Patent ID: 8013636
Filing Date: 2011-09-06
Classification: G01R,H03L,H03M

Abstract:
1. Circuit of an electrothermal filter coupled to a phase detection circuit ( 50 ; 60 ; 70 ; 72 ; 74 ; 76 ; 78 ) arranged to function as a sigma-delta modulator, for determining a phase difference between a response signal (sv) of the electrothermal filter and a driving signal (sdr) of the electrothermal filter, the response signal and the driving signal having an equal frequency (f 0 ;fdr), comprising: an electrothermal filter; a source input node (in) coupled to the electrothermal filter and configured to receive the response signal whose phase relationship with respect to the driving signal is to be determined; a feedback signal generator ( a phase difference circuit ( an integrator circuit ( a digitizing circuit (