Driving the future of technology : Original solution in measurement and control
Driving the future of technology : Original solution in measurement and control
Programmable Current Amplifier
Programmable Current Amplifier
CA5351
Various applications from beam position monitoring in synchrotron radiation to quantum
electronics,
semiconductor, MEMS and Biochemistry research.
▲ CA5351
The model CA5351 programmable current amplifier is a current input-voltage
output preamplifier with variable gain. It achieves a measurement system with
both high gain and wide bandwidth, which cannot be found anywhere else.
Resonance does not occur even in the presence of cable or sensor capacitance
because of its unique input circuit design and technology.
And there is no
overshoot or ringing in the response of pulse input as well. With high gain,
wide bandwidth, fast response and low noise features, the model CA5351 is an
ideal solution for a variety of small current measurements.
1010 V/A: DC to 14 kHz, 109 V/A : DC to 70 kHz
The model CA5351 achieves a measurement system with both high gain and wide
bandwidth, that cannot be found anywhere else. The bandwidth is from DC to
500kHz with a response time of 0.7 μs (gain: 106 V/A or less), so high-speed signal
amplification is possible.
103/104/105/106/107/108/109/1010 (V/A) 8 selectable amplification ranges in decade increments, which allows the most suitable gain setting according to the sensor used and measurement environment.
A high-speed response of 0.7 μs is possible with a gain of 106 V/A.
Model CA5351 can process fast pulse signals in optical system measurements.
Resonance does not occur even in the presence of cable or sensor capacitance becaue
of its unique input circuit design and technology.
Also there is no overshoot or ringing in the response of pulse input.
Fast response, wide bandwidth and stability towards input capacitance makes this
model suitable for various types of sensors.
When gain is 106 V/A, the rise time is 0.480 μs.
Gain: 109 V/A, Cs: Input-GND capacitance
■ Input current range of CA5351 (S/N ratio: 20dB or more)
In photoelectric conversion elements such as photodiode and
phototransistor, a small current called dark current flows through even when there
is no incident light.
In high-gain current amplifiers, when a small DC current
input is amplified to a large voltage output, the amplifier becomes saturated, which
makes the measurement impossible.
The model CA5351 also incorporates a stable
and low noise suppression current supply with high resolution. This current supply
can add or offset the input current.
For example, by eliminating dark current
or leakage current, it can cause higher SN ratio to make the signals detectable. The
"Auto Suppression" function automatically changes the current suppression range even
if unwanted DC current fluctuates.
● No Current Suppression
Output saturates when the gain is more than 106 V/A
● With Current Suppression
By eliminating 10μA of the current, the gain can be set to 106 V/A, therefore it becomes possible to measure more detailed fluctuations of signals.
The Model CA5351 has acheived the ultimate low noise value with an equivalent input
noise of 2.5 fA/√Hz (at 1010 V/A, 55
Hz)
In addition, a built-in filter is incoroporated with 12 settings in 1 to 3 sequences
within the response speed of 1μs to 300 ms, which eliminates the noise and improves
the SN ratio.
The optimum SN ratio and response speed can be used for different
applications.
Furthermore, the incorporated DC low noise power supply utlizes NF's very unique
technology in order to pursue and qualify the required low noise level for small
current amplifications.
High-quality Performance Supported with Data
The Model CA5351 offers wide bandwidth, high gain
and low noise all at the same time, which allows the greatest performance in
making tradeoffs.
In the below graph, it shows the comparison data of the Model CA5351 vs.
products of other manufacturers.
Horizontal axis shows the higher the cutoff frequency is, the wider the
bandwidth is.
( Data by NF, September 2020)
● Display Backlight Brightness
4 levels of brightness adjustable or OFF
It can be used in experiments that are sensitive to light.
● Up to 10 savable settings
● Overdetection
Detects excessive signals and displays the conditions.
Detects current-voltage converted signals (input overdetection) and output connector
signals (output overdetection) and displays them separately.
With high gain, wide bandwidth, fast response and low noise features, the CA5351 is ideal for a variety of small current measurements
Specifications download (281KB)
