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Multimode Multifrequency RF Transmitter

A radio frequency transmitter, multi-mode and multi-frequency technology, applied in electrical components, transmission systems, etc., can solve the problems of large chip footprint, large multi-channel high-frequency parasitics, and high price, improve performance indicators, and reduce chip area. , reduce the effect of the signal channel

Active Publication Date: 2017-07-21
LEADCORE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the frequency coverage of this scheme is limited
Moreover, due to the use of separate matching schemes, there are disadvantages such as large chip footprint, high price, large multi-channel high-frequency parasitic, and poor performance indicators.

Method used

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  • Multimode Multifrequency RF Transmitter
  • Multimode Multifrequency RF Transmitter
  • Multimode Multifrequency RF Transmitter

Examples

Experimental program
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Embodiment Construction

[0024] The embodiment of the present invention proposes a multi-mode multi-frequency radio frequency transmitter to realize ultra-wideband impedance matching so that signals can be normally transmitted with high power. A feature of the present invention is that a BALUN (balun, balanced-unbalanced converter) matching circuit is used to realize differential to single-ended output, and an equivalent inductance and capacitor array is used to realize broadband matching. Therefore, multiple frequency bands with a large frequency span will be matched in a single channel instead of being matched separately in multiple channels. The advantage of this design is that the transmitter can cover more communication modes and their frequency bands. Embodiments of the present invention will be described below by taking a five-mode transmitter as an example.

[0025] figure 1 A circuit diagram of a multi-mode multi-frequency radio frequency transmitter according to an embodiment of the presen...

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Abstract

The invention relates to a multi-mode multi-frequency radio frequency transmitter, comprising a first baseband adjustable gain amplifier, a second baseband adjustable gain amplifier, a first quadrature mixer, a second quadrature mixer, a first high-power a driver, a second high-power driver, a first frequency selection network, and a second frequency selection network, the first quadrature mixer is connected to the first baseband adjustable gain amplifier and the second adjustable baseband gain amplifier, so The second quadrature mixer is connected to the first baseband adjustable gain amplifier and the second adjustable baseband gain amplifier, the first frequency selection network is configured to match the first frequency band composed of a plurality of communication frequency bands, so The second frequency selection network is configured to match a second frequency band consisting of a plurality of communication frequency bands, wherein at least one of the first frequency selection network and the second frequency selection network includes a balun matching circuit and is connected to the balun. A capacitor array with variable capacitance in a Lun matching circuit.

Description

technical field [0001] The invention relates to a mobile communication terminal, in particular to a multi-mode and multi-frequency radio frequency transmitter of a multi-mode mobile communication terminal. Background technique [0002] The rapid development of mobile communications and fierce competition in standards have resulted in the coexistence of multiple communication systems of different generations and competition. The current mainstream mobile communication modes include GSM / GPRS / EDGE (combined as GGE), IS-95 (CDMA ), CDMA2000, TD-SCDMA, WCDMA, LTE TDD and LTE FDD, etc. In this case, the demand for a terminal supporting multiple networks, that is, a multi-mode terminal also increases. [0003] At present, mobile communication terminal products mainly use dual-mode multi-frequency, that is, support multiple communication frequency bands, but only support two communication modes. Although there is always a demand for mobile terminals supporting more modes, the tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04
Inventor 李海松崔福良
Owner LEADCORE TECH