An interpolative bandpass converter on a 1.2 mu m BiCMOS analog/digital array

Switched-capacitor bandpass delta-sigma A/D modulation at 10.7 MHz

“…These bandwidths are suitable for broadcast and voice AM, IS-54 cellular telephony and GSM telephony respectively. Another device obtained a SNR performance with a centre frequency [6] and bandwidth using off-chip inductors as resonators.…”

“…This study focuses on switched-C technology because it is proven for high resolution and linearity at baseband and because it is a monolithic technology capable of delivering precision analog performance. Inductor- [6][9] [10] or transconductor-based [5] technologies can be expected to dominate at very high speeds, but are more difficult in that they involve off-chip components or tuning; their linearity is also compromised by "intersymbol interference" effects in the pulse feedback used as well as in the loop filter. Switched-C should be expected to dominate up to some upper bandwidth limit, and this work helps estimate that limit.…”

A CMOS fully-differential bandpass ΣΔ modulator using switched-current circuits

“…Realizations of bandpass CA modulators using continuous-time circuits with off-chip LC resonators [4] and monolithic discrete-time switched-capacitor (SC) circuits [5-71 have been reported. These latter prototypes featured center frequencies in the range of 455kHz to 10.7MHz, bandwidths in the range of lOKhz to 200Khz, and resolutions in the range of 9 to 14bit, in BiCMOS [7] or double-poly CMOS technology [5-61.…”