Balanced I/Q Modulator (Up-Converter) with LPF

DC to 4GHz broadband Radio Frequency (RF) inputs
4GHz LPF for RF inputs
Up to 18GHz Local Oscillator (LO) inputs
Broadband DC to 18GHz Intermediate Frequency (IF) output
Differential input linearity range up to 600mV p-p
30dB RF-to-IF isolation
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Frequency (min): DC
Frequency (max): 18 GHz
Power: 446 mW
Package: 44-pin CQFP
Price: Request

Product Details

asnt6150-kmm desc

Fig. 1 Functional Block Diagram

I/Q modulators are critical components in the signal chain of modern digital transmitters. I/Q modulators perform the frequency translation that moves a base-band signal to a desired location in the RF spectrum. The I/Q modulator shown in Fig. 1 accepts 2 local oscillator inputs LO1, LO2 representing in-phase (I) and quadrature (Q) components separated by 90°. These two signals are combined with I and Q baseband signals RF1, RF2 in two separate mixers. The outputs from both mixers are then summed to provide a modulated carrier IF. The chip includes two low-pass filters (LPF) for processing RF signals prior to their mixing with the corresponding LO signals.

The part’s output buffers support the CML-type interface with on chip 50Ω termination to vcc and may be used in either DC or AC coupling modes. The output common-mode voltage level of vcc-0.4V is guaranteed only in case of external single-ended 50Ω DC termination to vcc. The part’s input buffer supports the CML-type interface with equivalent on-chip 50Ω termination and can be used in either DC or AC coupling modes. In the first mode, the input signal’s common-mode voltage should comply with the specifications in the electrical characteristics section of the part’s datasheet. In the AC-coupling mode, the input termination provides the required common-mode voltage automatically. The differential signaling mode is recommended for optimal performance.