Title :
A frequency agile monolithic QPSK modulator with spectral filtering and 75 Ohm differential line driver
Author :
Myers, Brent A. ; Bardsley, Scott ; Bell, Timothy ; Landy, Patrick ; Ross, Robert
Author_Institution :
Harris Corp., Melbourne, FL, USA
Abstract :
This monolithic modulator combines both digital signal processing and analog techniques to realize a high bit rate Quadrature Phase Shift Keyed (QPSK) modulator. It includes a digital baseband pulse shaping network, analog quadrature modulator, agile carrier generator, spectral shaping, and transmit power control for interfacing to wireline transmission media. Nominal data rates are 256kbit/s with a carrier range of 8.096 MHz to 20 MHz in 32 kHz steps. Maximum output power is 62 dBmV into a 75 Ohm load. The features of 1.2 micron mixed signal BiCMOS technology permit both signal processing and power line drivers to be collocated while achieving better than 80 dB crosstalk isolation
Keywords :
BiCMOS integrated circuits; crosstalk; driver circuits; frequency agility; mixed analogue-digital integrated circuits; modulators; pulse shaping circuits; quadrature phase shift keying; 1.2 micron; 256 kbit/s; 75 ohm; 8.096 to 20 MHz; agile carrier generator; analog quadrature modulator; bit rate; crosstalk isolation; differential line driver; digital baseband pulse shaping network; digital signal processing; frequency agile monolithic QPSK modulator; mixed signal BiCMOS technology; output power; power line drivers; spectral filtering; transmit power control; wireline transmission media; Baseband; Bit rate; Digital modulation; Digital signal processing; Filtering; Frequency; Phase modulation; Power generation; Quadrature phase shift keying; Signal processing;
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting, 1997. Proceedings of the
Conference_Location :
Minneapolis, MN
Print_ISBN :
0-7803-3916-9
DOI :
10.1109/BIPOL.1997.647428
