THS4505 Datasheet, PDF (15/38 Pages) Texas Instruments – WIDEBAND, LOW-DISTORTION, FULLY DIFFERENTIAL AMPLIFIERS

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THS4504
THS4505
SLOS363C – AUGUST 2002 – REVISED MARCH 2004
TYPICAL CHARACTERISTICS (5 V GRAPHS)
SMALL SIGNAL UNITY GAIN
FREQUENCY RESPONSE
1
0
−1
−2
Gain = 1
R_L = 800 Ω
−3 Rf = 499 Ω
P_IN = −20 dBm
V_S = 5 V
−4
0.1
1
10
100
f − Frequency − MHz
Figure 38.
1000
LARGE SIGNAL FREQUENCY
RESPONSE
25
Gain = 10, R_f = 1.8 kΩ
20
R_L = 800 Ω
V_O = 2 V_PP
V_S = 5 V
15 ^{Gain = 5, Rf = 1.8 kΩ}
10
Gain = 2, R_f = 1.8 kΩ
5
Gain = 1, R_f = 1.8 kΩ
0
−5
0.1
1
10
100
f − Frequency − MHz
Figure 41.
1000
HARMONIC DISTORTION
vs
OUTPUT VOLTAGE SWING
0
−10 ^{Single-Ended Input to}
Differential Output
−20 Gain = 1
−30
R_L = 800 Ω
R_f = 499 Ω
−40 f= 30 MHz
−50 ^{VS = 5 V}
−60
HD2
−70
−80
HD3
−90
−100
0
0.5 1 1.5 2 2.5 3 3.5 4
V_O − Output Voltage Swing − V
Figure 44.
SMALL SIGNAL FREQUENCY
RESPONSE
22
Gain = 10
20
18
16
Gain = 5
14
12
10
8 _{Gain = 2}
6
4 ^RL ^{= 800 Ω}
2
R_f = 499 Ω
P_IN = −20 dBm
0
V_S = 5 V
−2
0.1
1
10
100
1000
f − Frequency − MHz
Figure 39.
HARMONIC DISTORTION
vs
OUTPUT VOLTAGE SWING
0
−10 ^{Single-Ended Input to}
Differential Output
−20 Gain = 1
−30
R_L = 800 Ω
R_f = 499 Ω
−40 f= 8 MHz
−50 ^{VS = 5 V}
−60
HD3
−70
−80
HD2
−90
−100
0
0.5 1 1.5 2 2.5 3 3.5 4
V_O − Output Voltage Swing − V
Figure 42.
HARMONIC DISTORTION
vs
LOAD RESISTANCE
0
Single-Ended Input to
−10
Differential Output
Gain = 1
−20
V_O = 2 V_PP
R_f = 499 Ω
−30
V_S = ±5 V
−40
HD3, 30 MHz
HD2, 30 MHz
−50
−60
−70
−80
−90 HD3, 8 MHz
HD2, 8 MHz
−100
0
400
800
1200
R_L − Load Resistance − Ω
1600
Figure 45.
0.1 dB GAIN FLATNESS
FREQUENCY RESPONSE
0.05
0
−0.05
R_f = 499 Ω
−0.1
−0.15
−0.2
−0.25
−0.3
1
Gain = 1
R_L = 800 Ω
P_IN = −20 dBm
V_S = 5 V
10
100
f − Frequency − MHz
Figure 40.
1000
HARMONIC DISTORTION
vs
FREQUENCY
0
−10 ^{Single-Ended Input to}
Differential Output
−20 Gain = 1
−30
R_L = 800 Ω
R_f = 499 Ω
−40 VO = 2 VPP
V_S = 5 V
−50
−60
HD3
−70
−80
−90
−100
0.1
HD2
1
10
100
f − Frequency − MHz
Figure 43.
THIRD-ORDER INTERMODULATION
DISTORTION
vs
FREQUENCY
−30
Single-Ended Input to
Differential Output
−40
Gain = 1
−50 ^{RL = 800 Ω}
R_f = 499 Ω
V_O = 2 V_PP
−60 ^{VS = 5 V}
−70
V_O = 1 V_PP
−80
−90
−100
10
200 kHz Tone Spacing
100
f − Frequency − MHz
Figure 46.
15