AD8348_15 Datasheet, PDF (16/28 Pages) Analog Devices – 50 MHz to 1000 MHz Quadrature Demodulator

AD8348
VGA/DEMODULATOR AND BASEBAND AMPLIFIER
2.0
1.5
1.0
2.7V, 0.2V, –40°C
0.5
5V, 0.2V, +85°C
0
5V, 0.2V, –40°C
–0.5
2.7V, 0.2V, +85°C
5V, 0.2V, +25°C
2.7V, 0.2V, +25°C
–1.0
–1.5
–2.0
100 200 300 400 500 600 700 800 900 1000
IF FREQUENCY (MHz)
Figure 37. Quadrature Phase Error vs. FIF, VGIN = 0.7 V, VPOS = 2.7 V, 5 V,
Temperature = −40°C, +25°C, +85°C
2.0
1.5
2.7V, 0.7V, +25°C
1.0
2.7V, 0.7V, –40°C
5V, 0.7V, –40°C
0.5
0
–0.5
5V, 0.7V, +25°C
–1.0 2.7V, 0.7V, +85°C
5V, 0.7V, +85°C
–1.5
–2.0
0
5
10
15
20
25
30
35
40
BASEBAND FREQUENCY (MHz)
Figure 38. Quadrature Phase Error vs. FBB, VGIN = 0.7 V, VPOS = 2.7 V, 5 V,
Temperature = −40°C, +25°C, +85°C, FIF = 380 MHz
0.4
0.2
5V, 0.7V, 25°C
0
–0.2
–0.4
0
5
10
15
20
25
30
35
40
BASEBAND FREQUENCY (MHz)
Figure 39. I/Q Amplitude Imbalance vs. FBB, Temperature = 25°C, VPOS = 5 V
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
100 200 300 400 500 600 700 800 900 1000
IF FREQUENCY (MHz)
Figure 40. I/Q Amplitude Imbalance vs. FIF, Temperature = 25°C, VPOS = 5 V
300
2.2
280
2.0
260
1.8
240
1.6
220
1.4
SHUNT CAPACITANCE
200
1.2
180
1.0
SHUNT RESISTANCE
160
0.8
140
0.6
120
0.4
100
50
0.2
150 250 350 450 550 650 750 850 950
IF FREQUENCY (MHz)
Figure 41. Input Impedance of IF Input vs. FIF, VGIN = 0.7 V, VPOS = 5 V
90
120
60
150
30
180
0
IFIP WITH L PAD
210
IFIP WITHOUT L PAD
330
IMPEDANCE CIRCLE
240
300
270
Figure 42. S11 of IF Input vs. FIF, FIF = 50 MHz to 1 GHz, VGIN = 0.7 V,
VPOS = 5 V (with L Pad, with No Pad, Normalized to 50 Ω)
Rev. A | Page 16 of 28