A 6-12 GHz Push-Pull GaN Amplifier for Low Harmonic Drive Applications

This paper presents a fully integrated 6-12 GHz GaN MMIC push-pull amplifier for low harmonic drive applications. A folded Marchand balun is used to perform the unbalanced-balanced and balanced-unbalanced transformations. The three-stage push-pull amplifier provides in excess of 28 dB of small signal gain at a quiescent bias point of 25V, 200mA. The minimum saturated output power across the 6-12 GHz bandwidth is 32.3 dBm. The worst case second harmonic level under a saturated operating condition is -40 dBc, demonstrating the capability of the push-pull amplifier to suppress the even order harmonics, especially when the second harmonic is within the amplifier bandwidth.

[1]  Z. Popovic,et al.  Analysis of High-Efficiency Power Amplifiers With Arbitrary Output Harmonic Terminations , 2011, IEEE Transactions on Microwave Theory and Techniques.

[2]  Anh-Vu Pham,et al.  Wide-Bandwidth Power-Combining and Inverse Class-F GaN Power Amplifier at X-Band , 2013, IEEE Transactions on Microwave Theory and Techniques.

[3]  Claudio M. Montiel,et al.  Folded Marchand Balun Design and Validation Using Sonnet , 2012 .

[4]  Hong-Yeh Chang,et al.  Analysis of Multiconductor Coupled-Line Marchand Baluns for Miniature MMIC Design , 2007, IEEE Transactions on Microwave Theory and Techniques.

[5]  Hua Wang,et al.  A 5.2-to-13GHz class-AB CMOS power amplifier with a 25.2dBm peak output power at 21.6% PAE , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).