Title :
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
fDate :
3/1/1995 12:00:00 AM
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
