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    A MULTI-BAND SUB 1-
    GHZ RF TRANSMITTER

Keyless entry systems are now standard in modern vehicles — but global deployment isn’t. Each region operates on different sub-1 GHz frequency bands, governed by distinct regulatory standards.

Leading automotive electronics brand turned to Cyient Semiconductors to develop a single RF transmitter ASIC that can operate globally, without design variants, tuning components, or manual calibration — powering keyless entry systems across the world.

At the core of connected industry

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Smart metering (gas/water/electricity)

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Smart metering (gas/water/electricity)

Secure, low-power communication for real-time utility monitoring

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Time-of-flight
for robotics

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Time-of-flight
for robotics

Precision sensing for navigation and obstacle detection in automation

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Lighting, building automation, and HVAC

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Lighting, building automation, and HVAC

Fire detection, CCTV/video surveillance cameras, intruder alarm, thermostats & controls

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NFC and RFID systems

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NFC and RFID systems

Seamless smart infrastructure integration with telecom expertise

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Encoders for robotics

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Encoders for robotics

High-precision motion control for automation and industrial robotic applications

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Test equipment

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Test equipment

Automated test equipment for semiconductors, digital multimeters, network analyzers, digital oscilloscopes

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Factory automation & control

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Factory automation & control

Flow, level, pressure, and temperature measurement

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Motor drives

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Motor drives

AC variable speed drives, DC drives, servo drives, stepper drives, soft starters/brakes

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Power & energy

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Power & energy

AC/DC supplies, converters, inverters, battery chargers, UPS, generators, and renewable energy (hydro/solar/wind)

Success in action

How we’ve helped leaders in Industry 4.0 and robotics

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LED driver array for industrial printers

Designed an advanced LED driver array using TSMC 0.18µm technology, enhancing industrial printing with precise current control and on-chip diagnostics.

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Laser distance measurement system for Industry 4.0

Developed a System-on-Chip (SoC) for laser distance measurement with precise laser driver pulse steering and a Transimpedance Amplifier (TIA) photodiode front end, achieving accurate distance measurements for automation and manufacturing.

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High precision GPS receiver

Designed a high-precision GPS receiver using TSMC 65nm technology, ensuring accurate location tracking even in challenging environments, enabling applications like surveying and asset tracking.

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Smart metering with acoustic front end

Developed an ultra-sound transceiver using TSMC 0.18µm CMOS technology for accurate flow metering and acoustic sensing, enabling precise water, heat, and electricity usage measurement in smart meters.

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High-performance EPC Gen2 RFID UHF reader

Developed a highly integrated RFID reader IC suitable for fixed and mobile applications. The complete UHF radio transceiver is integrated on-chip, including the digital modem and an ARM Cortex M0+ core. The design features a low-noise, high-linearity optimized receiver to support backscattering communication, ensuring reliable performance in diverse environments.

From design to silicon:
full-spectrum semiconductor expertise

Custom semiconductor design and turnkey ASIC solutions, built for Industry 4.0 and robotics

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The ask

To support global vehicle platforms, the application needs an RF transmitter that can:

  • Operate at 315 / 433 / 868 / 915 MHz
  • Eliminate external tuning elements and calibration steps
  • Deliver high-speed, noise-resilient performance
  • Eliminate external tuning elements and calibration steps
  • Remain compact, power-efficient, and achieve high-volume production quality constraints
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Bringing the solution to life

Cyient Semiconductors collaborated closely with the customer’s engineering team to architect a production-grade RF ASIC built for regulatory compliance, real-world noise, and product scalability.

The chip includes:
  • A fractional-N sigma-delta synthesizer for precise, programmable frequency control
  • A fully integrated VCO with custom-modeled inductors — no external passives needed
  • A calibration-free signal path designed for consistency across temperature and voltage variations
  • Compact, automotive-grade design aligned with ISO and AEC-Q100 expectations
The integration framework guided every aspect — from architecture to layout — ensuring manufacturability, testability, and long-term scalability.

Where it’s used today

The RF transmitter chip is now in volume production and integrated into the customer’s global keyless entry systems. Built on a scalable integration framework, it delivers consistent performance across diverse platforms — without the need for regional redesigns, tuning components, or manual calibration. Its adoption has streamlined the customer’s supply chain, reduced system complexity, and accelerated rollout timelines across multiple markets.

Need specialized silicon for
industrial automation? 

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