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We developed a 10.7 MHz intermediate frequency bandpass discrete-time 4th-order 4-bit DeltaSigma modulator for AM/FM car radio tuners. Using direct feed-forward compensation 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 mm2 , in 0.15 mum CMOS technology, and draws 63 mA of current.
We developed a 10.7-MHz intermediate frequency (IF) bandpass discrete-time (DT) 4th -order 4-bit ΔΣ 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 mm2, in 0.15 μm CMOS technology, and draws 63 mA of current.
A second-order multi-bit switched-capacitor complex bandpass DeltaSigmaAD modulator has been designed and fabricated for application to low-IF receivers in wireless communication systems such as Bluetooth and WLAN. We propose a new structure of a complex bandpass filter in forward path with I, Q dynamic matching which is equivalent to the conventional one but it can be divided into two separate parts...
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