Balanced I/Q Modulator (Up-Converter)

DC to 4GHz broadband Radio Frequency (RF) inputs
Up to 18GHzLocal 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
All inputs are differential CML-type with 50Ohm on-chip termination
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Frequency (min): DC
Frequency (max): 18 GHz
Power: 430 mW
Package: 44-pin CQFP
Price: Request

Product Details

asnt6151-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 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 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 electrical characteristics section of the part’s datasheet. In the second mode, the input termination provides the required common-mode voltage automatically. The differential DC signaling mode is recommended for optimal performance.