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Dr. Steffen Bittner
Dr. Marco Krondorf
+49 351 340 907-0
+49 351 340 907-99

RF Demodulator

INRADIOS Vector Demodulator

The INRADIOS Vector Demodulator is a broadband quadrature I-Q demodulator that covers an RF/IF input frequency range from 400 MHz to 4.4 GHz (opt. up to 6GHz). The output bandwidth is up to 390MHz for use in different applications such as satellite communications, mobile user equipment, base stations, broadband wireless access and different test equipment featuring best in-class performance. The Rx Gain ranges 70dB and can be adjusted in 0.25dB steps and can be fully digitally controlled.

With a NF of less than 6dB, IP1dB = 11.6 dBm, and IIP3 = 29.7 dBm @ 900 MHz. The INRADIOS Vector Demodulator offers an outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF inputs provide a well-behaved broadband input impedance of 50 Ω.

Excellent demodulation accuracy is achieved with amplitude and phase balances of ~0.07 dB and ~0.2°, respectively, which can further be digitally optimized. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered and provide a voltage conversion gain of ~7 dB. The buffered baseband outputs are driving a 1 V p-p signal (opt. 2V p-p).

The fully balanced design minimizes effects from second-order distortion. The leakage from the LO port to the RF port is <−50 dBm. Differential dc offsets at the I and Q outputs are typically 65 dBm. Further improvements can be achieved by the use of an additional 10MHz reference clock.

The INRADIOS Vector Demodulator 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. As Input / Output connectors one can choose between SMB or MCX. INRADIOS also provides Software and HDL code samples in order to start integration of the INRADIOS Vector Demodulator instantaneously.



  • RF/IF input 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
  • Rapid prototyping
  • Mobile user equipment
  • Base stations
  • Broadband wireless access 
  • Different test equipments


Definition of Radio frequency and Base band interface

Parameter Values
Operating RF frequency 400MHz to 4.4GHz (opt. up to 6GHz)
Demod bandwidth up to 390MHz
Port impedance 50 Ohm
Input power (CW) -70dBm to -10dBm
Input power step size 0.25dB
RX Gain range 70dB
Input IP3  30dBm@900MHz, 28dBm@1900MHz
Input IP2 >65dBm@900MHz
Input P1dB 11.6dBm@900MHz
Noise figure 6dB
Accuracy@900MHz Phase: ~0.2°
  Amplitude: ~0.07dB
Base band output 1V p-p (opt. 2V p-p)
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