Title :
QPSK modulators for digital cellular communication
Author :
Flower, Gordon ; Dugan, Richard ; Zhang, Jim ; Chang, Justin ; Petruno, Pat
Author_Institution :
Hewlett-Packard, Palo Alto, CA, USA
Abstract :
Two quaternary-phase-shift-keying (QPSK) modulator ICs are described. These devices use a dual conversion architecture and image rejection techniques to integrate the modulation and upconversion functions of a digital cellular transmit chain. They feature low power dissipation and wideband operation while maintaining suppression of higher harmonics. For 2nd through 4th harmonics, 30 dBc of suppression are guaranteed. For the 5th harmonic and higher harmonics, 50 dBc are required. The modulation carrier is suppressed by greater than 30 dB as well. A sleep state dissipating less than 60 mW can be activated by applying a voltage to a single pin. A second version of the modulator includes an on-chip 90-degree phase shifter. Both devices are packaged in surface-mount small-outline packages
Keywords :
bipolar integrated circuits; cellular radio; digital radio systems; modulators; phase shift keying; 60 mW; ICs; QPSK modulators; digital cellular communication; dual conversion architecture; image rejection techniques; low power dissipation; on-chip 90-degree phase shifter; quaternary-phase-shift-keying; sleep state; small-outline packages; surface-mount; upconversion functions; wideband operation; Digital modulation; Image converters; Packaging; Phase modulation; Power dissipation; Power system harmonics; Quadrature phase shift keying; Sleep; Voltage; Wideband;
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting, 1992., Proceedings of the 1992
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-0727-5
DOI :
10.1109/BIPOL.1992.274082
