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UHF-MOD AM/FM 변조

  • 개요
  • 기능 다이어그램
  • 사양

AM/FM 변조 옵션에 의해서 최대 3개의 오실레이터 주파수에서의 위상 동기화된 선형 결합 신호의 생성이 가능합니다. 진폭 변조(AM)와 주파수 변조(FM)을 포함한 다양한 변조 방식에서(보다 고차원의) 측파대 직접 계측을 간편하게 설정할 수 있습니다. 탠덤 복조와 같은 통상 이중 복조 방식과는 달리, 여러 기기가 필요하지 않고, 최대 가능 복조 대역폭에 의한 변조 주파수의 제한은 없습니다.

UHF-MOD 주요 특징

  • Two independent AM/FM modulation units with 3 frequency components each
  • Amplitude modulation and demodulation (simultaneous)
  • Frequency modulation and demodulation (simultaneous),
  • Adjustable filter settings for each frequency component
  • Dual-modulator (signal output) configuration
  • Harmonic sideband analysis (2 sidebands)
  • Sideband separation (single-sided modulation)

UHF-MOD 업그레이드 및 호환성

UHF-MOD 기능 다이어그램



UHF-MOD Amplitude Modulation

\(s(t)=[A_c + A_m * \sin(\omega_m t) ] * \sin(\omega_c t)\)

In AM the amplitude of a carrier signal is periodically changing (modulated). In most applications this modulation is small and is 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 UHF-MOD uses 3 demodulators to demodulate all 3 frequencies simultaneously providing a best-in-class signal recovery performance. Simultaneous amplitude modulation and demodulation is supported and can be entirely controlled from the graphical user interface of the UHF Instrument. The generation of AM signals is useful for stimulus generation in the application, but can also be utilized for system testing purposes.

UHF-MOD Frequency Modulation

\(s(t)=\sin[\omega_ct +\frac{\omega_p}{\omega_m} *\sin(\omega_mt) ]\)

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 UHF Instrument is capable to demodulate a signal of interest at several frequencies simultaneously, and the UHF-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 shall satisfy the relation ωpm << 1, but the UHF-MOD option operates also above this limit with a decreasing accuracy, i.e. ωpm < 2.

UHF-MOD User Benefits

  • Single-box solution for bimodal, multi-modal measurement challenges, no intermediate signal conversion
  • Easy to set up
  • Simultanously 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 UHF-PID option and External Reference allows that carrier and modulation frequency can be derived from a high-performance PLL and/or external source
  • Ability to dicriminate signals from upper and lower sidebands
  • Results can be added and subtracted with Arithmetic Unit

UHF-MOD 사양

AM and FM Specifications
ωc, fc: carrier frequency range 6 µHz - 600 MHz
ωm, fm: modulation frequency range 6 µHz - 600 MHz
ωs, fs: sideband frequency fs = m * fc ± n * fm
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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  • 청년친화 강소시업
사업자등록번호 : 220-86-72761대표이사 : 신동만대표전화 : 070-7872-0701팩스 : 02-2167-3801
(우)07299 서울특별시 영등포구 경인로 775 (문래동 3가, 에이스하이테크시티 3동 2층)