The CA5350 realizes unprecedented high gain and broad bandwidth support from DC to 14 kHz at 10¹⁰ V/A, and from DC to 70 kHz at 10⁹ V/A. In addition, it also supports high-speed signals from DC to 500 kHz at 10⁶ V/A or less..

Gain-frequency characteristics

Gain can be set in seven ranges of 10⁴, 10⁵, 10⁶, 10⁷, 10⁸, 10⁹, 10¹⁰ (V/A), in x10 increments.
This enables the optimal gain setting to match the current and sensor values that vary depending on the measurement conditions.
In addition, if an output amplifier gain of x10 is used, a maximum gain setting of 10¹¹ V/A is possible.

The fast response of 0.7 μs at 10⁶ V/A gain enables support for fast pulse response signal processing in optical systems.
Our unique circuit design technology enables stable operations even with the capacitance of the connecting cables and sensors, eliminating any concerns about oscillation.
In addition, overshoot and ringing do not occur even for pulse responses.
By achieving both fast response and broad bandwidth, as well as stable operation even with additional capacitance on the input side, the CA5350 supports a variety of sensor types.

Pulse response characteristics (Gain: 10⁹ V/A)

Conventional Current Amplifier

CA5350

(X-axis: 100 μs/div., Y-axis: 2 V/div.)

(X-axis: 20 μs/div., Y-axis: 2 V/div.)

For photodiodes and photo transistors, in the absence of incident light, a weak current called a dark current will flow.
In a current amplifier with high gain, a small DC current input becomes a large voltage when output, and the amplifier is saturated and measurement becomes impossible.
The built-in suppression current source is adjustable to cancel the input of such dark current.
The current suppression setting can be selected in six ranges from ±8 nA to ±800 μA.
In addition, the auto-suppression function can be used to automatically set the range and current value required to suppress the dark current.

Current suppression setting screen

Built-in filters and DC power supply
The CA5350 achieves an ultra-low noise with an input-referred noise of 2.5 fA/√Hz (at 10¹⁰ V/A, 55 Hz).
In addition, in order to remove noise components and to improve the signal-to-noise ratio (SN ratio), the built-in filter can be set to a response speed in the range of 1 μs to 300 ms to optimize the SN ratio and response speed depending on the application.
And furthermore, in our pursuit of the low noise operation that is essential to the amplification of a weak current, we have adopted a low noise DC power supply in the power supply section using our own unique technology.

Filter response speed (rise time)
setting screen

Interfaces, input and output terminals
The standard-equipped USB and GPIB interfaces support remote control and integration of the CA5350 into an automatic measurement system.
Since input and output terminals are provided on both the front and rear panels, you can choose the terminals depending on how you are connecting to sensors or other equipment.
In addition, the half-rack size makes the integration of multiple units easy.

Bias power supply −8 V to +8 V
Bias power supply for applying a bias voltage to a variety of sensors

Display backlight brightness setting
3-level setting, including OFF
Enables use in light-sensitive experiments.

Setting memory: 10 sets