Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reissue Patent
2009-08-25
2010-10-19
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
Reissue Patent
active
RE041830
ABSTRACT:
A delta-sigma modulator includes a chopper-stabilized integrator, a quantizer having an input coupled to an output of the integrator, an input signal acquiring circuit controlled by a switched reference feedback circuit and having an output coupled to the input of the integrator, and a frequency-shaped pseudo-random chopper clock signal generator circuit including a pseudo-random sequence generator and producing a frequency-shaped pseudo-random clock signal. Resetting circuitry is coupled to reset inputs of the pseudo-random sequence generator to reset it in synchronization with the digital output of the chopper-stabilized delta-sigma modulator to prevent noise caused by wrap-around operation of the pseudorandom sequence generator. A logic circuit produces chopper clock signals in response to the frequency-shaped pseudo-random clock signal and applies them to various input switches and output switches of the integrator.
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Brady III Wade J.
Patti John J.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
Young Brian
LandOfFree
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