Industry development of baby monitor
In the history of the baby monitor industry, 2.4G digital baby monitors and 40/49M baby monitors occupy the main part. Since the 1980s, the 40/49MHz baby monitor production industry has basically adopted a dozen MHz crystal oscillation and then tripled the frequency to obtain the operating frequency. The advantage of this solution is that the technology is simple and the cost is low, but the triple frequency leads to the circuit There are a lot of unnecessary harmonics and fundamental waves in it. In order to filter out the unwanted frequencies, the desired frequency is usually selected by means of mid-cycle tuning. Therefore, the production and debugging are complicated, and the defective rate is high, and one working frequency needs one crystal. For monitors with multi-channel selection, multiple crystals are needed, which increases the production cost and the complexity of mid-week tuning. With the rapid economic development, the rapid upgrading of electronic products, and fierce competition among industry enterprises, product cost control has become an important threshold for consumer electronics. At present, the foreign baby monitor industry is relatively mature and widely used, with well-known brands such as Angelcare.
Compared with 2.4G digital baby monitors, 40/49M baby monitors have a huge cost advantage, which makes them always occupy a large proportion of the baby monitor market, but because most chip design companies’ products are aimed at the RF market Therefore, the products that can be used in 40-49MHz baby monitors are rare, the MCD2006S chip, which is similar to the situation not only in China but also abroad. The current domestic better solution is to use phase-locked loop chip technology, well-known brands such as Maxic. The result of using this technology is to simplify the production and debugging of the baby monitor, improve the production yield, and solidify the ROM and RF power amplifier functions of the commonly used frequency of the 40/49MHz baby monitor.