Feedforward delta-sigma modulator
First Claim
1. A feedforward delta-sigma modulator, comprising:
- a successive approximation analog-to-digital converter comprising N+1 input terminals, and an output terminal for outputting a digital signal, wherein an input terminal of the N+1 input terminals is used for receiving an analog input signal, and N is a positive integer;
a digital-to-analog converter coupled to the output terminal of the successive approximation analog-to-digital converter for receiving the digital signal, and generating an analog feedback signal accordingly;
N integrators, wherein an output terminal of each integrator of the N integrators is coupled to a corresponding input terminal of the N+1 input terminals;
a first adder coupled to the digital-to-analog converter for summing the analog input signal and the analog feedback signal to a first integrator of the N integrators;
a second adder coupled to an input terminal of a Kth integrator of the N integrators, wherein an output terminal of the Kth integrator is coupled to an input terminal of a (K+1)th integrator of the N integrators, and K is a positive integer less than N; and
an optimization zero generation unit coupled between the second adder and an output terminal of the (K+1)th integrator.
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Accused Products
Abstract
A feedforward delta-sigma modulator includes a successive approximation analog-to-digital converter, a digital-to-analog converter, N integrators, a first adder, a second adder, and an optimization zero generation unit, where N is a positive integer. An output terminal of each integrator of the N integrators is coupled to the successive approximation analog-to-digital converter. The digital-to-analog converter is coupled between the first adder and the successive approximation analog-to-digital converter. The first adder is coupled to an input terminal of a first integrator of the N integrator. The second adder is coupled to an input terminal of a Kth integrator of the N integrators, where K is a positive integer. The optimization zero generation unit is coupled between an output terminal of a (K+1)th integrator of the N integrators and the second adder.
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Citations
7 Claims
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1. A feedforward delta-sigma modulator, comprising:
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a successive approximation analog-to-digital converter comprising N+1 input terminals, and an output terminal for outputting a digital signal, wherein an input terminal of the N+1 input terminals is used for receiving an analog input signal, and N is a positive integer; a digital-to-analog converter coupled to the output terminal of the successive approximation analog-to-digital converter for receiving the digital signal, and generating an analog feedback signal accordingly; N integrators, wherein an output terminal of each integrator of the N integrators is coupled to a corresponding input terminal of the N+1 input terminals; a first adder coupled to the digital-to-analog converter for summing the analog input signal and the analog feedback signal to a first integrator of the N integrators; a second adder coupled to an input terminal of a Kth integrator of the N integrators, wherein an output terminal of the Kth integrator is coupled to an input terminal of a (K+1)th integrator of the N integrators, and K is a positive integer less than N; and an optimization zero generation unit coupled between the second adder and an output terminal of the (K+1)th integrator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification