MMIC Chipset Development for LO Block for 54 GHz Millimetre Wave Test Instrumentation

MMIC implementation for a high frequency add-on unit to a Test & Measurement product is discussed in this paper. To get the highest possible spectral purity to test a DUT. A spur-free and high Fundamental, 3rd & 4th Harmonics suppressed LO lineup has been implemented in 40-67 GHz range. This LO signal feeds a mixer to up & down convert a test signal. LO lineup has >60 dB fundamental (1H), 3rd (3H) and 4th (4H) suppression. The lineup output power stays constant to +17dBm with large input drive power variation -10 to 0dBm thus eliminating use of Digital Step Attenuator (DSA) for power calibration purpose. The lineup design also helps to reduce jump in drive current with large input RF drive power.