Development of a low bit-rate voice over IP application is described. A speech coding algorithm is constructed and implemented on a digital signal processor (DSP). The algorithm is based on a sub-band mixed excitation LPC vocoder structure and operates at a rate of 2000 bits per second. Implementation is done on two TMS320C6701 floating point DSP’s each connected to a PC. On the PC, a graphical...

An efficiency-enhanced fully integrated power amplifier (PA) for wireless local area networks (WLANs) was implemented based on the GaAs heterojunction bipolar transistor (HBT) process. A harmonic tuning network that can absorb parasitic inductance of bonding wires is proposed, which reduces chip significantly. The provides nearly optimum fundamental and second impedances from 5.0 to 5.5GHz. Add...

Im Zeitalter explodierender Informationsverfügbarkeit wird ein Zusammenhang zwischen Informationsnutzung und Innovation erkennbar. Neben den konventionellen Organisationsformen der Wirtschaft existieren Netze, die diese Informationsflut hervorragend nutzen können. Kreuzkatalytische Netzwerke (KKN) sind solche Organisationsformen mit ausgezeichneter Innovationskraft. Anhand von Bespielen werden ...

—A 0.1–5.0 GHz 65 nm CMOS recongurable transmitter for private network wireless communications is presented. The transmitter integrates a 0.1–1.5 GHz high-efciency dual-mode power amplier to support low-cost narrowband applications and a 0.45–5.0 GHz efciency-optimized pre-power amplier to support high-performance wideband applications. A wideband PLL frequency synthesizer, DACs with recon...