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Dual Phase-locked Loop

The HF2LI-PLL is an option for the HF2LI and essentially provides a dual programmable digital phase-locked loop which enables fast frequency tracking. Zurich Instruments offers the world's fastest digital PLL, with a unique frequency range of up to 50 MHz using direct sampling technology. In combination with the multi-frequency and the AM/FM modulation options, the HF2LI can be considered as a ground breaking measurement tool for all advanced oscillation applications. The PLL from Zurich Instruments sets new standards in terms of operating range, bandwidth, programmability, and features.

Key Features

* Dual programmable fully digital phase-locked loop
* Configurable phase detector and PID controller
* Fully integrated with dual-unit lock-in instrument
* PLL bandwidth programmable in a wide range
* Best-in-class harmonic input & harmonic output distortion
* Output of frequency deviation on auxiliary output connectors
* Easy to use PLL Advisor tool
* Option upgradeable in the field

Compatibility to Other Options

* Compatible to HF2LI-MOD AM/FM Modulation option

User Benefits

* Enabling technology for multi-modal oscillations up to 50 MHz
* Single-box harmonic and higher modes analysis
* Plug & play into any existing microscopy setup
* Direct 50 MHz photodiode connection (bias and signal) with HF2TA Current Amplifier
* AFM publications and application know-how


* Scanning Probe Microscopy (SPM)
* Atomic Force Microscopy (AFM)
* Kelvin Probe Force Microscopy (KPFM)
* Micro & Nano Electro Mechanical Systems (MEMS, NEMS)
* Magnetometer Characterization

Functional Diagram


Configuration dual-PLL
Frequency range 1 Hz - 50 MHz
Programmable center frequency 1 Hz - 50 MHz
Programmable PLL bandwidth (1 MHz operation) 16 Hz - 50 kHz
Programmable PLL bandwidth (100 kHz operation) 16 Hz - 10 kHz
Typical phase noise (at 100 Hz) <100 dBc/Hz


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