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RF Modulator

The INRADIOS Vector Modulator is a broadband quadrature modulator designed for operation from 400 MHz to 4.4 GHz (opt. up to 6 GHz). Its excellent phase accuracy and amplitude balance enable high performance intermediate frequency or direct radio frequency modulation for communication systems. The Tx Gain ranges 30dB and can be adjusted in 0.25dB steps from -35dBm up to -5dBm

The Vector Modulator features a broad baseband bandwidth, along with an output gain flatness that varies no more than 1 dB from 450 MHz to 3.8 GHz. These features, coupled with a broadband output return loss of <−14 dB, make the INRADIOS Vector Modulator ideally suited for broadband zero IF or low IF-to-RF applications, broadband digital predistortion transmitters, and multiband radio designs.

The Vector Modulator accepts two differential baseband inputs and a single-ended LO. It generates a single-ended 50 Ω output. The performance such as LO leakage and I/Q imbalance can be further optimized digitally. INRADIOS will also provide Software and HDL code samples in order to start integration of the INRADIOS Vector Modulator instantaneously.

The INRADIOS Vector Modulator operates at +-5V supply and has a power consumption of less than 4W. It comes in a milled aluminum case with the physical dimensions of about 112x78x12 (mm^3) without connectors. The performance is specified over a −40°C to +85°C temperature range.



  • RF/IF output frequency range from 400 MHz to 4.4 GHz (opt. up to 6GHz)
  • Rx Gain of 70dB in 0.25dB steps, fully digitally controlled
  • 10MHz reference input



  • Satellite communications
  • Digital pre-distortion
  • Rapid prototyping
  • Mobile user equipment
  • Base stations
  • Broadband wireless access and
  • Different test equipments

Definition of Radio frequency and Base band interface

Parameter Values
Operating RF frequency 400MHz to 4.4GHz (opt. up to 6GHz)
IQ3dB bandwidth up to 750MHz
Port impedance 50 Ohm
Output power (CW) -35dBm to -5dBm
power step size 0.25dB
Tx Gain range 30dB
Output return loss less than 14dB from 450MHz to 4.5GHz
Noise floor -160dBm/Hz @ 900MHz
Sideband suppression  less than -50dBc @ 900MHz
Carrier feedthrough  less than -40dBm @ 900MHz
Base band input 4dBm/+-2dB
Phase Noise -89dBc/Hz @10kHz offset from 2.2GHz carrier
  -114dBc/Hz @100kHz offset from 2.2GHz carrier
  -134dBc/Hz @1MHz offset from 2.2GHz carrier
  -83dBc/Hz @10kHz offset from 4.4GHz carrier
  -110dBc/Hz @100kHz offset from 4.4GHz carrier
  -132dBc/Hz @1MHz offset from 4.4GHz carrier