ENOB, SNR, and THD.
Hardware Programs
