1
dc1774acf
DEMO MANUAL DC1774A-C
DESCRIPTION
LTC6431-15
50
Ω
Gain Block IF Amplifier
Demonstration circuit 1774A-C features the LTC
®
6431-15
gain block amplifier. The LTC6431-15 has a power gain of
15.5dB and it is part of the LTC643X-YY amplifier series.
DC1774A-C is part of the DC1774A demo boards fam-
ily supporting the LTC643X-YY family. The demo board
DC1774A-C is optimized for a frequency range from
100MHz to 1200MHz. It incorporates a minimum of
passive support components to configure the amplifier
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
for various applications. The LTC6431-15 provides 50Ω
single-ended input and output impedance so that it can
be easily evaluated with most RF test equipment.
Design files for this circuit board are available at
http://www.linear.com/demo
Specifications are at T
A
= 25°C, V
CC
= 5V
SYMBOL
PARAMETER
CONDITIONS VALUE/UNIT
Power Supply
V
CC
Operating Supply Range
All V
CC
Pins Plus +OUT
4.75V to 5.25V
I
CC
Current Consumption
Total Current
90mA
FREQUENCY
(MHz)
POWER GAIN
S21
(dB)
OUTPUT
THIRD-ORDER
INTERCEPT POINT
1
OIP3
(dBm)
OUTPUT
THIRD-ORDER
INTERMODULATION
1
OIM3
(dBc)
SECOND
HARMONIC
DISTORTION
2
HD2
(dBc)
THIRD
HARMONIC
DISTORTION
2
HD3
(dBc)
OUTPUT 1dB
COMPRESSION
POINT
P1dB
(dBm)
NOISE FIGURE
3
NF
(dB)
100
15.1
46.6
–89.2
–58.0
–88.0
20.0
3.8
200
15.4
46.7
–89.5
–58.0
–88.0
20.0
3.5
240
15.6
46.7
–89.3
–59.0
–88.0
20.3
3.4
300
15.5
46.6
–89.3
–60.0
–86.0
20.1
3.5
400
15.5
46.1
–88.3
–57.0
–87.0
20.3
3.5
500
15.4
45.3
–86.6
–55.6
–77.0
20.3
3.6
600
15.3
43.5
–83.1
–53.6
–69.0
20.4
3.7
700
15.2
42.2
–80.4
–51.9
–69.0
20.2
3.8
800
15.0
41.1
–78.1
–49.2
–65.0
20.1
4.0
900
14.8
39.5
–74.9
–46.7
–63.0
19.7
4.2
1000
14.7
38.7
–73.3
–45.0
–59
19.3
4.2
1100
14.5
38.0
–71.9
–40.8
–56.8
18.8
4.4
1200
14.3
38.0
–71.9
–38.4
–54.2
18.6
4.6
Notes: All figures are referenced to J7 (Input Port) and J10 (Output Port).
1. Two-tone test condition: Output power level = +2dBm/tone; Tone spacing = 1MHz.
2. Single-tone test condition: Output power level = +6dBm.
3. Small signal noise figure.
