MF-MOD AM/FM Modulation

The AM/FM modulation option allows generation of phase-coherent linear combinations of up to 3 oscillator frequencies. The direct measurement of (higher-order) sidebands in a variety of different modulation schemes, including amplitude modulation (AM) and frequency modulation (FM), can be conveniently set up in the LabOne® user interface. Unlike conventional double demodulation schemes, e.g. tandem demodulation, the user will not need multiple instruments and is also not limited in modulation frequencies by the maximum available demodulation bandwidth.

EUR 1,300.00
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MF-MOD Key Features

  • Amplitude modulation (AM) and demodulation (simultaneous)
  • Frequency modulation (FM) and demodulation (simultaneous)
  • Adjustable filter settings for each frequency component
  • Sideband separation (single-sided modulation)
  • Analysis of higher-order sidebands and multiple carrier frequency

MF-MOD Upgrade and Compatibility

  • Can be upgraded in the field, no hardware changes required
  • Requires the MF-MD Multi-demodulator option
  • Compatible with all other MFLI and MFIA options

MF-MOD Functional Diagram

MF-MOD Amplitude Modulation

In AM the amplitude of a carrier signal is periodically changing (modulated). In most applications, this modulation is small and therefore subject to noise. The purpose of recovering an AM signal with a lock-in amplifier is to take advantage of its steep filters and time integration to extract the signals of interest. As the AM spectrum consists of 3 frequency components, the MF-MOD uses 3 demodulators to demodulate all 3 frequencies simultaneously providing the best-in-class signal recovery performance. Simultaneous amplitude modulation and demodulation is supported and can be entirely controlled from the LabOne user interface of the MF Instrument. The generation of AM signals is useful for stimulus generation in the application, but can also be utilized for system testing purposes.

MF-MOD Frequency Modulation

In FM the frequency of a carrier signal is periodically changing (modulated). As the modulation is often a small signal and therefore subject to noise, the demodulation with a lock-in amplifier can be advantageous thanks to its configurable filtering. The MF Instrument is capable of demodulating a signal of interest at several frequencies simultaneously, and the MF-MOD option provides the FM demodulation at the carrier frequency and a selectable pair of sidebands (ωc ± n * ωm). For narrow-band operation, the peak frequency deviation and the modulation frequency should satisfy the relation ωpm << 1, but the MF-MOD option operates also above this limit with a decreasing accuracy, i.e. ωpm < 2.

MF-MOD User Benefits

  • Single-box solution for bimodal, multi-modal measurement challenges, no intermediate signal conversion
  • Easy to set up
  • Simultaneously obtain X, Y, R and Θ for up to 3 phase coherent frequency components (not possible with tandem demodulation)
  • Modulation frequencies are not limited by the maximum demodulation bandwidth (tandem demodulation)
  • Compatibility with MF-PID option and External Reference allows the carrier and modulation frequency to be derived from a high-performance PLL and/or external sources
  • Ability to discriminate signals from upper and lower sidebands

MF-MOD Specifications

AM and FM Specifications
ωc, fc: carrier frequency range 210 nHz to 500 kHz; 210 nHz to 5 MHz, requires MF-F5M option
ωm, fm: modulation frequency range 210 nHz to 500 kHz; 210 nHz to 5 MHz, requires MF-F5M option
ωs, fs: sideband frequency fs = m * fc ± n * fm; with fs < max ωc
Ac: amplitude of carrier signal Ac < Vrange
m,n: harmonic analysis m,n = 1 to 32
AM Specifications
hAM: AM modulation index hAM = Am / Ac
Am: amplitude of modulation signal Ac + Am < Vrange
FM Specifications
hFM: FM modulation index hFM = fp / fm
ωp, fp: peak frequency deviation demodulation fp < 2 * fm
ωp, fp: peak frequency deviation modulation fp < 12'000 * fm

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