Title :
A frequency agile monolithic QPSK modulator with spectral filtering and 75 Ω differential line driver
Author :
Myers, Brent A. ; Bardsley, Scott ; Landy, Patrick ; Bell, Timothy ; Ross, Robert
Author_Institution :
Harris Semicond., Melbourne, FL, USA
fDate :
9/1/1998 12:00:00 AM
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 256 kbit/s with a carrier range of 8.096-20.128 MHz in 32 kHz steps. Maximum output level is 62 dBmV into a 75 Ω load. The features of 1.2 μm mixed signal BiCMOS technology permit both signal processing and power line drivers to be collocated while achieving better than 85 dB cross-talk isolation
Keywords :
BiCMOS integrated circuits; FIR filters; driver circuits; frequency agility; modulators; quadrature phase shift keying; 1.2 micron; 256 kbit/s; 75 ohm; 8.096 to 20.128 MHz; BiCMOS technology; analog quadrature modulator; carrier generator; crosstalk isolation; differential line driver; digital baseband pulse shaping network; digital signal processing; frequency agile monolithic QPSK modulator; spectral filtering; spectral shaping; transmit power control; wireline transmission interface; Baseband; Digital modulation; Digital signal processing; Filtering; Frequency; Phase modulation; Pulse modulation; Pulse shaping methods; Quadrature phase shift keying; Signal processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
