论文信息 - An 80MHz 8th-Order Bandpass DS-Modulator with a 75DB SNDR for IS-95

An 80MHz 8th-Order Bandpass DS-Modulator with a 75DB SNDR for IS-95

A fully-differential 8th-order cascade bandpass AC-modulator is presented. The circuit is implemented using only two Opamps and operates at a sampling frequency of 80MHz.- The circuitcan be used in an IF-receiver to combine frequency downconversion with analog to digital conversion by directly sampling an input signal from an intermediate frequency of 6OMHz to a digital intermediate frequency of 20MHz. The measured peak SNDR is 75dB for a 1.25MHz bandwidth (IS-95). The circuit is implemented with a 0.35um CMOS technology and consumes 37mW from a 3.0V supply.

T. Salo | Saska Lindfors | Kari Halonen

[1] A. Hairapetian,et al. An 81 MHz IF receiver in CMOS , 1996, 1996 IEEE International Solid-State Circuits Conference. Digest of TEchnical Papers, ISSCC.

[2] Gabor C. Temes,et al. Switched-capacitor resonator structure with improved performance , 2001 .

[3] Saska Lindfors,et al. A low-voltage single-Opamp 4th-order band-pass /spl Delta//spl Sigma/-modulator , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).