参数资料
型号: ZL10038LDG
厂商: Zarlink Semiconductor Inc.
英文描述: MULTIMETER, DIGITAL; Accuracy, AC voltage range:+/-1.5% rdg + 3 digits; Accuracy, DC current range:+/-2.5% rdg + 3 digits; Accuracy, DC voltage range:+/-1.2% rdg + 3 digits; Accuracy, resistance range:+/-1.5%rdg + 3 digits; Current RoHS Compliant: NA
中文描述: 数字卫星调谐器射频旁路
文件页数: 12/38页
文件大小: 939K
代理商: ZL10038LDG
ZL10036
Data Sheet
12
Zarlink Semiconductor Inc.
2.0 Functional Description
Figure 3 - Functional Block Diagram
2.1 Quadrature Down-Converter
In normal applications the tuner RF input frequency of 950 - 2150 MHz is fed directly to the ZL10036 RF input
preamplifier stage, through an appropriate impedance match. The input preamplifier is optimized for NF, S11 and
signal handling.
The signal handling of the front end is designed such that no tracking filter is required to offer immunity to input
composite overload.
2.2 AGC Functions
The ZL10036 contains an analogue RF AGC combined with digitally controlled gain for RF, baseband pre-filter and
post-filter, as described in Figure 4. The baseband AGC is controlled by the I2C bus and is divided into pre- and
post-baseband filter stages, each of which have 12.6 dB of gain adjust in 4.2 dB steps.
The RF AGC is provided as the dynamic system gain adjust under control of the baseband analogue AGC output
function whereas the digitally controlled gains are provided to maximize performance under different signal
conditions. The total AGC gain range will guarantee an operating dynamic range of -92 to -10 dBm.
The digitally controlled RF gain adjust and the baseband pre-filter stage can be adjusted in sympathy to maintain a
fixed overall conversion gain. The lower RF gain setting would be used in situations where for example there is a
high degree of cable tilt or high desired to undesired ratio, whereas the higher RF gain setting would be used in
situations where for example it is desirable to minimize NF.
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