140dB Range (1nA to 10mA)
SGM834A
Logarithmic Current-to-Voltage Converter
CHARACTERIZATION TEST SETUP (continued)
HP 3577A
Network
Analyzer
OUTPUT INPUT INPUTA INPUTB
Power
Splitter
SGM834A
1
2
3
4
5
6
7
14
13
12
11
10
9
GND
AGND
BFNG
VPS
+IN
PWDN
VSUM
INPT
B
A
+VS
AD8318
Evaluation
Board
R1
0.1μF
VOUT
VPS
VSUM
VPDB
VREF
750Ω
470pF
BFIN
VLOG
8
Figure 5. Converter Small Signal Bandwidth Measurement Setup
HP 89410A
SOURCE
1
TRIGGER
CHANNEL 1
CHANNEL 2
SGM834A
14
13
12
11
10
9
GND
AGND
BFNG
VPS
2
3
4
5
6
7
PWDN
VSUM
INPT
R1
VOUT
VPS
Alkaline
D Cell
VSUM
VPDB
VREF
750Ω
470pF
BFIN
VLOG
Alkaline
D Cell
8
Figure 6. Noise Spectrum Measurement Setup
SG Micro Corp
www.sg-micro.com
FEBRUARY 2022
12
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
