uaa1570hl NXP Semiconductors, uaa1570hl Datasheet - Page 32

• Manufacturer Part Number: uaa1570hl
• Description: Global Positioning System Gps Front-end Receiver Circuit
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The true power of a product at the output of the second
IF filter in a 1 k environment should be no more than
a 50
1999 May 10
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. The equivalent single-sided measurement with
105 dBm/Hz + 63 dB
Global Positioning System (GPS) front-end
receiver circuit
(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.
calibrated probe would be
Fig.22 Second IF filter output noise density frequency response on the application board.
13 dB or approximately
handbook, halfpage
(dBm/Hz)
–
N d
55 dBm
110
130
150
90
0
3.48 x 10
+
10 log
6
/sec
4
548
--------- -
4.86 x 10
50
(4)
32
6
/sec
8
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.
(3)
(2)
(1)
12
f (MHz)
MHB285
16
UAA1570HL
Product specification