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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)： | 49/76頁 |
| 文件大?。?/td> | 890K |
| 代理商： | UAA1570HL |
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1999 May 10
49
Philips Semiconductors
Product specification
Global Positioning System (GPS) front-end
receiver circuit
UAA1570HL
Notes
1.
The noise figure of the GPS application board is estimated from the
3 dB sensitivity testing by substitution using a
10 dB external LNA with a noise figure of less than 2 dB.
The sensitivity of the GPS application board is measured by recording the RF level required to observe a 3 dB drop
in the sampled L1 signal, after sampling to 1.32 MHz product [3.48 MHz(IF2)
4.8 MHz (f
sample
)] in the SIGN bit
output.
At L1 (1.57542 GHz) with a
35 dBm input with matching components tuned at 3 V at T
amb
= 25
°
C.
From the matched single-ended RF mixer preamplifier input to the differential IF output of MX1.
From the matched single-ended RF mixer preamplifier input to the differential IF output of MX1 across an equivalent
400
loading of an 800
termination and transformer differential load (4 : 1 ratio to a 50
measurement
termination).
From the matched single-ended RF input to the differential IF output of MX1 into an equivalent 400
differential load.
Half of the delivered conversion gain power is delivered to an 800
termination, with the remaining power
transformed (z-ratio 16 : 1) down and delivered to a 50
termination. The available tabulated power is 3 dB higher
than the power delivered to the 50
termination.
From the differential transformer matched RF input to the differential IF output of MX2.
From the differential transformer matched RF input to the differential IF output of MX2 across an equivalent 400
loading of an 800
termination and transformer differential load (4 : 1 ratio to a 50
measurement termination).
From the differential transformer matched RF input to the differential IF output of MX2 into an equivalent 400
differential load. Half of the delivered conversion gain power is delivered to an 800
termination, with the remaining
power transformed (z-ratio 16 : 1) down and delivered to a 50
termination. The available tabulated power is 3 dB
higher than the power delivered to the 50
termination. The back-to-back 50
: 800
: 800
: 50
response
characteristics of mini circuits RF transformer T16-6T are provided in Fig.11.
10. Simulated values without external pin strays.
11. Due to test time constraints the sensitivity of the limiter is measured indirectly in the current ATE test definition. Bench
characterization using a 1 : 16
ratio transformer established
3 dB limiting sensitivity at 100
μ
V (peak value)
across the 800
terminated transformer output at the limiter input. This sensitivity is not due to gain limitations, but
rather intrinsic complex broadband noise characteristics over an estimated 800 MHz equivalent sampled spectral
bandwidth. However, the measured
82 dBm sensitivity of the device in an 800
operating environment defines the
minimum level which can be detected in the sampling quantizer. The ATE test method results perform about 8.2 dBV
better than bench characterization using conventional
3 dB limiting. The specification results represent the ATE
results degraded by 8.2 dB. The limiter noise figure test is being degraded by 800
transformer termination loss.
Only a weak and remote correlation exist between highly non-linear noise figure measurements made on a time
sampled quantizer output and linear simulation results.
12. The peak VCO tank swing and phase noise are measured in the default application board. With high Q resonators
the peak voltage swing at the resonator pin should be limited to <0.8 V (peak value). A de-biasing resistor can be
added from the TANK pin to ground.
2.
3.
4.
5.
6.
7.
8.
9.
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