introduction
More and more applications occupy the 30MHz to 300MHz very high frequency (VHF) band. Television and radio, navigation control and amateur radio are just a few examples. New RF component development is targeted at much higher frequency bands used in voice and data communication systems. In order to meet the stringent performance requirements of next-generation radios, significant advances in circuit technology and manufacturing processes are needed. Applying these techniques to lower frequency designs can significantly improve performance.
The LTC®5567 is a wideband mixer designed and optimized for high performance in the 300MHz to 4GHz band. To create a very compact circuit implementation, the LTC5567 has built-in integrated RF and LO transformers. In its specified frequency range, the LTC5567's input IP3 linear performance is excellent, reaching 30dBm. Down to a lower frequency requires a built-in transformer to maintain this linearity and conversion gain. Since the starting point level of linearity is so high, it is worthwhile to change the mixer circuit design and characterize the performance at lower VHF frequencies. The proof of performance is in the test.
Impedance matching design
Figure 1 shows an impedance matching design using the LTC5567. Table 1 lists the design values ​​that still achieve excellent performance with input port matching extended below 300MHz (down to 150MHz). In addition, test results are also provided.
Figure 1: VHF mixer design
Table 1: VHF impedance matching design values 
Figure 2 shows the LTC5567 mixer gain and input IP3 versus input frequency. The mixer's linear performance is improved when the input frequency is close to 150MHz. The input, LO, and output port return loss measurements are shown in Figure 3, Figure 4, and Figure 5, respectively. Overall performance is maintained over the VHF range compared to higher input frequencies. Therefore, when used in a radio design, its high IP3 and conversion gain produce the largest dynamic range. The higher dynamic range minimizes adjacent channel interference and improves selectivity. Although the LTC5567 can operate at input frequencies below 150MHz (when the conversion gain is reduced), this is not recommended as the internal transformer is damaged.
Figure 2: Mixer IIP3 and gain performance measurements 
Figure 3: RF input return loss 
Figure 4: LO Input Return Loss
in conclusion
The LTC5567 provides very high linearity performance at VHF and UHF input frequencies. The high IP3 value and P1dB (Table 2) make this device ideal for high performance radio designs over a wide frequency range.
Figure 5: IF Output Return Loss
Table 2: P1dB compression point and LO leakage versus input frequency. Output frequency = 50MHz, HSLO
Led Panel Light is a high-end interior lighting, the outer frame made of aluminum alloy by anodic oxidation, the light source is LED, lighting design simple and beautiful, luxurious atmosphere, both good lighting effects, but also brings beautiful feeling. Unique design LED panel 18w light, the light guide plate after a high light transmittance to form a homogeneous plane glow effect, illuminance uniformity is good, light, soft, comfortable yet bright, can relieve eye fatigue. LED indoor panel lights can also radiation, will not stimulate the pregnant women, the elderly, children's skin.
LED Panel light Installation form:
1, can be mounted on the ceiling, walls and installation of surface;
2, LED Panel light may be suspended under the ceiling or mounting body. When mounted on a white ceiling, the entire ceiling was the same color, very beautiful, clean and coordinated;
3, LED panel light using broadband voltage design (AC85-240V / 50-60Hz), can be used in all countries of the world; high-power LED with isolated power, constant current or constant voltage drive, high power efficiency, power clean, stable performance ,Safe and reliable;
4, LED panel light are similar LCD TV backlight technology, a new type of surface light source, light and soft, beautiful appearance, has been widely favored by European and American businessmen, a large number of foreign investors are Buying good quality, good service, good price led Panel Light and suppliers;
Application:
Packing with paper boxes:
Mingxue Optoelectronics Co.,Ltd. has apply the I S O 9 0 0 1: 2 0 0 8 international quality management system certificate, for led panel light we apply the CE, RoHS and SAA certificate for our led lighting product.
Led Panel Light
Led Panel Light,Led Ceiling Panel Light,Square Led Panel Light,Outdoor Led Panel Light
Shenzhen Mingxue Optoelectronics CO.,Ltd , https://www.led-lamp-china.com