The compact 20-channel amplifier unit consists of two 10 channel circuit boards. Each channel contains a low noise linear gain stage (32 dB), a high-pass equalizer (to flatten the frequency response) and a discriminator that outputs a standard current mode logic (CML) signal. RF connectors allow for direct plug-in of this 20-channel amplifier into the 20-channel G3PO vacuum feedthrough of the cryogenic system. This method of connection eliminates input cables that would potentially be susceptible to electromagnetic interference (EMI). Each of the 10-channel amplifier boards includes a standard QSE interface for differential twin-coaxial ribbon cables for direct interface to an FPGA. The whole unit, including the metal encasing, has dimensions of 55 × 30 × 58 mm3 and weighs 0.38 kg. Its power consumption is 4 W, operating from a single 3.3 V power supply. Together with the on-chip driver and the stripline ribbon cable, this interface amplifier has proven data transport from the ADC chip to the FPGA at 8 Gbps per channel.
- Low noise linear gain: 32 dB
- Input and output matched to 50 Ω
- Chip to FPGA at 8 Gbps
- Interface from Rapid Single Flux Quantum (RSFQ) logic to TTL and ECL systems
- Low-level signal instrumentation
- Multi-channel gain and phase matched for a variety of applications
- Dimensions: 55 mm x 30 mm x 58 mm
- Weight: 0.38kg
- Power Supplies: 3.3 V
- Power Dissipation: 4W
Specifications/ Performance
| Gain | 32 dB |
| Noise | dB |
| Wideband | DC to 8 GHz |
| Input Range | mVpp |
| Input Impedance | 50 Ω |
| Output Range | mV |
| Output Impedance | 50 Ω |
| Gain Accuracy | dB |
| Gain Flatness | dB |
| 3 dB Bandwidth | GHz |
| 1 dB Compression | dBm |
| Rise-time | pSec |
| Overload Recovery | μSec |
| Power Harness | |
| Connectors | 20 G3PO |