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US 2007/0182609 A1Published application
Binary delta-sigma modulator
OwnerMohammad Sayeh, Azad Siahmakouninventors
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Abstract
A modulator, including an integrator (118), a bistable device (110), an adder (102) and a feedback loop (116) is provided. A method for converting a continuous time signal to a binary signal is also provided.
Claims20
A modulator, comprising:
- an adder configured to add a first nonnegative continuous-time signal and a nonnegative binary output signal to form a first nonnegative intermediate signal,
- a leaky integrator operably coupled to the adder and configured to receive the first nonnegative intermediate signal and generate a second intermediate signal therefrom,
- an inverting bistable device operably coupled to the integrator and configured to receive the second intermediate signal, and generate the nonnegative binary output signal therefrom, and
- a feedback loop coupling the inverting bistable device and the adder to provide the nonnegative binary output signal to the adder.
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A method for converting a continuous time signal to a binary signal, comprising the steps of:
- receiving a nonnegative continuous time signal,
- adding a nonnegative binary signal to the nonnegative continuous time signal to produce a first nonnegative intermediate signal,
- processing the first nonnegative intermediate signal through a leaky integrator to produce a second intermediate signal, and
- processing the second intermediate signal through an inverting bistable device to produce the nonnegative binary signal.
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A modulator comprising:
- an amplifier configured to amplify a continuous-time signal,
- an optical isolator configured to receive a light signal,
- an electro-optic modulator coupled to the optical isolator and the continuous-time signal amplifier, the electro-optic modulator configured to receive the amplified continuous-time signal and modulate the light signal thereby,
- a fiber-optic coupler configured to add the modulated light signal and a feedback signal,
- a leaky integrator configured to generate an integrated signal from output of the first fiber-optic coupler,
- an inverting bistable device configured to generate a binary signal from the integrated signal, and
- a second optical coupler coupled to the inverting bistable device configured to provide a binary output signal and the feedback signal.
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Dependencies are inferred from the claim text.