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

fYear

1992

Firstpage

59

Lastpage

62

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Bipolar/BiCMOS Circuits and Technology Meeting, 1992., Proceedings of the 1992

Conference_Location

Minneapolis, MN

Print_ISBN

0-7803-0727-5

Type

conf

DOI

10.1109/BIPOL.1992.274082

Filename

274082