Switched-capacitor high-frequency bandpass ΣΔ modulators could suffer from capacitor mismatch, finite opamp dc gain, and finite opamp bandwidth. These problems make the notch frequency and the quality factor of the zeros of the noise transfer function to deviate from their nominal values, strongly affecting the modulator dynamic range (DR). In order to avoid this situation, two sampled-data algorithms have been developed which allow to self-calibrate the bandpass ΣΔ modulators. They use 3500 gate and 0.043 mm2 area and consume power only when they are active, while, when the system is on, they are off and do not interfere with standard operation. The validity of the proposal is demonstrated by a silicon prototype in which the proposed solution allows to guarantee a 75-dB DR performance also under worst case conditions. In the particular case, it allows for the recovery of 3 dB in the SNR for the 200-kHz FM band (from 73 to 76 dB).

Gandolfi, G., Colonna, V., Annovazzi, M., Stefani, F., Baschirotto, A. (2004). Self-tuning algorithms for high-performance bandpass switched-capacitor ΣΔ modulators. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS. I, REGULAR PAPERS, 51(1), 170-174 [10.1109/TCSI.2003.821299].

Self-tuning algorithms for high-performance bandpass switched-capacitor ΣΔ modulators

BASCHIROTTO, ANDREA
2004

Abstract

Switched-capacitor high-frequency bandpass ΣΔ modulators could suffer from capacitor mismatch, finite opamp dc gain, and finite opamp bandwidth. These problems make the notch frequency and the quality factor of the zeros of the noise transfer function to deviate from their nominal values, strongly affecting the modulator dynamic range (DR). In order to avoid this situation, two sampled-data algorithms have been developed which allow to self-calibrate the bandpass ΣΔ modulators. They use 3500 gate and 0.043 mm2 area and consume power only when they are active, while, when the system is on, they are off and do not interfere with standard operation. The validity of the proposal is demonstrated by a silicon prototype in which the proposed solution allows to guarantee a 75-dB DR performance also under worst case conditions. In the particular case, it allows for the recovery of 3 dB in the SNR for the 200-kHz FM band (from 73 to 76 dB).
Articolo in rivista - Articolo scientifico
Algorithms; Analog to digital conversion; Bandpass filters; Calibration; Capacitors; Delta sigma modulation; Sampled data control systems; Signal to noise ratio; Switching circuits; Transfer functions
English
2004
51
1
170
174
none
Gandolfi, G., Colonna, V., Annovazzi, M., Stefani, F., Baschirotto, A. (2004). Self-tuning algorithms for high-performance bandpass switched-capacitor ΣΔ modulators. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS. I, REGULAR PAPERS, 51(1), 170-174 [10.1109/TCSI.2003.821299].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/36819
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