A Novel Transmitter Applied to LTE MTC Power Internet of Things

A power Internet of Things and transmitter technology, which is applied to the modulation transformation of semiconductor devices with at least two electrodes, electrical components, transmission systems, etc., can solve the problems of low efficiency of power amplifiers, large dynamic range, and high power consumption. Achieve low power consumption and improve energy efficiency

CN108923797BInactive Publication Date: 2019-10-15SOUTHEAST UNIV +4
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-10-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a novel transmitter applied to an LTE MTC electric power Internet of Things. The novel transmitter comprises: a DSM modulator used for respectively sampling and modulating twopaths of I and Q orthogonal digital baseband signals outputted by a baseband portion to obtain two paths of digital electric signals; a local oscillator variable gain attenuator used for attenuating local oscillator signal power and outputting multiple paths of orthogonal differential signals; an upper mixer used for converting the two paths of digital electric signals and using the same as control signals of a transistor switch in the upper mixer so as to control the transistor switch to select a certain path of the orthogonal differential signals output by the local oscillator variable gainattenuator to obtain and output a radio frequency signal; a variable gain radio frequency amplifier used for amplifying the radio frequency signal at a desired gain; a radio frequency power amplifierused for amplifying the power of the radio frequency signal; and a radio frequency SAW filter used for filtering the out-of-band noise from the radio frequency signal with amplified power. The noveltransmitter disclosed by the invention has low power consumption, can adopt a radio frequency power amplifier with high nonlinearity, and improves the energy efficiency of the transmitter.
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Description

technical field

[0001] The invention relates to a novel transmitter applied to the LTE MTC power Internet of Things, and belongs to the technical field of radio frequency communication circuits. Background technique

[0002] MTC has the characteristics of large coverage, large connection, and high real-time performance. It is a communication technology in the field of Internet of Things. MTC signals are compatible with LTE signals. In theory, LTE transmitters can be used in MTC systems. However, the communication field of the Internet of Things has extremely strong requirements for transceivers with low power consumption. Therefore, the institute needs to develop RF transceiver chips specially for MTC systems.

[0003] Legacy transmitters use a baseband DAC and legacy RF transmitter architecture. LTE and MTC systems adopt multi-carrier-based technology, which makes the dynamic range of the transmitter baseband signal larger, so the bit width of the baseband DAC reaches more...

Examples

Embodiment Construction

[0026] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the present invention has designed a kind of novel transmitter that is applied to LTE MTC power internet of things, and described transmitter mainly comprises the DSM modulator of two Delta-Sigmas, up-mixer, local oscillator variable gain attenuator, Variable gain RF amplifiers, RF power amplifiers and RF SAW filters.

[0028] Wherein, the two DSM modulators are used to sample and modulate the I and Q two-way orthogonal digital baseband signals output by the baseband part respectively to obtain two-way digital level signals; the local oscillator variable gain attenuator uses It is used to attenuate the power of the local oscillator signal and output four quadrature differential signals; the up-mixer is used to transform the two digital level signals as the control signal of the internal transistor switch to control the transist...