PROGRAMMABLE CIRCUIT COMPONENT STRATEGY USING A DUAL TONE MULTIPLE FREQUENCY TECHNIQUE.
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A technique for controlling circuit parameters based on an efficient dual-tone multiple-frequency (DTMF) method is presented. Only two filters with a timing circuit are required instead of the common seven bandpass filters to identify a valid tone pair. The proposed DTMF receiver circuit architecture using very-low-power-consuming devices is described. Filters using operational transconductance amplifiers operating in the weak inversion region with a power consumption of less than 2 mu W are implemented in this architecture. The circuit is being fabricated in CMOS monolithic form with the experimental results to be presented as soon as they are available.
author list (cited authors)
Garcia, G. W., Silva-Martinez, J., & Sanchez-Sinencio, E.