Showing papers by "Neil Weste published in 2015"
24 May 2015
TL;DR: The generic design of the aptly named digital harmonic-cancelling sine-wave synthesizer (DHSS) is discussed along with parasitic extracted simulation results from a prototype designed in a 0.13 μm CMOS process, demonstrating that the DHSS prototype is capable of synthesizing up to 100 MHz output frequency, with 43.5 dB SFDR, while consuming only 2.26 mW of power.
Abstract: An on-chip sine-wave synthesizer design with fast programmability and low hardware cost is presented. The design makes use of a harmonic cancellation technique to digitally synthesize an approximation to a sine-wave, which does not contain lower order harmonic distortions. The remaining higher order harmonics are attenuated with the use of a low pass filter (LPF) to synthesize a spectrally pure sine-wave. The simple nature of the sine-wave synthesis approach allows for a design with low hardware cost while maintaining high output spectral purity. The generic design of the aptly named digital harmonic-cancelling sine-wave synthesizer (DHSS) is discussed along with parasitic extracted simulation results from a prototype designed in a 0.13 μm CMOS process. Simulation results demonstrate that the DHSS prototype is capable of synthesizing up to 100 MHz output frequency, with 43.5 dB SFDR, while consuming only 2.26 mW of power.
10 citations
10 May 2015
TL;DR: In this paper, the authors developed high frequency, high efficiency integrated supply modulators for airborne and space based high power amplifier modules, which were fabricated in commercial foundry GaN process and delivered 10W of output power with an efficiency of 83.5% while switching at a frequency of 100 MHz.
Abstract: This paper reports on the development of high frequency, high efficiency integrated supply modulators for airborne and space based high power amplifier modules. The power switches within the integrated modulators were RF HEMTs optimized for power amplifier applications. The modulators were fabricated in commercial foundry GaN process and delivered 10W of output power with an efficiency of 83.5% while switching at a frequency of 100 MHz. Development of high frequency supply modulators paves the way for integration of the HPA and modulators onto the MMIC die and on-chip drain bias modulation for efficiency enhancement of the HPA.
3 citations