Title :
A full duplex 1200/300 bit/s single-chip CMOS model
Author :
Shapiro, Garry R. ; Pindar, Andrew C E
Abstract :
The design of a Bell 212A (AT&T) compatible single-chip modem is described, and measured results are presented. The IC(Fairchild /spl mu/A212A) contains all signal-processing functions and supports all operating modes, including test modes and selection of either 1200 bit/s QPSK or 300 bit/s FSK operation. The modem offers such features as a coherent digital receiver, call-progress toner monitoring, 8-11 bit character lengths for asynchronous operation, and on-chip handshaking for the remote loopback test mode. Only connect and disconnect sequences are user-provided typically by a (generic) microcontroller.
Keywords :
CMOS integrated circuits; Frequency shift keying; Modems; Phase shift keying; frequency shift keying; modems; phase shift keying; CMOS integrated circuits; Demodulation; Filters; Microcontrollers; Modems; Quadrature amplitude modulation; Quadrature phase shift keying; Remote monitoring; Semiconductor device modeling; Transmitters;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1985.1052455
