Title :
A CMOS IF transceiver with reduced analog complexity
Author :
Paulus, Tod ; Somayajula, Shyam S. ; Miller, Thad A. ; Trotter, Brian ; Choi, Kyong ; Kerth, Donald A.
Author_Institution :
Crystal Semicond. Corp., Austin, TX, USA
fDate :
12/1/1998 12:00:00 AM
Abstract :
Signal processing techniques are used to minimize the analog complexity in an intermediate-frequency (IF) transceiver. The receiver digitizes the IF signal directly by subsampling and complex bandpass delta-sigma modulation. A new loop filter is proposed for use in the complex delta-sigma. Digital demodulation and filtering are then used to extract the baseband information. The transmit section converts baseband to IF through an all-digital signal path. A bandpass delta-sigma modulator quantizes the digital IF signal to 1 bit in order to simplify the IF output digital-to-analog converter/driver. The output driver provides analog finite impulse response filtering for quantization noise
Keywords :
CMOS integrated circuits; circuit complexity; delta-sigma modulation; mixed analogue-digital integrated circuits; transceivers; CMOS IF transceiver; all-digital signal path; analog complexity; analog finite impulse response filtering; bandpass delta-sigma modulator; digital demodulation; digital filtering; digital-to-analog converter; digitization; loop filter; output driver; quantization noise; signal processing; subsampling; Band pass filters; Baseband; Delta-sigma modulation; Demodulation; Digital filters; Finite impulse response filter; Information filtering; Information filters; Signal processing; Transceivers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
