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Amplitude shift keying demodulator and demodulation method of amplitude shift keying signals

An amplitude shift keying and demodulator technology, which is applied in the demodulation, demodulation, and amplitude modulation carrier system of amplitude modulation oscillation, can solve the problems of small demodulation gain of source follower, incompatibility of CMOS integrated circuits, etc. Effects of low power consumption, improved reliability, and simplified circuit structure

Active Publication Date: 2013-07-17
BEKEN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SBD and CMOS integrated circuits are not compatible, and the gain of source follower demodulation is small

Method used

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  • Amplitude shift keying demodulator and demodulation method of amplitude shift keying signals
  • Amplitude shift keying demodulator and demodulation method of amplitude shift keying signals
  • Amplitude shift keying demodulator and demodulation method of amplitude shift keying signals

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Embodiment Construction

[0033] Such as figure 1 Shown is a block diagram of a circuit structure of a device including an amplitude shift keying demodulator according to an embodiment of the present invention. The device 100 receives the ASK signal ASK signal through the amplitude shift keying demodulator 200 of the embodiment of the present invention, and the amplitude shift keying demodulator 200 demodulates the ASK signal ASK signal to generate a demodulated signal Demodulated signal and The demodulated signal Demodulated signal is provided to the downstream circuit 120 . In different embodiments of the present invention, the device 100 can be any device that receives an ASK signal, such as an on board unit (OBU) in an ETC system. In the ETC system, the ASK signal ASK signal is generated by the RSU, and is formed by modulating a wake-up signal onto a radio frequency carrier. In the embodiment of the present invention, the frequency of the wake-up signal can be 14KHz, and the frequency of the radio...

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Abstract

The invention discloses an amplitude shift keying demodulator which comprises a rectifying circuit, an active load circuit and a comparator. The rectifying circuit is used for receiving amplitude shift keying signals and rectifying the amplitude shift keying signals; the active load circuit is used for receiving rectifying current and providing impedance; the impedance is inversely proportional to at least a part of the rectifying circuit when a frequency of a baseband signal satisfies a preset condition; and the comparator is used for comparing reference voltage and generation voltage and outputting a decoding signal. The invention also discloses a demodulation method of amplitude shift keying. The amplitude shift keying demodulator and the demodulation method of the amplitude shift keying signals have the advantages of being low in power consumption, compatible with a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) integrated circuit, capable of improving reliability of decoding and capable of enabling gain to perform dynamic regulation to expand a power range of amplitude shift keying signals can be received.

Description

technical field [0001] The invention relates to an amplitude shift keying (Amplitude Shift Keying, ASK) demodulator; the invention also relates to a demodulation method of an amplitude shift keying signal. Background technique [0002] ASK demodulators are commonly used in communication systems. For example, in an electronic toll collection system (Electronic Toll Collection, ETC), it is typical that a wake-up signal broadcast by a roadside read-write unit (Road Side Unit, RSU) is modulated into an ASK signal. [0003] In order to save energy, in the prior art, Schottky diodes (Schottky Barrier Diodes, SBD) or source followers (Source Followers, SF) are generally used to demodulate the ASK signal. However, SBD and CMOS integrated circuits are not compatible, and the gain of source follower demodulation is small. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide an amplitude shift keying demodulator, which has ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/06
CPCH04L27/06H03D1/2272
Inventor 不公告发明人
Owner BEKEN CORP
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