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SRF-2016Z 参数 Datasheet PDF下载

SRF-2016Z图片预览
型号: SRF-2016Z
PDF下载: 下载PDF文件 查看货源
内容描述: 200 - 600 MHz的硅锗中频接收机 [200 - 600 MHz Silicon Germanium IF Receiver]
分类和应用: 接收机
文件页数/大小: 7 页 / 122 K
品牌: SIRENZA [ SIRENZA MICRODEVICES ]
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SRF-2016 SiGe IF Receiver  
The Sirenza SRF-2016 is a variable gain I-Q demodulator  
designed for use in receiver IF sections, as shown in the  
figure below. It consists of five subcircuits: two cascaded  
switched gain stages, a matched pair of mixers, and a LO  
quadrature generator. This part is also available in a lower  
frequency version, the SRF-1016.  
The SRF-2016 has high gain at UHF frequencies, so insta-  
bility can result if there is poor power supply decoupling or  
undesired coupling from the input to the output. The follow-  
ing considerations should be observed when laying out a  
PC board:  
• Follow the general layout of the evaluation board, keep-  
ing the power supply decoupling capacitors as close to  
the package as possible.  
• The back of the package, the two ground pins and the  
decoupling capacitors should connect directly to ground,  
preferably to a large dedicated ground plane.  
• Use the parallel L-R circuits on the input pins.  
• Ensure that the input signal tracks are routed far from  
the output tracks.  
The gain stages are broadband differential amplifiers each  
with a digital control pin to set the gain. The gain control  
pins act independently of each other. Since the amplifiers  
have approximately the same gain, setting GC1 high and  
GC2 low results in approximately the same gain as setting  
GC1 low and GC2 high. The former setting is preferred  
because it offers better noise figure. The IF input is differ-  
ential with internal bias circuitry to set the common mode  
voltage. The use of blocking capacitors to facilitate AC  
coupling is highly recommended to avoid changing the  
common mode voltage. Either input may be driven single-  
ended if the other input is connected to ground through an  
AC short such as a 1000 pF capacitor. This typically  
results in slightly lower input P1dB.  
• The Vcc pins are not internally connected, so all must be  
connected together externally with the specified decou-  
pling capacitors.  
The figures on page 5 illustrate a typical SRF-2016’s per-  
formance with respect to temperature. Note that these  
numbers include the effect of the R-L network in the IF  
port.  
The two matched mixers are configured with the quadra-  
ture LO generator to provide in-phase and quadrature  
baseband outputs. These can be fed through ADCs to a  
DSP engine, or can be fed into a low frequency 90 degree  
hybrid for image rejection. Alternatively, the IF signal can  
be extracted from the BBI port by injecting DC into the LO  
port.  
The frequency response of the IF and LO ports is domi-  
nated by the L-R network on the input. When de-embed-  
ded, the gain and P1dB response is within 0.5 dB from  
200 MHz to 600 MHz.  
The SRF-2016 features immunity from changes in LO  
power. The gain typically changes by less than 0.6 dB over  
a 6dB range of LO power. Also note the excellent I/Q bal-  
ance, which typically falls within a 0.15 dB and 1.5 degree  
window from 200 MHz to 600 MHz, and varies less than  
0.05 dB and 0.5 degree over temperature (-40 to +85C).  
The LO and IF ports offer a differential 50 ohm impedance.  
The package (and in the case of the input port, the parallel  
L-R network) adds inductance that tends to degrade return  
loss. This can easily be matched out with a series capaci-  
tor. The 8.2 pF capacitor on the evaluation board is appro-  
priate for 400 MHz operation; larger capacitors should be  
used for lower frequencies.  
The package dimensions are shown on page 3. Note that  
heat is removed from the part via the back side heat slug,  
so this slug must be properly soldered to a copper plane  
under the part.  
Evaluation boards are available for this device, and a  
description of the board is shown on page 6. Note that the  
evaluation board uses baluns on the I/Q outputs, and  
these baluns limit the low frequency response of the  
device. For true baseband operation, the baluns should be  
removed, and the differential signals used directly.  
BB  
I
Filter  
ADC  
SRF  
2016  
RF  
Filter  
IF  
Filter  
LNA  
BB  
Q
Filter  
ADC  
Typical use for the SRF-2016 in a receiver  
employing digital I/Q demodulation.  
303 South Technology Court  
Broomfield, CO 80021  
Phone: (800) SMI-MMIC  
4
http://www.sirenza.com  
EDS 102137 Rev C