Intermediate frequency digital-to-analog conversion (IFDAC) system
AssigneeShure Acquisition Holdings, Inc.
InventorMichael J. Goodson
Life of this patent
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Abstract
The present disclosure describes a digital-to-analog converter (DAC) comprising a programmable integrated circuit, a resampler, and a clock. The programmable integrated circuit may be configured to perform delta-sigma modulation to convert a digital signal to a coarse representation of an analog signal. The coarse representation of the analog signal may be sent to a first-stage of the resampler. After processing the signal, the first-stage of the resampler may pass a continuous signal to the second-stage of the resampler. The second-stage of the resampler produce a clean sampling instant for the signal that represents the point in time where the signal transitions from discrete time to continuous time. The analog signal may then be outputted to one or more receivers.
Claims20
A digital-to-analog converter comprising:
- a programmable integrated circuit configured to perform delta-sigma modulation on a received digital signal to produce a first continuous signal;
- a two-stage resampler, wherein the two-stage resampler comprises:
- a first-stage of the two-stage resampler configured to smooth the first continuous signal received from the programmable integrated circuit and output a second continuous signal;
- and
- a second-stage of the two-stage resampler configured to perform pulse resampling to smooth the second continuous signal produced by the first-stage resampler and output an analog signal corresponding to the received digital signal.
A system comprising:
- a transmitter comprising a digital-to-analog converter, wherein the digital-to-analog converter comprises:
- a programmable integrated circuit configured to perform delta-sigma modulation on a received digital signal to produce a first continuous signal;
- a two-stage resampler, wherein the two-stage resampler comprises:
- a first-stage of the two-stage resampler configured to smooth the first continuous signal received from the programmable integrated circuit and output a second continuous signal;
- and
- a second-stage of the two-stage resampler configured to perform pulse resampling to smooth the second continuous signal produced by the first-stage resampler and output an analog signal corresponding to the received digital signal;
- and
- a receiver configured to receive the analog signal produced by the transmitter.
A method comprising:
- receiving, by a programmable integrated circuit of a digital-to-analog converter, a digital signal;
- performing, by the programmable integrated circuit, delta-sigma modulation on the digital signal to produce a first continuous signal;
- outputting, by the programmable integrated circuit, the continuous signal to a resampler;
- performing, using a first-stage of the resampler, resampling of the first continuous signal to produce a second continuous signal;
- performing, using a second-stage of the resampler, pulse resampling of the second continuous signal to produce an analog signal of the digital signal received by the programmable integrated circuit;
- and
- outputting the analog signal.
Dependencies are inferred from the claim text.