140dB Range (1nA to 10mA)
SGM834A
Logarithmic Current-to-Voltage Converter
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
TJ = +25℃ and VP = 5V, unless otherwise noted.
Spot Noise Spectral Density at VLOG vs. IPD
Spot Noise Spectral Density at VLOG vs. Frequency
1000
100
10
1000
100
10
100Hz
1kHz
10kHz
100kHz
1MHz
10MHz
1
1
1nA
10μA
100μA
1mA
10nA
100nA
1μA
0.1
0.1
0.01
10mA
0.01
0.001 0.01 0.1
1
10
100 1000 10000
0.1
1
10
100
1000
10000
IPD (μA)
Frequency (kHz)
Total Wide-Band Noise Voltage at VLOG vs. IPD
Small Signal Response of Buffer
22
20
18
16
14
12
10
8
3
0
-3
-6
6
G = 1
-9
G = 2
4
G = 2.5
G = 5
2
0
-12
0.001 0.01
0.1
1
10
100 1000 10000
0.1
1
10
100
1000 10000 100000
IPD (μA)
Frequency (kHz)
Small Signal Response of Buffer Operating as Two-Pole Filter
Logarithmic Conformance Error Distribution
2
1.5
1
10
TJ = +25℃
fC = 1kHz
0
-10
-20
-30
-40
-50
-60
-70
Mean + 3σ
0.5
0
-0.5
-1
Mean - 3σ
-1.5
-2
0.001 0.01
0.1
1
10
100 1000 10000
0.01
0.1
1
10
100
Frequency (kHz)
IPD (μA)
SG Micro Corp
FEBRUARY 2022
www.sg-micro.com
7
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
