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參數(shù)資料
| 型號： | UAA1570HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Global Positioning System (GPS)baseband processor(通用定位系統(tǒng)基帶處理器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, SOT-313, LQFP-48 |
| 文件頁數(shù)： | 32/76頁 |
| 文件大?。?/td> | 890K |
| 代理商： | UAA1570HL |
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1999 May 10
32
Philips Semiconductors
Product specification
Global Positioning System (GPS) front-end
receiver circuit
UAA1570HL
The true power of a product at the output of the second
IF filter in a 1 k
environment should be no more than
105 dBm/Hz + 63 dB
13 dB or approximately
55 dBm. The equivalent single-sided measurement with
a 50
calibrated probe would be
or
44.6 dBm. Figure 22 illustrates the true noise power
density as measured points for this lower gain case.
The filter response of the first IF filter is translated to the
second IF and superimposed at the second IF to show that
the 3rd harmonic reference spur at 43.2 MHz, is not filtered
by this response.
55 dBm
–
10 log548
--50
+
Also shown is the second IF filter response and the
combined first and second IF filter selectivities, which
account for total observed selectivity noise response.
For difficult applications which require higher losses in the
IF filters, self jamming can be minimized by choosing a
reference and frequency plan which places the harmonics
of the reference exactly at the second LO frequency,
where they are benign.
Fig.22 Second IF filter output noise density frequency response on the application board.
(1) IF1 filter response superimposed on IF2 filter response.
(2) IF2 filter response (calculated).
(3) IF2 filter noise density (measured).
(4) IF1 filter response translated to IF2 frequency.
handbook, halfpage
0
4
8
16
Nd
(dBm/Hz)
f (MHz)
130
150
110
MHB285
12
(2)
(3)
(4)
(1)
6
/sec
4.86 x 10
6
/sec
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