HF2CA Key Features
- 100 MHz wide bandwidth for highly capacitive sources
- 2 independent amplification channels
- Precision input impedance for accurate source matching
- Variable input impedance for accurate source matching
- Differential input for improved signal integrity
- Extremely low noise and low input leakage
- Dedicated interface to HF2 Instruments (no direct PC link)
HF2CA Resources
HF2CA Compatible Instruments
HF2CA Applications
- Electrical impedance spectroscopy
- Dielectric impedance spectroscopy
- Conductivity detection
- Capillary ion analysis
HF2CA Functional Diagram
Differential Input, Differential Output
The amplifier features 2 differential input and 2 single- ended output connectors. This permits to amplify differential and single-ended input signals, but also to combine both amplification paths into one differential output signal. For single-ended operation the negative input connector is switched either to amplifier ground internally or to an external ground provided by the application. This permits to use the amplifier in a large common mode range.
JFET Input Amplifier
The HF2CA is based on JFET input amplifiers which provide very low-noise over a wide frequency range. Additionally, the ultra-low input bias current of typically 2 pA allows for precise current measurements at small signal amplitudes.
Single Connector to HF2 Series
The HF2CA ideally fits to the HF2 Instruments with its single connector providing both power supply and remote control. The HF2CA is automatically detected by the HF2 Series instruments when it is connected and all settings can be controlled from the graphical user interface.
Settings
Configurable settings include the input impedances (R1, R2), the output voltage gain (G), the switch for differential input operation (Single/Diff), and the DC coupling switch to prevent the propagation of 50/60 Hz noise.
HF2CA Specifications
Frequency Response | |
frequency range (3 dB cut-off) | DC - 100 MHz (depends on R1,R2 settings) |
frequency range with AC coupling | 100 Hz - 100 MHz (depends on R1,R2 settings) |
small signal bandwidth (0.1 Vpp) | 100 MHz |
large signal bandwidth (1 Vpp) | 40 MHz |
Input | |
input noise voltage (10 kHz) | 7 nV/√Hz |
input noise current | depends on R1,R2 settings |
input leakage current | 2 pA |
input capacitance | 30 pF |
input impedance (R1,R2) | 10 V/A - 1 MV/A |
input current range | depends on R1,R2 settings |
common mode voltage range | -10 V to 7.5 V |
Gain | |
gain accuracy | ±0.1% (G=1) |
maximum offset | 1 mV |
output voltage gain (G) | G=1 or G=10 |