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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)： | 27/76頁 |
| 文件大?。?/td> | 890K |
| 代理商： | UAA1570HL |
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1999 May 10
27
Philips Semiconductors
Product specification
Global Positioning System (GPS) front-end
receiver circuit
UAA1570HL
The limitation imposed by image noise is illustrated in
Fig.18 where the ideal calculated filter response is
compared against the measured noise density at the
output of the first IF filter. The single sided FET probe
measured result was corrected by +6 dB to account for
10 log----------------
balanced processing and
or
11.2 dB to accommodate power conversion losses.
The IF noise density selectivity is seen to be limited by the
available RF gain and noise figure of the first mixer. At the
image frequency, 34.86 MHz, the measured noise floor is
approximately 13 dB below the desired IF level at
41.82 MHz. This will result in an image contribution to the
noise figure of the system of approximately 0.2 dB.
663
The in-band noise density can be estimated based on the
single-ended voltage gain to the output of the IF filter. With
the antenna thermal input level at approximately
174 dBm/Hz, noise figure of approximately 4 dB and
voltage gain from the antenna to the IF filter output of
approximately 47 dBV (at 5 V supply voltage), we can
expect the differential noise power density to be
approximately
174 dBm + 4 dB + 47 dBV + 6 dB
10 log----------------
(conversion to balanced)
or
129 dBm/Hz. The final term converts the measured
power using a high impedance FET probe, calibrated to a
50
environment, to the actual 663
differential filter
output environment.
50
Fig.18 First IF filter output noise power density (application board).
(1) Ideal calculated filter response.
(2) Measured filter noise density.
handbook, halfpage
Nd
(dBm/Hz)
30
140
130
150
160
34
50
MHB281
38
42
46
f (MHz)
(2)
(1)
34.86
×
10
6
/sec
41.82
×
10
6
/sec
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