Today's automotive infotainment system fully embodies innovative and excellent automotive engineering technology. The system has evolved from the original car radio into a comprehensive multimedia in-vehicle electronics that integrates audio-visual entertainment, in-vehicle communication, navigation, network control and other functions. system. The tuner and audio digital signal processor (DSP) have played an important role in this evolution. In addition to providing a variety of power solutions for automotive infotainment system applications, ON Semiconductor also develops and provides advanced tuner and audio DSP solutions by integrating its expertise in automotive systems, multimedia and communication fields and rich intellectual property modules. Support all the current and future comprehensive functions that help to improve the driving experience.
Tuner classification and ON Semiconductor tuner solutions
Car tuners are vehicle-mounted devices used to receive FM / AM broadcasts, and are divided into analog tuners, digital tuners, and data tuners. Analog tuner is a traditional system onboard tuner for basic models; digital tuner is for mid-to-high-end models, suitable for digital radios, with higher signal reception quality and easier to use, becoming the current trend; data tuner can receive Traffic information, wireless data broadcasting system (RDS) / China real-time traffic information (RTIC), suitable for all models.
In actual use, if the same FM broadcast signal arrives at the receiving terminal at different times, multi-channel distortion noise will be generated. ON Semiconductor's DSP tuner uses the unique intellectual property of the continuous modulus algorithm (ConTInues Modulus Algorithm, referred to as CMA) technology, which can greatly reduce multi-channel noise. ON Semiconductor also has another intellectual property right for multi-channel noise-the mature dual-tuner adaptive array antenna (adapTIve-array-antenna, AAA) technology, and plans to launch subsequent products.
Specifically, CMA is a multi-channel noise suppression technology for a single tuner. Compared with the traditional technology, the additional feedback type can avoid the occurrence of false ghosts, and greatly improve the multi-channel noise receiving speed under various conditions; the change of the evaluation function / coefficient update formula greatly improves the receiving speed, effectively preventing FB Side divergence. The actual test confirmed the effect of improving the anti-noise performance.
Figure 1: CMA improves noise immunity
Figure 2 compares the multi-channel noise cancellation performance of CMA and AAA technologies with the traditional single-tuner technology. The vertical axis on the left is the number of pulse noises per minute, and the vertical axis on the right is the noise intensity. Obviously, ON Semiconductor ’s single tuner technology can greatly reduce multi-channel noise, and the dual-tuner AAA technology can almost completely eliminate multi-channel noise .
Figure 2: Comparison of CMA and AAA technologies with traditional technologies
In addition, due to the use of low-IF technology, compared with the traditional tuner circuit (Figure 3), ON Semiconductor's DSP tuner circuit significantly reduces peripheral circuits. Compared with the traditional analog tuner, 52 peripheral components are greatly reduced, including VCO coil, varactor diode, FM adjustment coil, ceramic filter, IF adjustment transformer, PIN diode, FM MOSFET, AM j-FET.
Figure 3: DSP tuner circuit is significantly reduced compared to traditional tuners
Figure 4 is a block diagram of ON Semiconductor's DSP tuner. It can be seen from the figure that the analog front end is a newly designed LNA and MIX, which can be operated at low voltage and only requires 5 V power supply; the digital back end can support the broadcast interface. DSP uses CMA algorithm, with HD mixing function.
Figure 4: Block diagram of ON Semiconductor DSP tuner
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