The patented performance of the new generation silicon tuner Si2155 exceeds

Currently, there are two main types of products in the digital tuner market, namely traditional CAN tuners and emerging silicon tuners . The former has mature technology, low power consumption and great cost-effectiveness. The latter uses advanced silicon process technology to integrate the entire signal tuning part on a single chip. Compared with traditional CAN tuners, silicon tuners have the advantage of smaller size. With the continuous advancement of silicon tuner technology in recent years, power consumption and cost are gradually decreasing, and performance is continuously optimized and improved. The new generation of high-performance Si2155 silicon tuners has reduced costs by 40% compared to traditional CAN tuners and 15% compared to the previous generation of silicon tuner products. At present, power consumption and price are almost the same as CAN tuners.

Si2155 patented architecture

Si2155 is the first silicon TV tuner IC launched by Silicon Labs that exceeds the performance of traditional MOPLL (CAN tuner), and is also the first silicon TV tuner solution widely accepted by the TV industry. Si2155 is a high-performance, low-cost TV tuner IC based on Silicon Labs' patented architecture, and is a product optimized for mainstream flat-panel TVs in China. The two most important features of Si2155 are industry-leading high sensitivity and highly selective and anti-blocking RF front-end, making it easier to receive the weakest signals and the most TV channels.

In the Si2155 architecture, Silicon Labs integrates the tracking filter at the front end of the architecture, and also installs a high-performance DSP in the blank area of ​​the architecture, which can perform real-time dynamic calibration. Therefore, the high-performance DSP can also maximize the performance of the tracking filter, which is also a very important part of the architecture. "

Other features of the TV tuner architecture of the Si2155 patented technology include the integration of complete signal processing from RF input to IF output, including an on-chip tracking filter with integrated inductor. In the design, the Si2155 reduces more than 100 peripheral discrete components, including low noise amplifiers (LNA), inductors and SAW filters, greatly simplifying the design of TV tuners. The frequency range of the Si2155 is 42MHz~870MHz, suitable for various broadcasting standards, and low phase noise can achieve the best DVB-T2/C2 system performance. Silicon Labs also designs "board-level" for ultra-thin flat-panel TVs. Since the Si2155 reduces more than 100 discrete components, the high integration of the Si2155 significantly reduces the thickness and cost of the module, and the ultra-thin reference design has the simplest and lowest BOM cost. Using a 2-layer PCB, all components are placed on the top layer, and a common, low-cost shielding cover makes the total network interface module 2.5mm thick with a compact small 5mm × 5mm QFN package. The traditional CAN tuner solution is about 10mm thick. Si2155 also has two working modes: analog TV, digital TV and cable TV, and is compatible with global broadcast standards, as well as software and APIs compatible with the entire product line. Alan Hansford said: "Our silicon TV tuner products have been widely adopted by five of the world's top seven TV brands. This is because we are very familiar with the specific needs of these top brands in the market, and our rich practical experience makes our products suitable for the needs of many countries and manufacturers."

High sensitivity and high selectivity performance

Usually, high sensitivity and high selectivity are contradictory. How to optimize and improve these two technical indicators at the same time? Alan Hansford introduced, "When we started designing this product, we had already thought about how to develop both high sensitivity and high selectivity, so we adopted several advanced technical means. First, we use a high-linear front-end design, which greatly expands the range of our entire front-end receiving frequency, so that the sensitivity can be well reflected and the selectivity range is also larger; second, we use a lot of digital designs, including AGC calibration, etc. These digital designs also make the selectivity more reflected."

In Si2155, the sensitivity is excellent, making it easy to receive the weakest TV signals and more channels. At 30dB VSNR, the sensitivity is:

-67dBm. The sensitivity of Si2155 exceeds that of MOPLL tuner by 1dB, and the noise figure is 4dB for enhanced VSNR protection. At the same time, Si2155 also has excellent selectivity and anti-blocking, showing good reception in dense spectrum areas (analog and digital), with VSNR being +10dB better than other solutions under adjacent channel blocking, and up to +15dB better than other solutions under distant channel blocking. The improvement of these two technical indicators means that in analog TV, there can be a more stable picture and stronger anti-interference ability. For digital TV, channel selection is faster and more optimized.