Title :
Dynamic range extension technique for high-order ΣΔ ADCs by digital level control
Author :
Lee, Dong-Yun ; Kim, Min-Kyu ; Shim, Dae-Yun ; Kim, Wonchan
Author_Institution :
Sch. of Electron. Eng., Seoul Nat. Univ., South Korea
fDate :
12/4/1997 12:00:00 AM
Abstract :
A new architecture is presented for a high-order multi-bit ΣΔ ADC which does not require a precision multi-bit DAC in the feedback loop. Local digital level control is employed to extend integrator output dynamic range. A prototype fourth-order modulator is simulated with circuit non-idealities, showing an SNR of ~110 dB
Keywords :
circuit feedback; integrating circuits; sigma-delta modulation; SNR; circuit nonidealities; digital level control; dynamic range extension technique; feedback loop; fourth-order modulator; high-order ΣΔ ADCs; integrator output dynamic range; multi-bit convertors;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19971455
