A passive crystal oscillator-free gfsk transmitter chip

By designing a passive, crystal-free GFSK transmitter chip and employing radio frequency energy harvesting and open-loop modulation technology, the problems of high power consumption, large size, and limited battery life of traditional GFSK transmitters have been solved, achieving low-power, long-life, and high-data-rate wireless communication.

CN117526978BActive Publication Date: 2026-06-16ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2023-12-14
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing GFSK transmitters suffer from problems such as high power consumption, large size, and limited battery life in low data rate and low power consumption applications, and are particularly difficult to meet the requirements of long life and high output power in industrial monitoring systems.

⚗Method used

Design a passive crystal-free GFSK transmitter chip, employing an RF energy harvesting module, a power management module, a clock recovery module, and an open-loop modulation transmitter module. By using wireless power supply, i-type phase-locked loop, and open-loop modulation technology, the crystal oscillator and battery are eliminated, and bonded wire inductors are used to replace on-chip inductors, achieving low power consumption and small size.

🎯Benefits of technology

It achieves wireless power supply, reduces power consumption, shortens the lock-up time of the phase-locked loop, improves energy efficiency, and achieves a data rate of 2Mbps. It is suitable for scenarios with strict size requirements, reduces the hassle of battery replacement, and is compatible with transmitters of standard protocols such as Bluetooth Low Energy.

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Abstract

The application belongs to the field of integrated circuit technology design, and relates to a passive and crystal-free GFSK transmitter chip, which comprises a radio frequency energy collection module, a power management module, a clock recovery module and an open-loop modulation transmitter module, the radio frequency energy collection module is used for wireless power supply, the power management module controls a power switch of the transmitter chip according to a power supply voltage value, when the power switch is opened, the power management module supplies power to the open-loop modulation transmitter module, the clock recovery module provides a reference frequency for the open-loop modulation transmitter module, and the open-loop modulation transmitter module multiplies the reference frequency to a radio frequency frequency required for transmission and transmits a data signal. The transmitter chip has the advantages of low power consumption and small size, is suitable for wireless sensor network nodes, and has strong commercial value.
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