A 35 GHz two-bit amplified phase-shifter

A combined two-bit phase-shifter and two-stage, 27-dBm power amplifier has been designed for Ka-band applications. The integration of these functions allows compact assemblies with low inter-stage losses to be realised while the use of a commercial 6-inch foundry reduces cost. High density applications are made more practicable through the high PAE achieved (40 to 45%), thus easing the heat management problems associated with phased-array applications at high frequencies. The typical mid-band RMS magnitude variation is 1.3 dB with an RMS phase error of 6 degrees, an input return loss of 10 dB and output return loss of 15 dB for all states. The MMIC size is 3.85 mm².