This powerful product integrates two 50 MHz phase-locked loops (PLLs) with two independent 50 MHz lock-in amplifiers. The PLLs offer fully configurable support for accurate frequency tracking, whereas the lock-in amplifiers provide best-in-class signal recovery.
50 MHz Phase-Locked Loop
Key Features
- Dual 50 MHz PLL
- 2 fully configurable lock-in amplifiers
- 2 high-frequency, high-performance signal generators
- 50 kHz PLL bandwidth with full parameter control
- 4 fully configurable PID controllers
- PLL harmonic mode
- Frequency deviation and dissipation output (jitter-free)
Price
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Documents
The HF2PLL Phased-Locked Loop is a bundle consisting of the following products:
- HF2LI Lock-in Amplifier
- HF2LI-PLL option
- HF2LI-PID option
- Atomic force microscopy (AFM)
- Scanning tunneling microscopy (STM)
- Near-field scanning optical microscopy (SNOM, NSOM)
- Micro-electromechanical systems (MEMS)
- Resonators and magnetometers
- Frequency combs: time reference definition
- Semiconductor characterization and testing
High-precision inputs
The 2 input paths of the HF2PLL are optimized for very low noise operation. The sampling rate of 210 MSa/s is 4 times the analog bandwidth, ensuring full capture of the signal and reducing aliasing.
Quad PID controller
The efficient implementation of control loops is supported by 4 fully configurable PID controllers with a wide selection of input and output units. The advisor and tuning tools simplify the tedious optimization of control parameters. The maximum bandwidth depends on the chosen configuration, but is at least 5 kHz per PID controller for any application.
Demodulators and filters
The HF2PLL comes with 6 dual-phase demodulators. Each demodulator can be configured with its own filter properties. The advantages of digital vs. analog instruments include higher dynamic reserve, zero drift, precise phase shifts, and orthogonality. An integrated toolset provides comprehensive analysis functionalities. The internal oscilloscope, with memory for 2048 samples, gives access to immediate signal vs. time plots. The Sweeper tool can function as a frequency response analyzer for high-resolution signal vs. frequency plots, as well as a sweeper over other internally controlled quantities such as voltages or time constants. The FFT Spectrum Analyzer enables high-resolution signal analysis on frequency spans of up to 200 kHz. Finally, the HF2PLL Advisor and the PID Advisor ensure efficient closed-loop parameter settings.
Application pack
A selection of product options unlock many additional modes of operation and measurement. In particular, the HF2LI-MF and the HF2LI-MOD options provide the multi-harmonic mode (MHM), dual frequency resonance tracking (DFRT), frequency modulated Kelvin probe force microscopy (FM-KPFM) and Q-Control. Both of these options are field-upgradeable.
PLL operation modes
| Constant excitation | Yes |
| Constant amplitude | Yes, with automatic gain control |
| Q-control | Yes (option) |
| Kelvin probe feedback | Yes (option) |
| Frequency range | 1 Hz to 50 MHz |
| Center frequency | 1 µHz to 50 MHz |
| PLL bandwidth (1 MHz) | 16 Hz to 50 kHz |
| PLL bandwidth (100 kHz) | 16 Hz to 10 kHz |
| Phase noise (100 kHz at 100 Hz distance) | -100 dBc/Hz |
HF analog input
| Frequency range | 0.8 µHz - 50 MHz |
| Input voltage noise | 5 nV/√Hz above 10 kHz |
| Dynamic reserve | 120 dB |
| A/D conversion | 14 bits, 210 MSa/s |
HF analog output
| Frequency range | DC - 50 MHz |
| Output ranges | ±10 mV, ±100 mV, ±1 V, ±10 V |
| Signal adder | ±10 V, DC to 50 MHz bandwidth |
| D/A conversion | 16 bits, 210 MSa/s |
Demodulator and reference
| Number of demodulators | 6 dual-phase |
| Output sample rate | On USB: up to 460 kSa/s On auxiliary outputs: 1 MSa/s |
| Filter time constant | 1 µs - 500 s |
| Filter bandwidth | 80 µHz - 200 kHz |
| Filter slope | 6, 12, 18, 24, 30, 36, 42, 48 dB/Oct |
| Reference frequency resolution | 0.8 µHz |
| Reference phase angle resolution | 1.0 µ° |
General
| Dimensions | 45 x 35 x 10 cm (19" rack) |
| Weight | 6.2 kg |
| Power supply | 110-120 V, 220-240 V, 50/60 Hz |
| Operating temperature | +5 °C to +40 °C |
| PC operating systems | 32-bit and 64-bit version of Windows XP, Windows 7, Linux |
