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Continuous-time CMOS adaptive asynchronous ΣΔ modulator approximating low-ƒs low-inband-error on-chip wideband power amplifier

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5 Author(s)
Alarcon, E. ; Electron. Eng. Dept., UPC Barcelona Tech, Barcelona, Spain ; Fernandez, D. ; Garcia i Tormo, A. ; Madrenas, J.
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A mixed-signal continuous-time-processing standard CMOS implementation of an asynchronous sigma-delta modulator aimed to drive a switching amplifier operating as an on-chip wideband adaptive power supply is presented in this work. The paper first briefly discusses the fundamental limit tracking capabilities of a two-level switching signal to inband- error-free track a bandlimited signal with minimum average switching frequency. It is argued the adequacy of an adaptive asynchronous sigma-delta modulator (AAΣΔ) to approximate such fundamental characteristics. The second part of the paper presents mixed-signal design details of the various subcircuits implementing a CMOS low-power digitally-programmable AAΣΔ modulator, with 7 MHz average switching frequency operation and 1000 μm × 640 μm area occupancy.

Published in:

Circuits and Systems (ISCAS), 2011 IEEE International Symposium on

Date of Conference:

15-18 May 2011