Title :
Oversampling architecture for analog harmonic modulation
Author :
Edwards, R. Timothy ; Cauwenberghs, Gert
Author_Institution :
Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA
fDate :
8/1/1996 12:00:00 AM
Abstract :
We propose a technique for sinusoidal modulation of analog signals, which requires neither multiplication nor analog sine wave generation. The modulating signal is an oversampled representation of a sine in the form of a periodic binary sequence, optimized to minimize intermodulation distortion. A 2-to-1 multiplexer performs the modulation multiplication. With third-order low-pass filtering of the input signal, the technique achieves 60 dB of linear dynamic range for a sequence of length 256, conveniently generated with an 11-address decoder and an 8-b counter
Keywords :
analogue processing circuits; binary sequences; modulation; signal sampling; analog signal; harmonic modulation; intermodulation distortion; linear dynamic range; multiplexer; oversampling architecture; periodic binary sequence; sinusoidal modulation; third-order low-pass filtering; Binary sequences; Decoding; Dynamic range; Filtering; Intermodulation distortion; Low pass filters; Multiplexing; Nonlinear filters; Power harmonic filters; Signal generators;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
