uaa1570hl NXP Semiconductors, uaa1570hl Datasheet - Page 49

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

Philips Semiconductors
Notes
1. The noise figure of the GPS application board is estimated from the 3 dB sensitivity testing by substitution using a
2. The sensitivity of the GPS application board is measured by recording the RF level required to observe a 3 dB drop
3. At L1 (1.57542 GHz) with a 35 dBm input with matching components tuned at 3 V at T
4. From the matched single-ended RF mixer preamplifier input to the differential IF output of MX1.
5. From the matched single-ended RF mixer preamplifier input to the differential IF output of MX1 across an equivalent
6. From the matched single-ended RF input to the differential IF output of MX1 into an equivalent 400
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
12. The peak VCO tank swing and phase noise are measured in the default application board. With high Q resonators
1999 May 10
7. From the differential transformer matched RF input to the differential IF output of MX2.
8. From the differential transformer matched RF input to the differential IF output of MX2 across an equivalent 400
9. From the differential transformer matched RF input to the differential IF output of MX2 into an equivalent 400
Global Positioning System (GPS) front-end
receiver circuit
10 dB external LNA with a noise figure of less than 2 dB.
in the sampled L1 signal, after sampling to 1.32 MHz product [3.48 MHz(IF2)
output.
400
termination).
Half of the delivered conversion gain power is delivered to an 800
transformed (z-ratio 16 : 1) down and delivered to a 50
than the power delivered to the 50
loading of an 800
differential load. Half of the delivered conversion gain power is delivered to an 800
power transformed (z-ratio 16 : 1) down and delivered to a 50
higher than the power delivered to the 50
characteristics of mini circuits RF transformer T16-6T are provided in Fig.11.
characterization using a 1 : 16
across the 800
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
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
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.
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.
loading of an 800
terminated transformer output at the limiter input. This sensitivity is not due to gain limitations, but
termination and transformer differential load (4 : 1 ratio to a 50
termination and transformer differential load (4 : 1 ratio to a 50
ratio transformer established 3 dB limiting sensitivity at 100 V (peak value)
termination.
termination. The back-to-back 50
49
termination. The available tabulated power is 3 dB higher
termination. The available tabulated power is 3 dB
termination, with the remaining power
4.8 MHz (f
: 800
operating environment defines the
termination, with the remaining
transformer termination loss.
measurement termination).
amb
: 800
sample
= 25 C.
measurement
UAA1570HL
Product specification
)] in the SIGN bit
: 50
differential load.
response