Composable transceiver using low bit count inputs and outputs
AssigneeRaytheon Company
InventorsHarry B. Marr, Daniel Thompson, Ian S. Robinson
Life of this patent
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Abstract
A radio frequency system. In some embodiments, the system includes a one-bit receiver, and the one-bit receiver includes a digital pseudo random noise generator, a one-bit digital to analog converter, a power combiner, a one-bit analog to digital converter, and a digital subtraction circuit. The digital pseudo random noise generator produces a signal added to the received signal before analog to digital conversion. After analog to digital conversion, a delayed version of the dither is subtracted from the digital signal.
Claims20
A radio frequency system, comprising:
- a one-bit receiver, having a radio frequency input and a digital output, and comprising:
- a digital pseudo random noise generator;
- a one-bit digital to analog converter, having an input connected to an output of the digital pseudo random noise generator;
- a power combiner, having a first input connected to an output of the one-bit digital to analog converter and a second input connected to the radio frequency input;
- a one-bit analog to digital converter, having an input operatively coupled to an output of the power combiner;
- and
- a digital subtraction circuit, having a first input connected to an output of the one-bit analog to digital converter, a second input operatively coupled to the output of the digital pseudo random noise generator, and an output connected to the digital output of the one-bit receiver,
- wherein:
- the digital pseudo random noise generator,
- the one-bit digital to analog converter,
- the one-bit analog to digital converter, and
- the digital subtraction circuit
- are implemented in a field programmable gate array, and
- wherein:
- the one-bit analog to digital converter is a serial receiver.
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A radio frequency system, comprising:
- a one-bit receiver, having a radio frequency input and a digital output, and comprising:
- a digital pseudo random noise generator;
- a one-bit digital to analog converter, having an input connected to an output of the digital pseudo random noise generator;
- a power combiner, having a first input connected to an output of the one-bit digital to analog converter and a second input connected to the radio frequency input;
- a one-bit analog to digital converter, having an input operatively coupled to an output of the power combiner;
- and
- a digital subtraction circuit, having a first input connected to an output of the one-bit analog to digital converter, a second input operatively coupled to the output of the digital pseudo random noise generator, and an output connected to the digital output of the one-bit receiver,
- the radio frequency system further comprising:
- a one-bit transmitter having a digital input and an analog output, and comprising
- a digital pseudo random noise generator,
- a first digital adding circuit,
- a digital integrator,
- a second digital adding circuit,
- a digital comparator,
- a one-bit digital to analog converter, and
- a digital gain circuit,
- wherein
- the digital pseudo random noise generator of the one-bit transmitter has an output;
- the first digital adding circuit has:
- a first input, connected to the output of the digital pseudo random noise generator of the one-bit transmitter,
- a second input, and
- an output,
- the digital integrator has:
- an input connected to the output of the first digital adding circuit, and
- an output;
- the second digital adding circuit has:
- a first input, connected to the output of the digital integrator,
- a second input, connected to the digital input of the one-bit transmitter, and
- an output,
- the digital comparator has:
- a first input, connected to the output of the second digital adding circuit,
- a second input, connected to a digital constant, and an output,
- the one-bit digital to analog converter of the one-bit transmitter has:
- an input, connected to the output of the digital comparator, and
- an output, connected to the analog output of the one-bit transmitter;
- and
- the digital gain circuit has:
- an input, connected to the output of the digital comparator,
- an output, connected to the second input of the first digital adding circuit, and
- a low-frequency gain exceeding one.
A radio frequency system, comprising:
- a one-bit receiver, having a radio frequency input and a digital output, and comprising:
- a digital pseudo random noise generator;
- a one-bit digital to analog converter, having an input connected to an output of the digital pseudo random noise generator;
- a power combiner, having a first input connected to an output of the one-bit digital to analog converter and a second input connected to the radio frequency input;
- a one-bit analog to digital converter, having an input operatively coupled to an output of the power combiner;
- and
- a digital subtraction circuit, having a first input connected to an output of the one-bit analog to digital converter, a second input operatively coupled to the output of the digital pseudo random noise generator, and an output connected to the digital output of the one-bit receiver, wherein:
- the first input of the power combiner is connected to the output of the one-bit digital to analog converter through a first switch,
- the second input of the power combiner is connected to the radio frequency input of the one-bit receiver through a second switch,
- the output of the power combiner is connected to the input of the one-bit analog to digital converter through a third switch and an attenuator, and
- the second input of the power combiner is connected to the output of the power combiner through a fourth switch.
Dependencies are inferred from the claim text.