US 7,321,324 B2
Unconditionally stable analog-to-digital converter
Alessandro Piovaccari, Austin, Tex. (US)
Assigned to Silicon Laboratories Inc., Austin, Tex. (US)
Filed on Nov. 10, 2005, as Appl. No. 11/270,908.
Claims priority of provisional application 60/695587, filed on Jun. 30, 2005.
Prior Publication US 2007/0001881 A1, Jan. 04, 2007
Int. Cl. H03M 3/00 (2006.01)
U.S. Cl. 341—143  [341/139; 341/155; 375/316] 17 Claims
OG exemplary drawing
 
1. A delta-sigma modulator comprising:
a complex loop filter coupled to recieve an incoming signal, wherein the incoming signal comprises in-phase and quadrature-phase signals, the complex loop filter having a plurality of integration stages, the complex loop filter designed to have a signal transfer function constrained to be below a maximum signal transfer function peak that can be incurred at a predetermined maximum value of the incoming signal without causing instability the delta-sigma a modulator, and
a quantizer coupled to the complex loop filter to receive an output of the complex loop filter and to generate quantized output.