Low frequency noise source and method of calibration thereof
OwnerDavid Stocktoninventor
Life of this patent
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Abstract
A low frequency noise source includes a digital section having a controller, a low frequency noise generator coupled to the controller, a calibration waveform generator coupled to the controller, and a switch coupled to outputs of the noise generator and the calibration waveform generator for selectively coupling one of them to a Digital to Analog Converter (DAC) having an output coupled to an analog output interface. The low frequency noise source is controlled by a noise figure measuring instrument and an ac power meter is used to measure the output of the low frequency noise source so that it can be calibrated prior to be using used for measuring noise figures for devices to be tested.
Claims13
A low frequency noise source, comprising:
- a control input for receiving control signals;
- a digital section comprising
- a controller, having a bi-directional control interface coupled to the control input,
- a low frequency noise generator coupled to the controller and having an output,
- a calibration waveform generator coupled to the controller and having an output,
- a switch coupled to the outputs of the noise generator and the calibration waveform generator for selectively coupling one of the outputs of the noise generator and the calibration waveform generator to an output of the digital section;
- a Digital to Analog Converter (DAC) having an input coupled to the output of the digital section and an output;
- and
- an analog output interface having an input coupled to the output of the DAC and an output coupled to an output of the low frequency noise source.
Dependencies are inferred from the claim text.