MAX2170 VHF和L波段输入端口的S11参数
max2170 vhf和l波段输入端口的s11参数
abstract: this application note shows how the max2170 triple-band (t-dmb, dab, fm) receiver's input-scattering parameter (s11) is measured for the vhf and l-band inputs.
overview the max2170 direct conversion to low-if tuner has an input scattering parameter (s11), which is measured for the vhf and l-band inputs. the calibration plane is at the pin of the ic.
the vhf input consists of a bandpass tracking filter followed by an lna. the return loss will be good for the desired channel, but will look reflective for the out-of-band channels. as a result, the s11 data will change significantly as the max2170 tunes to a new channel. to address this issue, the series 91nh inductor, which is part of the vhf tracking filter, was removed from the input for the s11 measurements (figure 1). removing this component changes the tracking filter's shape but allows s11 calibration to the pin of the ic. note, however, that the 91nh inductor is required for the tracking filter to operate properly. it must be used in the final application.
the l-band input consists of esd diodes and an lna. the input will look resistive with some shunt capacitance. the s11 data for this input will not vary when the max2170 tunes to a new channel. the l-band input can be modeled as a resistor r = 23.4ω in series with c = 4.2pf.
figure 1. schematic of the vhf and l-band inputs to the max2170. the 91nh inductor for the vhf input can be removed for calibration of s11 data.
performance summary table 1 shows s11 data (magnitude and phase) for the vhf and l-band inputs. the rf frequency is changed for each measurement.
table 1. s11 (magnitude/phase) for vhf and l-band input
band channel frequency
(mhz) pin = -50dbm
mag phase
vhf 5a 174.928 0.690 -39.2
9b 204.64 0.729 -31.6
13f 239.2 0.776 -26.1
l la 1452.96 0.503 -115.4
ll 1471.792 0.479 -116.9
lw 1490.624 0.459 -117.1
table 2 shows s11 data (real and imaginary) for the vhf and l-band inputs. the rf frequency is changed for each measurement.
table 2. s11 (real/imaginary) for vhf and l-band inputs
band channel frequency
(mhz) pin = -50dbm
real imaginary
vhf 5a 174.928 5.35e-01 -4.37e-01
9b 204.64 6.21e-01 -3.83e-01
13f 239.2 6.97e-01 -3.41e-01
l la 1452.96 -2.15e-01 -4.55e-01
ll 1471.792 -2.17e-01 -4.27e-01
lw 1490.624 -2.09e-01 -4.09e-01
test results
figure 2. the thevenin equivalent resistance and capacitance for the vhf input when the rf is tuned to 174.928mhz.
figure 3. the thevenin equivalent resistance and capacitance for the vhf input when the rf is tuned to 204.64mhz.
figure 4. the thevenin equivalent resistance and capacitance for the vhf input when the rf is tuned to 239.2mhz.
figure 5. s11 magnitude and phase for the vhf input with the max2170 tuned to 174.928mhz. note that this s-parameter data will change if the max2170's rf frequency changes.
figure 6. the thevenin equivalent resistance and capacitance for the l-band input. the thevenin equivalent circuit looks the same for rf frequencies from 1450mhz to 1500mhz. the average value is r = 23.4ω in series with c = 4.2pf.
figure 7. the thevenin model of l-band rf input in a 50ω system
figure 8. s11 magnitude and phase for the l-band input.
test files the following test files contain s11 data in citifile format for the max2170.
file description
vhf_174.928.d1 vhf input with rf tuned to 174.928mhz
vhf_204.64.d1 vhf input with rf tuned to 204.64mhz
vhf_239.2.d1 vhf input with rf tuned to 239.2mhz
l_5a.d1 l-band input with rf tuned to 1452.96mhz
l_9b.d1 l-band input with rf tuned to 1471.792mhz
l_13f.d1 l-band input with rf tuned to 1490.624mhz
电流互感器在开关电源中的应用
填补南极低层大气温度的激光雷达探测空白
探讨国内IC设计行业发展新模式
Silicon Labs优化LifeSmart云起全新推出的智能家居面板，助其轻松实现全屋控制与连接
高通与中国众多行业开展合作将助力中国5G时代早日到来
MAX2170 VHF和L波段输入端口的S11参数
通信技术智能混合助千兆家庭在2013年成为现实
如何通过ESP8266/nodemcu和Arduino IDE来获取时间
华为AI芯片强大到难以想象
高速PCB设计布线技巧
电气系统常用保护
医疗机构可以怎样使用rfid技术来完善系统
当苹果推出可折叠的 iPhone 时，iPad mini可能停售
发光二极管的正负极如何判断?
管壳式换热器中管与壳程的分析
冬季LED显示屏也“矫情”，冬季必修课，LED屏如果防静电
桃源县人机交互智能显示屏产业集群获评湖南省省级产业集群
如何布置无人值守变电站？
关于GD32创新解决方案对即时配送行业的智能化变革的影响
大众布局电动汽车 成特斯拉的竞争对手
abstract: this application note shows how the max2170 triple-band (t-dmb, dab, fm) receiver's input-scattering parameter (s11) is measured for the vhf and l-band inputs.
overview the max2170 direct conversion to low-if tuner has an input scattering parameter (s11), which is measured for the vhf and l-band inputs. the calibration plane is at the pin of the ic.
the vhf input consists of a bandpass tracking filter followed by an lna. the return loss will be good for the desired channel, but will look reflective for the out-of-band channels. as a result, the s11 data will change significantly as the max2170 tunes to a new channel. to address this issue, the series 91nh inductor, which is part of the vhf tracking filter, was removed from the input for the s11 measurements (figure 1). removing this component changes the tracking filter's shape but allows s11 calibration to the pin of the ic. note, however, that the 91nh inductor is required for the tracking filter to operate properly. it must be used in the final application.
the l-band input consists of esd diodes and an lna. the input will look resistive with some shunt capacitance. the s11 data for this input will not vary when the max2170 tunes to a new channel. the l-band input can be modeled as a resistor r = 23.4ω in series with c = 4.2pf.
figure 1. schematic of the vhf and l-band inputs to the max2170. the 91nh inductor for the vhf input can be removed for calibration of s11 data.
performance summary table 1 shows s11 data (magnitude and phase) for the vhf and l-band inputs. the rf frequency is changed for each measurement.
table 1. s11 (magnitude/phase) for vhf and l-band input
band channel frequency
(mhz) pin = -50dbm
mag phase
vhf 5a 174.928 0.690 -39.2
9b 204.64 0.729 -31.6
13f 239.2 0.776 -26.1
l la 1452.96 0.503 -115.4
ll 1471.792 0.479 -116.9
lw 1490.624 0.459 -117.1
table 2 shows s11 data (real and imaginary) for the vhf and l-band inputs. the rf frequency is changed for each measurement.
table 2. s11 (real/imaginary) for vhf and l-band inputs
band channel frequency
(mhz) pin = -50dbm
real imaginary
vhf 5a 174.928 5.35e-01 -4.37e-01
9b 204.64 6.21e-01 -3.83e-01
13f 239.2 6.97e-01 -3.41e-01
l la 1452.96 -2.15e-01 -4.55e-01
ll 1471.792 -2.17e-01 -4.27e-01
lw 1490.624 -2.09e-01 -4.09e-01
test results
figure 2. the thevenin equivalent resistance and capacitance for the vhf input when the rf is tuned to 174.928mhz.
figure 3. the thevenin equivalent resistance and capacitance for the vhf input when the rf is tuned to 204.64mhz.
figure 4. the thevenin equivalent resistance and capacitance for the vhf input when the rf is tuned to 239.2mhz.
figure 5. s11 magnitude and phase for the vhf input with the max2170 tuned to 174.928mhz. note that this s-parameter data will change if the max2170's rf frequency changes.
figure 6. the thevenin equivalent resistance and capacitance for the l-band input. the thevenin equivalent circuit looks the same for rf frequencies from 1450mhz to 1500mhz. the average value is r = 23.4ω in series with c = 4.2pf.
figure 7. the thevenin model of l-band rf input in a 50ω system
figure 8. s11 magnitude and phase for the l-band input.
test files the following test files contain s11 data in citifile format for the max2170.
file description
vhf_174.928.d1 vhf input with rf tuned to 174.928mhz
vhf_204.64.d1 vhf input with rf tuned to 204.64mhz
vhf_239.2.d1 vhf input with rf tuned to 239.2mhz
l_5a.d1 l-band input with rf tuned to 1452.96mhz
l_9b.d1 l-band input with rf tuned to 1471.792mhz
l_13f.d1 l-band input with rf tuned to 1490.624mhz
电流互感器在开关电源中的应用
填补南极低层大气温度的激光雷达探测空白
探讨国内IC设计行业发展新模式
Silicon Labs优化LifeSmart云起全新推出的智能家居面板，助其轻松实现全屋控制与连接
高通与中国众多行业开展合作将助力中国5G时代早日到来
MAX2170 VHF和L波段输入端口的S11参数
通信技术智能混合助千兆家庭在2013年成为现实
如何通过ESP8266/nodemcu和Arduino IDE来获取时间
华为AI芯片强大到难以想象
高速PCB设计布线技巧
电气系统常用保护
医疗机构可以怎样使用rfid技术来完善系统
当苹果推出可折叠的 iPhone 时，iPad mini可能停售
发光二极管的正负极如何判断?
管壳式换热器中管与壳程的分析
冬季LED显示屏也“矫情”，冬季必修课，LED屏如果防静电
桃源县人机交互智能显示屏产业集群获评湖南省省级产业集群
如何布置无人值守变电站？
关于GD32创新解决方案对即时配送行业的智能化变革的影响
大众布局电动汽车 成特斯拉的竞争对手