1-Watt Conventional and Cascoded GaN-SiC Darlington MMIC Amplifiers to 18 GHz

RLC Matched GaN HEMT Power Amplifier with 2 GHz Bandwidth

“…In a MMIC or flip-chip hybrid configuration, resistive feedback has been used in conjunction with cascode devices [8], Darlington amplifiers [9], and ft-multipliers [10] to obtain higher gain or even wider bandwidth. However power levels have been typically below 3W and the efficiencies reported are typically less than 25%.…”

Linearized CMOS Darlington Feedback Amplifier for Wireless Communications

“…The proposed fully-integrated CMOS Darlington feedback amplifier eliminates the need for off-chip discrete components and is suitable for wireless IoT sensor network applications [2]. Other published Darlington amplifier work ([3], [4], [5], [6]) are designed in PHEMT and GaN semiconductor process that is not as cost effective as CMOS process for mass production. Other published Darlington amplifier work [7], [8] does not provide sufficient bandwidth of operation to cover lower spectrum bands.…”

2-Watt broadband GaN power amplifier RFIC using the &#x0192;<inf>T</inf> doubling technique

“…PA's that use class E and F topologies have excellent power efficiency [1], [2] and are attractive for mobile phones, for example, because they are battery-operated. Meanwhile, in cases where linearity and broadband performance are paramount then the class A topology is a suitable choice [3], [4] if there is enough dc power available and if proper measures are taken to dissipate the excess heat. Applications that can benefit from class A PA's include high-performance test equipment and cellular base stations that must handle large numbers of simultaneous phone calls.…”