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TIASim

TIASim - Transimpedance Amplifier Simulation.

For some example designs and comparisons to TIASim see One Inch Phototdetector.

Analog Devices has a Photodiode Circuit Design Wizard at https://tools.analog.com/en/photodiode/

References

op-amps

Open-loop gain, input-referred voltage and current noise, and input-capacitance are modeled for the following op-amps:

Op-amp Input Bandwidth Inp Capacitance Supply Voltage
OPA657 FET 1.6 GHz 5.2 pF 13 V
OPA859 FET 1.8 GHz 0.8 pF 5 V
OPA818 FET 2.7 GHz 2.4 pF 13 V
OPA847 BJT 3.9 GHz 3.7 pF 13 V
OPA858 FET 5.5 GHz 0.8 pF 5 V
OPA855 BJT 8 GHz 0.8 pF 5 V
LTC6268-10 FET 4 GHz 0.55 pF 5 V

These integrated TIAs might be good for comparisons: HMC799 (10kOhm, 700 MHz, TIA), LTC6560 (74 kOhm, 220 MHz)

Photodiodes

Photodiode Material Capacitance Active area Notes
Hamamatsu S5973 Si 1.6 pF D=0.4 mm
Hamamatsu S5971 Si 4.0 pF D=1.2 mm
Thorlabs FDS015 Si 0.65 pF D=0.15 mm FCI-125G-006HR
Thorlabs FDS025 Si 0.94 pF D=0.25 mm Ball lens, FCI-125G-010HRL
Thorlabs FGA01FC InGaAs 2.0 pF D=0.12 mm FC-connector, INGAAS-120L-FC
Thorlabs FGA015 InGaAs 1.5 pF D=0.15 mm
Fermionics FD80FC InGaAs 0.4 pF D=0.08 mm FC-connector

OPA818

https://www.ti.com/lit/ds/symlink/opa818.pdf

This image compares TIASim predicted bandwidth vs. photodiode capacitance and transimpedance to the datasheet front-page Figure. Note that the TIASim CF values are increased by a sqrt(2) factor. CF is the capacitance across RF.

opa818-bw-image

This image shows measured and predicted dark and bright noise levels for an OPA818 photodetector with 1.2 kOhm transimpedance and 0.7 pF CF. The Photodiode is a Thorlabs FDS015. The -3dB badwidth is >400 MHz.

opa818-1k2-image

OPA657

http://www.ti.com/lit/ds/symlink/opa657.pdf

opa657-image

This OPA657 photodetector with S5791 photodiode and 1 MOhm transimpedance shows 4 MHz bandwidth. Note that this design has no output-buffer, and the TIASim predicted response was adjusted to fit the measurement data by de-rating the op-amp GBWP.

opa657-1M-image

This OPA657 detector with S5793 photodiode and 10 kOhm transimpedance (0.2 pF CF) shows ca 60 MHz bandwidth.

opa657-10k-image

OPA847

http://www.ti.com/lit/ds/symlink/opa847.pdf opa847-image

OPA855

http://www.ti.com/lit/ds/symlink/opa855.pdf

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