Method and apparatus for generation of test bitstreams and testing of closed loop transducers
First Claim
1. A method for generating a test bitstream for testing a closed loop transducer which includes a sensor and an Analog-to-Digital converter (ADC) having a Σ
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bitstream which is fed back to said sensor, comprising the steps ofgenerating a pattern bitstream andrepeating said test pattern bitstream to form said test bitstream.
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Abstract
A high performance method and apparatus for testing a closed loop transducer is disclosed. A test bitstream signal is combined with a ΣΔ feedback bitstream of the transducer to produce a combined bitstream which is converted to a physical feedback to the sensor of the transducer. The ΣΔ bitstream output of the transducer is recorded for later analysis so as to test characteristics of the transducer. The test bitstream signal is preferably an oversampled, pulse density modulated signal. A testing arrangement is provided which is based upon the storage of short-length test patterns which are repetitively accessed to form a continuous test pattern. The test bitstream provided by the method of the invention produces very low noise and low distortion test signals where a repetitive test pattern is equivalent in length to one period of the test signal.
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Citations
3 Claims
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1. A method for generating a test bitstream for testing a closed loop transducer which includes a sensor and an Analog-to-Digital converter (ADC) having a Σ
- Δ
bitstream which is fed back to said sensor, comprising the steps ofgenerating a pattern bitstream and repeating said test pattern bitstream to form said test bitstream. - View Dependent Claims (2, 3)
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Specification