Masumi Kasahara

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INTRODUCTION RAPID advancement of semiconductor integrated-circuit technology has reduced the cost of mobile telecommunication terminals year by year. The global systems for mobile communications (GSM), 1) which was standardized mainly by European countries, has enhanced the large scale integration of radio-frequency
We developed a 10.7-MHz intermediate frequency (IF) bandpass discrete-time (DT) 4<sup>th</sup> -order 4-bit &#x00394;&#x003A3; modulator for AM/FM car radio tuners. Using direct feed-forward and double sampling, we have achieved a dynamic range (DR) of 112 dB in the 3-kHz AM bandwidth (BW) and a DR of 94 dB in the 200-kHz FM BW. The modulator occupies 3(More)
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