Amplified, large-area (7 mm2) photodetector based on a Si photodiode, with fast response and Johnson-noise limited performance. A low-noise JFET isolates the photodiode capacitance from a fast (140 MHz) op amp configured as a transimpedance amplifier, allowing speed typically only found in detectors with an order of magnitude smaller sensor size. An integrated high slew-rate (1.3 V/ns) line driver delivers up to 9 Vpp into a 50 Ω load. The module is packaged in a standard lens tube with 1.035"-40 threads for convenient integration. The sensor head includes an ultra low noise voltage regulator and can be powered directly from a ±12V lab bench supply or a commercially available power brick via a 3-pin M8 connector.
Regular price$289.00Sale price$289.00
Large Area Fast Amplified Si Photodiode
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Large area Si PIN photodiode
Compact package (1-inch diameter lens tube) for convenient integration
Fast response (61 ns rise time)
High gain (0.2 V/µW @ 850nm)
High speed line driver for large amplitude output into 50 Ω
Dynamic range from pW to µW
Johnson-noise limited from 250 Hz to 100 kHz
Sensitive synchronous detection
Fast time domain monitoring
Characterization of faint diffuse radiation
The sensor head comprises a Si PIN photodiode, a JFET input stage, a transimpedance amplifier, and an output stage capable of driving a 50 Ω load. The photodiode is reverse biased so incident light is converted to a photocurrent. This photocurrent is converted to a voltage by a transimpedance amplifier with a large feedback resistor (330 kΩ). A JFET follower drives the anode of the photodiode. This reduces the effective input capacitance at the op amp summing junction and boosts the detection bandwidth. The transimpedance amplifier is AC coupled to a low-noise, high-voltage, current-feedback amplifier configured as a non-inverting 3 dB gain stage capable of driving 9 Vpp into 50 Ω. When driving a high impedance load the sensor gain is 660 kV/A and 330 kV/A when used with a 50 Ω terminator. The signal output is via a SMA RF coax connector.
Contact us to discuss custom solutions, pricing and lead-time. Example customizations include:
Measured power spectral density. Below 100 kHz, noise (77 nV Hz-1/2) is flat and dominated by the Johnson noise of the 330 kΩ feedback resistor. At higher frequencies, the noise increases linearly up to the rolloff frequency of the amplifier. For a derivation of Johnson noise and application to a transimpedance amplifier see our tutorial.
High Dynamic Range Optical Density Measurement with a Synchronous Amplifier
In this video, we’ll use a synchronous amplifier (Eikonal SA-01) to make high dynamic range measurements of the transmission of an optical component. We’ll use a modulated laser diode (Eikonal LDFC-01) as a light source, and a large area amplified photodiode (Eikonal TIA-F-01) as the photodetector. In this example, we’ll measure the optical transmission of laser safety glasses. We'll use the Eikonal modules as a system to make measurements sensitive to a part in 10,000.
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