ANALOG TO DIGITAL CONVERTER WITH LOW OUT OF BAND PEAKING
First Claim
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1. A delta sigma modulator configured to receive an input signal, the delta sigma modulator comprising:
- low pass filter circuitry configured to generate first and second signals responsive to the input signal;
an integrator configured to generate a third signal responsive to the first signal from the low pass filter circuitry; and
loop filter circuitry configured to generate a fourth signal responsive to the second signal from the low pass filter circuitry and the third signal from the integrator.
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Abstract
An analog to digital converter includes a delta sigma modulator with a modified distributed feed-forward (DFF) topology. The modulator includes low pass filter circuitry that provides a first path to a first integrator and a second, feed-forward path to a second integrator that significantly reduce the out of band signal transfer function (STF) peaking of the modulator.
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Citations
20 Claims
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1. A delta sigma modulator configured to receive an input signal, the delta sigma modulator comprising:
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low pass filter circuitry configured to generate first and second signals responsive to the input signal; an integrator configured to generate a third signal responsive to the first signal from the low pass filter circuitry; and loop filter circuitry configured to generate a fourth signal responsive to the second signal from the low pass filter circuitry and the third signal from the integrator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A communications device comprising:
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a first low pass filter configured to output a first signal in response to an input signal; a second low pass filter configured to output a second signal in response to the input signal; an integrator configured to output a third signal in response to the first signal; and loop filter circuitry configured to output a fourth signal in response to the second signal and the third signal. - View Dependent Claims (12, 13, 14, 15)
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16. A media system comprising:
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a communications device configured to receive an analog input signal and generate an output signal, the communications device includes; low pass filter circuitry configured to generate first and second signals responsive to the analog input signal; an integrator configured generate a third signal responsive to the first signal from the low pass filter circuitry; loop filter circuitry configured to generate a fourth signal responsive to the third signal from the low pass filter circuitry and the third signal from the integrator; analog to digital circuitry configured to generate a fifth signal responsive to the fourth signal from the loop filter circuitry and the third signal from the integrator; and processing circuitry configured to generate the output signal responsive to the fifth signal from the analog to digital circuitry; a processing unit configured to generate a media signal in response to the output signal from the communications device. - View Dependent Claims (17, 18, 19, 20)
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Specification