140dB Range (1nA to 10mA)
SGM834A
Logarithmic Current-to-Voltage Converter
CHARACTERIZATION TEST SETUP
Triax
Connector*
PWDN GND
VPS
VOUT
BFIN
SGM834A
Keithley 236
INPT
Characterization Board
VSUM VPDB VREF
VLOG
Ribbon
Cable
*Signal: INPT
Guard: VSUM
Shield: Ground
DC Matrix, DC Supplies, DMM
Figure 3. Primary Characterization Setup
HP 3577A
Network Analyzer
OUTPUT
INPUT
INPUTA
INPUTB
SGM834A
1
14
13
12
11
10
9
+IN
B
A
GND
AGND
2
3
4
5
6
7
AD8318
Evaluation
Board
PWDN
VSUM
INPT
BFNG
VPS
Power
Splitter
+VS
0.1μF
VOUT
VPS
VSUM
VPDB
VREF
BFIN
VLOG
8
49.9Ω
Figure 4. Buffer Amplifier Bandwidth Measurement
SG Micro Corp
www.sg-micro.com
FEBRUARY 2022
11
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
