Abstract-Modern wireless telecommunication systems require high-efficient, linear, low cost and long talk-time solutions. The proposed novel balanced circuit for power amplifiers provides a high efficiency at maximum as well as backoff output power levels and low sensitivity to load variations. To minimize the quiescent current at low output power levels, an adaptive current-mirror bias circuit can be effectively used. Experimental results for highly efficient, linear, multi-band and multimode, two-stage, balanced switched-path SiGe HBT power amplifiers, intended to operate across the DCS 1800, PCS 1900, WCDMA 850 / 1900 / 2100 frequency bands, exhibit a peak poweradded efficiency of ≥ 50 % at 33 dBm and ≥ 20 % at 16 dBm of output power with a minimum quiescent current of 12 mA.
A CMOS line driver for the ISDN Primary Access Transceiver IPAT is presented. Operating in bridge configuration a driver pair delivers. 7.2 Vpp output voltage into a differential load of 22.8H at a data rate of 1.544 Mb/s (T1 application), using a single 5V supply voltage . The main feature of the single drivers is a control unit which stabilizes the quiescent current in the output stage at 20mA, while the peak output current is 180mA (T1). The circuit can also be logically configurated to deliver 6 Vpp into a differential load of 60i! with a quiescent current of 7mA and a data rate of 2.048 Mb/s (CEPT application). Because of its large output transistors, the driver pair occupies an area of 6500 square mils in a 2jim p-well technology.
Abstract-Modern wireless telecommunication systems require high-efficient, linear, low cost and long talk-time solutions. The proposed novel balanced circuit for power amplifiers provides a high efficiency at maximum as well as backoff output power levels and low sensitivity to load variations. To minimize the quiescent current at low output power levels, an adaptive current-mirror bias circuit can be effectively used. Experimental results for highly efficient, linear, multi-band and multimode, two-stage, balanced switched-path SiGe HBT power amplifiers, intended to operate across the DCS 1800, PCS 1900, WCDMA 850 / 1900 / 2100 frequency bands, exhibit a peak poweradded efficiency of ≥ 50 % at 33 dBm and ≥ 20 % at 16 dBm of output power with a minimum quiescent current of 12 mA.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.