Wireless transmitter and wireless communication chip

Abstract

The invention discloses a wireless transmitter. The transmitter comprises a transmitting antenna, a to-be-transmitted signal input module and a cascaded primary phase-locked loop and a cascaded emitting stage phase locked loop. The input end of the primary phase-locked loop is connected to an external crystal oscillator, and the emitting stage phase-locked loop is respectively connected to the transmitting antenna and the to-be-transmitted signal input module. The invention also provides a wireless communication chip applying the above wireless transmitter. Through the cascaded primary phase-locked loop and the transmitter stage phase-locked loop, a single-point modulation mode is adopted to overcome the contradiction between communication speed, PLL bandwidth and noise suppression of a PLL-based directly modulated wireless transmitter, and effects of the noise suppression are improved while expanding phase-locked bandwidth to improve the communication speed.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a wireless transmitter and a wireless communication chip. Background technique [0002] In the field of wireless communication technology, there are mainly two schemes for the realization of direct up-conversion of wireless transmitters, one is based on IQ two-way quadrature modulation up-conversion scheme, and the other is based on PLL (phase-locked loop) direct modulation Up-conversion scheme. The PLL-based direct modulation wireless transmitter has many advantages such as relatively simple structure, low power consumption, and easy integration, which makes it more and more widely used in the field of wireless communication. However, the direct modulation wireless transmitter based on PLL has always had the contradiction between the communication rate, PLL bandwidth and noise suppression, that is, the higher the communication rate, the larger the required PLL ba...

AI Technical Summary

Problems solved by technology

[0004] Based on the above analysis, it is necessary to provide a wireless transmitter and a wireless communication chip for the problem that the traditional PLL-based direct modulation wireless transmitter cannot take into account both the speed improvement and the noise suppression ability.

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