A wideband amplifier with a fine control of the true-time delay (TTD) has been successfully implemented using a commercial 0.5-챙m GaAs pHEMT monolithic microwave integrated circuit (MMIC) process. The proposed circuit effectively combines switching elements into an artificial transmission line structure in a distributed amplifier to achieve an adjustable TTD which enables time delay control with gain in a wider band than other GaAs-based TTD circuits. The TTD amplifier MMIC achieves a controllable delay of 9 ps, a gain of 9 to 2 dB, and a typical return loss of more than 10 dB from 4 to 20 GHz. The proposed TTD amplifier can be effectively integrated into a multifunction chip based on GaAs semiconductors for wideband active electronically scanned array or phased array systems.
KSP Keywords
Active electronically scanned array(AESA), Distributed amplifier(DA), Fine control, GaAs PHEMT, Microwave Integrated Circuits(MICs), Microwave monolithic integrated circuits(MMIC), Phased array systems, Return Loss, Switching element, Time Delay Control, Wideband amplifier
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