CMX971 Datasheet, PDF (15/25 Pages) CML Microcircuits – Small 16-lead VQFN Package

Quadrature Modulator
8 Application Notes
8.1 Impedance Matching Information
8.1.1 LO Input
The impedance to the LO input (LO pin) is shown in Figure 6.
CMX971
Figure 6 LO Impedance
8.2 Modulator Operation
This quadrature modulator is designed to operate with a maximum I/Q input level of 1Vp-p for either
single-ended or differential operation. The device offers excellent modulation accuracy with accurate
phase and amplitude balance and also low carrier leakage.
The variation in output level with frequency is typically 2dB, as shown in Figure 7, where the output level is
shown for an I/Q input of 1Vp-p 7kHz sine and cosine waves. The LO input level is -10dBm.
 2015 CML Microsystems Plc
15
D/971/4