Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2008-01-22
2008-01-22
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S120000
Reexamination Certificate
active
07321325
ABSTRACT:
A primary delta-sigma modulator converts a continuous-time input signal into a discrete-time output sequence. A calibration circuit comprising an auxiliary delta-sigma modulator estimates percentage error in an integrator time constant and adjusts the time constant of at least one integrator in the primary delta-sigma modulator accordingly. The auxiliary delta-sigma modulator and the primary delta-sigma modulator use integrators with substantially similar circuit designs. The percentage error in the time constant of the integrator in the auxiliary delta-sigma modulator, and correspondingly the percentage error in time constant of the integrator in the primary delta-sigma modulator, is estimated by injecting a calibrating sequence into the auxiliary delta-sigma modulator and examining a correlation between an error sequence and an output sequence of the auxiliary delta-sigma modulator.
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Hsieh Hong-Yean
Lin Chia-Liang
Knobbe Martens Olson & Bear LLP
Mai Lam T.
REALTEK Semiconductor Corp.
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