Learn More
A high-performance GaAs HVHBT WCDMA/WiMAX base-station power amplifier is presented, which uses an envelope tracking bias system to achieve high linearity and efficiency. The measured overall power-added efficiency (PAE) reached 58%, with a normalized power RMS error of 2.9% and ACLR1 of -49 dBc with digital predistortion (DPD), at an average output power(More)
A two-way symmetrical Doherty amplifier exhibiting 250 W saturated power has been developed using high-voltage HBT (HVHBT) GaAs technology biased at 28 V on the collector. Greater than 57% collector efficiency at 50 W (47 dBm) average output power has been demonstrated while achieving -55 dBc linearized ACPR at 5 MHz offset using a two-carrier-side-by-side(More)
A record high-performance GaAs high-voltage HBT (HVHBT)-based WCDMA base-station power amplifier is presented, which uses an envelope tracking bias system to achieve high efficiency and linearity. A wideband envelope amplifier provides dynamic collector supply biasing to the RF stage. A digital pre-distortion technique is employed to satisfy the linearity(More)
A new generation of High Voltage Heterojunction Bipolar Transistor (HVHBT) technology was developed for base station high power amplifiers and multi-stage driver amplifiers. This is an improved version of previously reported InGaP/GaAs HBT capable of operating with supply voltages up to 32 V. Generation 2 HVHBT technology maintains the same high level of(More)
A two stage high power amplifier consisting of a 325W High Voltage HBT (HVHBT) Doherty final and a 20W LDMOS Doherty driver has been developed for use in wireless basestation applications. The lineup achieved greater than 54% PAE at 75W (48.77dBm) average output power with 30dB gain while achieving -55dBc linearized ACPR at 5MHz offset using a 2C11 WCDMA(More)
A 2-way symmetrical Doherty amplifier achieving 600W saturated power has been developed using Generation 2 High-Voltage HBT (Gen 2 HVHBT) GaAs technology. In this paper we will show the development method used for this design work. From module optimization to final Doherty design this method is centered on highly accurate high power load pull. Operating at(More)
A dual channel broadband surface mount optical modulator driver has been developed for use in 100Gb/s fiber optic transponders. Each channel is capable of delivering 4 to 8Vpp to each port of the optical modulator at data rates spanning through 43Gb/s with adjustable crossing point and eye quality control. This surface mount package solution enables a more(More)
  • 1