Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Wireless receiver of non-crystal oscillator

A crystal-free oscillator and wireless receiver technology, applied in electrical components, transmission systems, etc., can solve problems such as the inability to meet the frequency error requirements of wireless communication systems

Inactive Publication Date: 2014-07-09
深圳市锐迪芯电子有限公司
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a frequency error range is only suitable for some related applications that do not have strict frequency requirements, and is far from meeting the frequency error requirements of wireless communication systems.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wireless receiver of non-crystal oscillator
  • Wireless receiver of non-crystal oscillator
  • Wireless receiver of non-crystal oscillator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] like image 3 Shown, the present invention is by front-end filter 301, low noise amplifier 302 and 303, mixer 304,305, intermediate frequency filter 306,307, 90 ° phase-shifting network 308, frequency discriminator 309, charge pump 310, filter capacitance 311, composed of a voltage controlled oscillator 312, a signal demodulation circuit 313 and a lock detection circuit 314. In the initial state, the input voltage Vcp of the voltage-controlled oscillator 312 is set to an initial value Vref, and the output signal frequency is Fvco. The output frequency of the VCO 312 is proportional to the input voltage Vcp. After the radio signal is received by the external antenna, it is filtered by the front-end high-frequency filter 301 and amplified by the low-noise amplifiers 302 and 303 to generate a reference signal that can be processed by the back-end circuit, assuming that the frequency of the reference signal is Fref. The output signal Fvco of the voltage-controlled oscilla...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A wireless receiver of a non-crystal oscillator comprises a front end filter, low noise amplifiers, mixers, intermediate frequency filters, a 90 degrees phase shift network, a frequency discriminator, a charge pump, a filter capacitor, a voltage-controlled oscillator, a signal demodulation circuit and a locking detecting circuit. A feedback circuit which is composed of a frequency subtracter, the voltage-controlled oscillator and a frequency-voltage converting circuit is adopted in the internal integration to replace an external crystal oscillator, and the output frequency of the voltage-controlled oscillator can better follow the input reference frequency, so that a high precise local oscillating frequency is provided.

Description

technical field [0001] The invention relates to a wireless receiver, in particular to a wireless receiver which integrates internal reference clock and clock automatic calibration and does not need an external crystal oscillator. Background technique [0002] Existing wireless communication systems require an independent crystal oscillator to provide a precise reference frequency for frequency and clock synchronization for the transmitter and receiver. However, the application of the crystal oscillator has disadvantages such as large occupied area and high cost. like figure 1 , the wireless communication system is composed of a wireless transmitter 102 and a wireless receiver 103. The wireless transmitter 102 and the wireless receiver 103 need to work at exactly the same reference clock frequency to ensure the correct sending and receiving of data. The reference clock frequency of the system The influence by factors such as external manufacturing process, operating voltage...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04B1/22H04B1/40H04B1/16
Inventor 孙茂友李富民
Owner 深圳市锐迪芯电子有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com