Frequency modulation transmitter

A transmitter and mixer technology, applied in the field of FM transmitter chip design, can solve the problems of increased chip area, inability to integrate chips, and complex design of voltage-controlled oscillator synthesizer phase-locked loops, and achieves anti-interference and sound quality. The effect of improving and simplifying design requirements

Active Publication Date: 2008-02-27
豪威国际控股有限公司
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Problems solved by technology

[0002] The frequency modulation of the traditional FM transmitter adopts the technical scheme of directly modulating the high frequency, which makes the design of its voltage-controlled oscillator (VCO) and synthesizer phase-locked loop (PLL) very complicated, and cannot be integrated into the chip, which makes the chip The area increases, which is not in line with the current technology development direction of miniaturization of chip design

Method used

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Embodiment Construction

[0039] The FM transmitter 100 provided in this embodiment is a new type of integrated circuit chip, which integrates analog-to-digital conversion, digital signal processing, and an in-phase quadrature (IQ) transmitter. The analog-to-digital conversion is responsible for accepting the input audio analog signal and converting it into a digital signal, then performing signal encoding and frequency modulation in digital signal processing, and then using the transmitter to up-convert the modulated signal to the 100MHz radio band and transmit it. It can use a fully on-chip frequency synthesizer to generate a carrier signal of about 100MHz. The present invention is not limited to this embodiment, for example, the input audio signal may be stereo, mono, multi-channel and other signals.

[0040] Specifically as shown in Figure 1:

[0041] An FM transmitter 100 includes an audio signal input terminal (left channel 10 , right channel 20 ) and a radio frequency signal output terminal 50 ...

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Abstract

This invention provides a FM emitter including an audio signal input end and a RF signal input end, a signal input processor, a digital signal process unit used in carrying out audio code and frequency modulation to signals output by the signal input processor, a signal output processor used in carrying out filter and D / A conversion to signals output by the digital signal process unit, a FM signal process part used in carrying out up frequency conversion and D / A conversion and emitting them to signals output by the unit and a frequency integrating module providing stable carrier signals, which not only simplifies design requirement to VCO and PLL of synthesizers, but also can integrate it in a chip by putting the frequency modulation part on a digital baseband.

Description

technical field [0001] The invention relates to the technical field of frequency modulation transmitter chip design in digital communication. Background technique [0002] The frequency modulation of the traditional FM transmitter adopts the technical scheme of directly modulating the high frequency, which makes the design of its voltage-controlled oscillator (VCO) and synthesizer phase-locked loop (PLL) very complicated, and cannot be integrated into the chip, which makes the chip The increase in area does not conform to the current technological development direction of miniaturization of chip design. Contents of the invention [0003] The purpose of the present invention is to propose an FM transmitter, which puts the frequency modulation part on the digital baseband, so as to simplify the design of the voltage-controlled oscillator (VCO) and the phase-locked loop (PLL) of the synthesizer. [0004] An FM transmitter, comprising an audio signal input terminal and a radi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/12H04B1/04
Inventor 黄保黔徐卫军
Owner 豪威国际控股有限公司
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