Ultrasound Variable-Gain Amplifier
Typical Operating Characteristics (continued)
(Figure 2, V CC = V REF = 4.75V to 5.25V, V GND = 0, PD = 0, VG_CLAMP_MODE = 1, f RF = 5MHz, capacitance to GND at each of the
VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R L = 1k Ω , T A = 0°C to +70°C. Typical val-
ues are at V CC = V REF = 5V, V CM = 3.0V, T A = +25°C, unless otherwise noted.)
SECOND-HARMONIC DISTORTION
vs. GAIN
THIRD-HARMONIC DISTORTION
vs. GAIN
0
-10
-20
-30
V OUT = 1V P-P DIFFERENTIAL
0
-10
-20
-30
V OUT = 1V P-P DIFFERENTIAL
-40
-50
f = 12MHz
f = 5MHz
-40
-50
f = 12MHz
f = 5MHz
-60
-70
-60
-70
-80
-90
f = 2MHz
-80
-90
f = 2MHz
-100
-15
-5
5
15
25
35
45
-100
-15
-5
5
15
25
35
45
GAIN (dB)
OVERLOAD RECOVERY TIME
MAX2035 toc06
GAIN (dB)
OVERLOAD RECOVERY TIME
MAX2035 toc07
f = 5MHz
DIFFERENTIAL
f = 5MHz DIFFERENTIAL
-60
OUTPUT OVERLOAD TO 1V P-P
CHANNEL-TO-CHANNEL CROSSTALK
vs. GAIN
INPUT
200mV/div
DIFFERENTIAL
OUTPUT
500mV/div
-30
OUTPUT OVERLOAD TO 100mV P-P
CHANNEL-TO-CHANNEL CROSSTALK
vs. FREQUENCY
INPUT
200mV/div
DIFFERENTIAL
OUTPUT
500mV/div
-65
-70
-75
-80
-85
-90
-95
-100
V OUT = 1.5V P-P DIFFERENTIAL
f = 10MHz, ADJACENT CHANNELS
-40
-50
-60
-70
-80
-90
-100
-110
V OUT = 1V P-P DIFFERENTIAL
GAIN = 20dB , ADJACENT CHANNELS
-15
-5
5
15
25
35
45
1
10
100
GAIN (dB)
FREQUENCY (MHz)
_______________________________________________________________________________________
5
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