Wireless

When companies need the most reliable in RF design, they turn to AVID.

AVID’s RF expertise is among the best in the industry. Whether designing for harsh, EMI noisy environments or low power / long range applications, AVIDs custom RF solutions ensure your data gets through in any set of conditions. Our Engineers are experts in:

Wireless Networking


  • Point to point and multi-node networking
  • Distributed sensor networks
  • Interference detection and aversion
  • WiFi, PAN, Bluetooth, 802.15.4, GSM/GPRS, IoT, ISM & proprietary

RFID


  • AVID’s engineering team has a proven history of developing a wide variety of RFID products including standard and custom passive and active systems operating from 50 kHz to 2.4 GHz
  • LF and HF standard and custom reader designs
  • HF custom ISO and NFC protocol solutions
  • Broad array of solutions in production including passive keyless entry, inventory and asset tracking as well as ID and security

Position and Proximity Sensing


  • LF omni-directional range detection
  • UHF multi-device TDMA custom protocol
  • Low frequency triangulation position sensing
  • Proximity detection incorporating near/ far distance detection and data acquisition – AVID patented

Antenna Design and Tuning


  • PCB trace and off-the shelf antenna designs
  • Matching and tuning networks

Design Verification, Certification & Testing


  • On-site RF Screen Room and RF test equipment for development and verification
  • Certified Lab testing for US and international agency compliance support
  • RF test procedures and test fixture development and support

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Case Studies


Passive Keyless Entry System


Passive Keyless Entry SystemProject:

Passive Keyless Entry System

Application
Vehicle Electronics

Customer Need
A Tier1 automotive company desired a fully functional, production-ready design of a passive keyless entry and ignition system to offer to major automotive OEMs. The system uses low frequency immobilizer technology leveraging RFID techniques. System components include base station, key fob, and highly directional antennas. A system prototype integrated into an actual vehicle for presentation purposes is included in the development program.

AVID’s Solution
Using technology and components which are targeted for RKE and RFID, AVID designed the base station and key fob boards. HF was used for traditional push button operation, whereas LF was used to achieve the passive hands-free mode. Multiple antennas are required to accurately detect the position of the fob; inside or outside the vehicle. This allows starting when inside the passenger compartment, but inhibited when outside. Additionally, a locked door will remain locked when the fob is inside, but unlocks when in close proximity outside. Custom omni-directional antennas to facilitate LF and HF wavelengths were designed to fit in side view mirrors, door handles, and in the passenger compartment. A custom electro-mechanical latch was designed to address combo electro-mechanical and straight mechanical opening and locking. Rolling code algorithms were implemented for security. The fob required special attention to power management to achieve long battery life. Critical factors considered for the design include automotive environmental and EMC requirements, cost, reliability, safety, and adaptability to different vehicles.

Value Added or Technologies Applied

  • Product Specification
  • System Architecture and Design (Hardware, Firmware, Mechanical, RF)
  • Prototype and Validation
  • Multiple Demonstration System Integrations (Vehicle Cut-Away, Full Vehicle, Motorcycle, Bench Top Demo System)
  • Project Management of Several Third Party Contributors of System Components
  • Manufacturing Engineering Support, Production Test Procedure
  • Customer Support for OEM Presentations and SAE Show Support for Demo Platforms and Booth Duty
Keyless Ignition Electronics

Vehicle Key FobProject:
Keyless Ignition Electronics

Application
Vehicle Key Fob

Customer Need
A mechanically-oriented customer needs electronic design assistance for a keyless fob ignition system. The system incorporates off-the-shelf immobilizer technology but requires electronics for position detection of the fob for the different states of ignition power normally addressed by a key switch. In this case the fob is inserted into a movable trolley to achieve the equivalent of accessory, on, start, and off. A push to start feature is required along with dimmable panel lighting, and interface to other vehicle electronics. Compliance with the automotive MISRA documentation standard was required.

AVID’s Solution
A low cost microcontroller was implemented to perform sensing of limit switches which were triggered by the trolley position. Dedicated outputs were controlled based on a closely controlled state machine based on normal operation requirements but constrained by safety and fail safe considerations. PWM was used for backlight dimming of the panel lighting provided by LEDs. Multiple LEDs and light pipes were used for a consistent brightness. All software documentation was created to comply with the MISRA spec. Special care was paid to the board design to meet stringent automotive requirements for power and EMC.

Value Added or Technologies Applied

  • Hardware and Firmware Architecture
  • Hardware and Firmware Design and Documentation Compliant with Automotive Standard
  • Prototype and Validation
  • Engineering Build for Customer Testing and Field Tests
  • Qualification Test Support
  • Manufacturing Support
Wireless Sensor Acquisition System


Wireless Sensor Acquisition SystemProject

Wireless Sensor Acquisition System

Application
Engine Monitoring

Customer Need
Our customer received a government contract to develop a wireless sensor system to be used to monitor and record various engine parameters such as battery voltage, engine oil level and viscosity, antifreeze temperature, vibration monitoring, and so on. To eliminate wiring, the sensors were to be battery powered and include a low cost wireless interface. The base station is powered from the vehicle battery and includes sufficient storage of sensor data history, its own I/O, and a Bluetooth interface which provides for downloading vehicle data wirelessly at the maintenance facility.

AVID’s Solution
AVID was asked to design a prototype model of the system first. Once proven and approved by the government, a Phase 2 would follow for actual packaging of the sensors. The system was designed around a custom 915MHz RF link. Each sensor was addressable and reported data when requested by the base. The sensor design included analog inputs capable of voltage or current inputs, software programmable gain stage, and 12 bit A/D. A factory calibration process allowed the use of embedded reference and other non-precision components. The base station included similar inputs as well as the memory for data storage. An off-the-shelf Bluetooth module was selected for the model to shorten development time and cost. Several boards were made which were actually put into vehicle to complete the proof of concept.

Value Added or Technologies Applied

  • System Architecture, Sensor Electronics and Base Station Hardware and Firmware Architecture
  • Hardware Design of the Base Station and Sensor Board
  • Firmware Design of the Sensor Board, Firmware Driver Design and Test Code for the Base Station
  • PCB Layout of Both Boards
  • Prototype and Validation
  • Engineering Builds for Proof of Concept Systems
  • EMC Test Support
Patient Monitoring


In-Home Patient MonitorProject

Patient Monitoring

Application
In-Home Patient Monitor

Customer Need
More people are addressing health care at home. However, these same people are not trained care givers and require automated monitoring, reminders for medications and other tasks, and alert systems to notify for assistance. Collected data can be downloaded to doctors for analysis, adjustments to medication and other diagnosis. Some monitoring equipment is worn by the patient with wireless reporting ability. The use of a set top box allows on TV screen instructions, and interfaces via broadband modem and the Internet to the professional care giver.

AVID’s Solution
A high end Power PC-based design was implemented, capable of running a high level Linux operation system. This allowed the use of library functions for communication, encryption, graphics, sound, and others. ISM-band RF interfaces were designed to collect data from remote, patient-worn monitor devices and panic keypad remotes. Ethernet was included as the link to the remote care giver locations; as well an option was included to add CDMA. Audio alarms alerted the patient if action was required. A modulation circuit allowed for custom screens to be displayed on specific TV channels. Multiple DSPs were implemented off a PCI bus from the PPC to allow for real time video processing.

Value Added or Technologies Applied

  • Hardware Architecture
  • Hardware Design and Advanced PCB Layout; PPC High-Speed DRAM, Daisy-Chained DSP Array, External Interfaces (RF and Ethernet), NTSB Video and Audio, USB 2.0
  • Prototype and Validation
  • Software Integration Support

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