Amplifiers – Current and Voltage – with Low Noise & High Gain; Options for High Speed, Wide Bandwidth; Lock-In Amplifiers
FEMTO® amplifiers and photoreceivers all have very low noise and high gain. This makes them ideal as “sophisticated tools for signal recovery” in your scientific and industrial applications. The FEMTO® name says it all. If you are technical, you know that femto means 10 to the -15th. Many of the FEMTO amplifiers have internal noise levels at or less than that. Incredible! FEMTO® is a leading manufacturer of high quality low-noise amplifiers. Also, they are small so you can get them close to the work and keep the noise caused by the cables down.
FEMTO® amplifiers are developed and continually upgraded to be the best products available. All their products are designed and manufactured to strict standards to achieve these performance levels.
Let’s review the different classes of FEMTO amplifiers.
First the Current Amplifiers for high impedance devices like detectors and photodiodes. The FEMTO Current Amplifiers are variable and fixed gain amplifiers with transimpedance gains up to 10 to the 13th and noise levels down to 0.18 femto amps (WOW). Bandwidth choices are from DC to 200 Megahertz. A point to remember is as the bandwidth increases so does the noise.
For low impedance devices (less than 10Kohms) FEMTO has a series of Voltage Amplifiers, again with low noise the primary feature. The amplifiers include the DLPVA Low Frequency Series, the DHPVA Wideband Series and the High Speed GHz Series.
- Low Frequency Fixed and Variable Gain Voltage Amplifiers with DC to 100KHz bandwidth, low noise and gain up to 60dB.
- Wideband Voltage Fixed and Variable Gain Amplifiers with DC to 500MHz bandwidth, low noise and gain up to 60dB.
- A Logarithmic Wideband Voltage Amplifier.
- And for really fast signals High Speed GHZ Amplifiers up to 2.5GHz.
Products include:
- Current amplifiers – fixed & variable gain transimpedance amplifiers – TIA
- Voltage amplifiers – low frequency, wideband and logarithmic voltage amplifiers
- High Speed GHz amplifiers
- Custom amplifiers
- Photoreceivers – ultra-fast fixed & variable gain, custom photoreceivers (with or without photodetector modules)
- Balanced Photoreceivers
- Lock-in amplifiers
- Remote Power Supply
- Amplifier Interface Software
- Amplifier Accessories
FEMTO combines many of these amplifier with high performance photodiodes in a line of Photoreceivers from DC to 2GHz bandwidth. Balanced Photoreceivers with two amplifier paths detect the differential signals.
Custom Amplifiers and Photoreceivers are available for OEM applications.
FEMTO’s Compact Lock-In Amplifiers again make measurements easy.
One key accessory FEMTO manufactures is a series of Low Noise Cables that reduce the noise from your measurement setup even more. With the FEMTO small amplifiers close to your work and these cables, you can’t get a better measurement.
FEMTO offers customized solutions in any quantity.
OEM versions of every standard amplifier can be tailored to meet customer-specific requirements. A common application is the Custom Photoreceiver where a specific photodiode is integrated in the FEMTO amplifier. The noise and capacitive effects of the cable connecting the photodiode are eliminated. This significantly improves the overall performance of the photodiode / amplifier. Please contact us with your needs.
Use these guides/catalog/application notes to help you choose the best amplifier / photoreceiver for your application:
- FEMTO Amplifier Selection Guide (pdf)
- FEMTO Photoreceiver Selection Guide (pdf)
- Variable Gain Current Amplifier Comparison
- FEMTO Product Catalog (pdf)
- FEMTO Application Notes
Electro Optical Components ships all FEMTO orders FedEx 3 day, but only bills you at the FedEx Ground rate.
Current Amplifiers (TIA – Transimpedance Amplifier)
Ultra-Low Noise Current Amplifier
 | 3-dB Bandwidth (DC....) | Noise Current √Hz | Transimpedance Gain V/A | Remote Control |
|---|---|---|---|---|
| DLPCA-200 Variable Gain | 1.2 - 500 KHz | 4.3 fA - 13 pA | 1 x 1011 Max. | YES |
| DDPCA-300 | 1.5 - 450 Hz | 1.5 fA - 10 nA | 1 x 1013 Max. | YES |
| LCA-Series Fixed Gain | 1 Hz - 400 KHz | 0.18 - 65 fA | 1 x 1013 to 1 x 107 |
Variable Gain Low Noise Current Amplifier
 | 3-dB Bandwidth (DC....) | Noise Current √Hz | Transimpedance Gain V/A | Remote Control |
|---|---|---|---|---|
| DLPCA-200 | 1.2 - 500 KHz | 4.3 fA - 13 pA | 1 x 1011 Max. | YES |
| DDPCA-300 Series | 1.5 - 450 Hz | 1.5 fA - 10 nA | 1 x 1013 | YES |
High Speed Current Amplifier
 | 3-dB Bandwidth (DC....) | Noise Current √Hz | Transimpedance Gain V/A | Remote Control |
|---|---|---|---|---|
| DHPCA-100 Variable Gain | 0.22 - 200 MHz | 55 fA - 200 pA | 1 x 108 Max. | YES |
| HCA- Series Fixed Gain | 1 MHz - 200 | 270 fA - 4.5 pA | 1 x 106 to 2 x 104 |
Variable Gain High Speed Current Amplifier
 | 3-dB Bandwidth (DC....) | Noise Current √Hz | Transimpedance Gain V/A | Remote Control |
|---|---|---|---|---|
| DHPCA-100 | 0.22 - 200 MHz | 55 fA - 200 pA | 1 x 108 Max. | YES |
Charge Amplifiers
 | 3-dB Bandwidth (DC....) | Noise Current √Hz | Transimpedance Gain V/A | Remote Control |
|---|---|---|---|---|
| HQA-15M-10T | 250Hz - 15MHz | 90x10-21 C | 1 x 1013 Max. |
Voltage Amplifiers
Low Frequency Voltage Amplifier
 | Bandwidth | Input Noise √Hz | Gain | Remote Control |
|---|---|---|---|---|
| DLPVA-100- & 101-Series Varible Gain | DC - 100 KHz | 0.4 - 6.9 nV | 20 - 100 dB | YES |
Wideband Voltage Amplifier
 | Bandwidth | Input Noise √Hz | Gain | Remote Control |
|---|---|---|---|---|
| DHPVA- Series Variable Gain | DC - 200 MHz | 2.3 nV | 10 - 60 dB | YES |
| HVA - Series | DC - 500 MHz | 0.9 - 4.8 nV | 20 - 60 dB |
Logarithmic Wideband Voltage Amplifier
 | Bandwidth | Input Noise √Hz | Gain | Remote Control |
|---|---|---|---|---|
| HLVA-100 | 100MHz | 2 nV | 60 - 80 dB | YES |
Technical Notes: FEMTO Voltage Amplifier Comparison
High Speed GHz Amplifier
GHz-Wideband Amplifiers Catalog
 | Bandwidth | Input Noise √Hz | Gain | Remote Control |
|---|---|---|---|---|
| HSA-X Series | 10 KHz - 2.5 GHz | 330 - 670 pV | 20 - 40 dB | |
| HSA-Y Series | 10 KHz - 2 GHz | 330 - 680 pV | 20 - 60 dB | |
| DUPVA-1 Series Variable Gain | 1 KHz - 1.2 GHz | 330 - 450 pV | 20 - 70 dB | YES |
Custom Amplifers
Custom Amplifier Modules: Designed for your special amplifier requirement
Photoreceivers
Photoreceivers
 | Spectral Range | Bandwidth | Input Noise √Hz | Transimpedance Gain (V/A) | Input | Remote Control |
|---|---|---|---|---|---|---|
| FWPR-20 Series | 320 - 1700 nm | DC - 20 Hz | Down to 0.7 fW | 1011-1012 | Free Space | |
| PWPR-2K Series | 320 - 1700 nm | DC - 2 kHz | 9-10 fW | 1011-1012 | FS, FC, FSMA | |
| LCA-S-400K Series | 400 - 1700 nm | DC - 400 KHz | Down to 75 fW | 107 | Free Space | |
| OE-200 Series Variable Gain | 190 - 1700 nm | DC - 500 KHz | Down to 6 fW | 103 - 1011 | FC, Free Space | YES |
| OE-300 Series Variable Gain | 320 - 1700 nm | DC - 200 MHz | Down to 47 fW | 102 - 108 | FC, Free Space | YES |
High Speed Photoreceivers
 | Spectral Range | Bandwidth | Input Noise √Hz | Transimpedance Gain (V/A) | Input | Remote Control |
|---|---|---|---|---|---|---|
| HCA-S-200M Series - 200 MHz | 320 - 1700 nm | DC - 200 MHz | 6 - 12 pW | 2 x 104 | Free Space | |
| HCA-S-400M Series - 400MHz | 320 - 1700 nm | DC - 400 MHZ | 21-40 pW | 5 x 103 | Free Space | |
| HSA-X-S & HSPR-X Series - 2 GHz | 320 - 1700 nm | 10 KHz - 2 GHz | 14 - 26 pW | 5 x 103 | Free Space |
Balanced Photoreceivers
HBPR Series Balanced Photoreceivers Product Page
 | Spectral Range | Bandwidth | Min. Input Noise /√Hz | Transimpedance Gain (V/A) | Input | Remote Cti |
|---|---|---|---|---|---|---|
| HBPR-100M-60K-SI-FST | 320 - 1000 nm | DC - 100 MHz | 6.5 pW | 2.0 - 6.0x104 | FST | |
| HBPR-100M-60K-SI-FC | 320 - 1000 nm | DC - 100 MHz | 6.5 pW | 2.0 - 6.0x104 | FC | |
| HBPR-100M-60K-IN-FST | 800 - 1700 nm | DC - 100 MHz | 4.3 pW | 2.0 - 6.0x104 | FST | |
| HBPR-100M-60K-IN-FC | 900 - 1700 nm | DC - 100 MHz | 4.0 pW | 2.0 - 6.0x104 | FC | |
| HBPR-200M-30K-SI-FST | 320 - 1000 nm | DC - 200 MHz | 7.8 pW | 1.0 - 3.0x104 | FST | |
| HBPR-200M-30K-SI-FC | 320 - 1000 nm | DC - 200 MHz | 7.8 pW | 1.0 - 3.0x104 | FC | |
| HBPR-200M-30K-IN-FST | 800 - 1700 nm | DC - 200 MHz | 4.9 pW | 1.0 - 3.0x104 | FST | |
| HBPR-200M-30K-IN-FC | 900 - 1700 nm | DC - 200 MHz | 4.4 pW | 1.0 - 3.0x104 | FC | |
| HBPR-500M-10K-SI-FST | 320 - 1000 nm | DC - 500 MHz | 12 pW | 5.0 - 10.0x103 | FST | |
| HBPR-500M-10K-SI-FC | 320 - 1000 nm | DC - 500 MHz | 12 pW | 5.0 - 10.0x103 | FC | |
| HBPR-450M-10K-IN-FST | 800 - 1700 nm | DC - 450 MHz | 6.5 pW | 5.0 - 10.0x103 | FST | |
| HBPR-500M-10K-IN-FC | 900 - 1700 nm | DC - 500 MHz | 6.7 pW | 5.0 - 10.0x103 | FC |
Custom Photoreceivers
Custom Photoreceivers: Designed for your special photoreceiver requirement
Lock In Amplifier
 | Working Frequency | Time Constant | Sensitivity | Gain Accuracy | Remote Control | |
|---|---|---|---|---|---|---|
| LIA-MV-150 Series - Miniature Module | 10 Hz - 45 KHz | 3 ms - 10 s | 3µV - 100 nV | ±2% | YES | Standard or True Differential Input |
| LIA-MV(D)-200 Series Module | 5 Hz - 120 KHz | 300µs - 10 s | 3µV - 1 V | ±2% | YES | Single or Dual Phase |
| LIA-BV(D)-150 Series Plug in Board | 5 Hz - 120 KHz | 300µs - 10 s | 3µV - 1 V | ±2% | YES | Single or Dual Phase |
| SOM-1 Reference Oscillator Module | For LIA-MV(D)200 & LIA-BV(D)-150 | |||||
| SC-LIA-S Rack System | 8 slot LIA-BV rack system | |||||
| MK-LIA-3-A Module Housing | Housing for the LIA-BV(D) Series | |||||
Remote Low Ripple Power Supply
| PS-15-25-L (US) Low Ripple Power Supply | 120 VAC | |
| PS-15-25-L-(EU) Low Ripple Power Supply | 220 – 240 VAC | Replaces PS-15-2-L |
Amplifier Interface Software
LUCI-10 Interface Software: Windows PC
Accessories
- Low Noise Cable
- LIA-BV-150 Lock-in Amplifier Euro Connector
- LEMO Connectors
- Fiber Adapters and Photoreceivers Threaded Inputs
FEMTO Product Overview
Application Notes:
- Low noise cable
- Amplifier grounding
- Current Amplifier Care
- Output Load Match
- PMT & Current Amplifiers
- Amplifier Bias Details
- Amplifier Offset Details
- DC-Path BIAS-T for Fast Photodetectors
- Balanced Photoreceiver Block Diagram
- Custom Photoreceiver Questionnaire
- Lock-In Amplifier Application Notes
- SOM-1 External Control
- Amplifier Remote Control Operation
- Offset Adjustment for Current Amplifiers
- FEMTO DLPVA-101 Performance Technical Notes
Let’s review the different classes of FEMTO amplifiers.
First the Current Amplifiers for high impedance devices like detectors and photodiodes. The FEMTO Current Amplifiers are variable and fixed gain amplifiers with transimpedance gains up to 10 to the 13th and noise levels down to 0.18 femto amps (WOW). Bandwidth choices are from DC to 200 Megahertz. A point to remember is as the bandwidth increases so does the noise.
For low impedance devices (less than 10Kohms) FEMTO has a series of Voltage Amplifiers, again with low noise the primary feature. The amplifiers include the DLPVA Low Frequency Series, the DHPVA Wideband Series and the HSA High Speed GHz Series.
• Low Frequency Fixed and Variable Gain Voltage Amplifiers with DC to 100KHz bandwidth, low noise and gain up to 60dB.
• Wideband Voltage Fixed and Variable Gain Amplifiers with DC to 500MHz bandwidth, low noise and gain up to 60dB.
• A Logarithmic Wideband Voltage Amplifier.
• And for really fast signals High Speed GHZ Amplifiers up to 2.5GHz.
FEMTO combines many of these amplifier with high performance photodiodes in a line of Photoreceivers from DC to 2GHz bandwidth. Balanced Photoreceivers with two amplifier paths detect the differential signals.
Custom Amplifiers and Photoreceivers are available for OEM applications.
FEMTO’s Compact Lock-In Amplifiers again make measurements easy.
One key accessory FEMTO manufactures is a series of Low Noise Cables that reduce the noise from your measurement setup even more. With the FEMTO small amplifiers close to your work and these cables, you can’t get a better measurement.