An analog/digital interface for cellular telephony

Author

Maulik, Prabir C. ; Van Bavel, Nicholas ; Albright, Keith S. ; Gong, Xue-Mei

Author_Institution

Crystal Semicond. Corp., Austin, TX, USA

Volume

30

Issue

3

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

201

Lastpage

209

Abstract

This paper describes a mixed-signal ASIC for dual-mode (analog/digital) cellular telephony applications. It consists of two transmit and two receive channels corresponding to the I and Q channels of a quadrature phase-shift keying (QPSK) modulation system. It also includes three 8 b DAC´s for control purposes, as well as a bandgap voltage reference and bus interface circuitry. The chip is part of a four-chip implementation of an IS-54 dual mode telephone. The chip was implemented in a 0.8 μm n-well double-metal CMOS process and uses a 5 V power supply. The die area of the chip was 23 mm² and the average power consumption was 125 mW

Keywords

CMOS integrated circuits; cellular radio; digital-analogue conversion; mixed analogue-digital integrated circuits; quadrature phase shift keying; sigma-delta modulation; 0.8 micron; 125 W; 5 V; CMOS chip; DAC; IS-54 dual mode telephone; QPSK modulation system; analog/digital interface; bandgap voltage reference; bus interface circuitry; cellular telephony; mixed-signal ASIC; n-well double-metal process; phase-shift keying; quadrature PSK; receive channels; transmit channels; Application specific integrated circuits; CMOS process; Energy consumption; Phase modulation; Phase shift keying; Photonic band gap; Power supplies; Quadrature phase shift keying; Telephony; Voltage control;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.364433

Filename

364433