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US 7,058,548 B2Granted
High bandwidth real-time oscilloscope
AssigneeLeCroy Corporation
InventorsPeter J. Pupalaikis, David C. Graef
Life of this patent
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Abstract
A method and apparatus for digitizing a data signal. An input analog data signal, is received and split into a plurality of split signals. At least one of the split signals is mixed with a predetermined periodic function with a predetermined frequency. The split signals are then digitized and combined mathematically to form a single output data stream that is a substantially correct representation of the original input signal.
Claims28
A method for digitizing a data signal, comprising the steps of:
- receiving an input analog data signal spanning a frequency range;
- splitting the received input analog data signal into a plurality of split signals, each spanning a frequency range smaller than the original frequency range;
- mixing at least one of said split signals with a predetermined periodic function with a predetermined frequency, thereby translating the frequency range of the at least one split signal;
- digitizing each of said split signals;
- converting the frequency range of the at least one split signal back to its original frequency range;
- and
- combining said digitized split signals mathematically to form a single output data stream that is a substantially correct representation of the received input signal over the original frequency range.
4 more elements
A method for digitizing a data signal, comprising the steps of:
- receiving an input analog data signal;
- splitting the received input analog data signal into channels having a low frequency split signal and a high frequency split signal respectively;
- mixing at least one of said low frequency and said high frequency split signals with a predetermined periodic function with a predetermined frequency;
- digitizing said split signals;
- band limiting each of the split signals to a predetermined band range;
- upsampling each digitized split signal to a predetermined sample rate;
- mixing said at least one of said low frequency and said high frequency split signals with a predetermined periodic function with said predetermined frequency, resulting in two images of said at least one split signal;
- passing said at least one of said high frequency and said low frequency split signals through an image reject filter, having a second predetermined frequency, to remove an unwanted one of the two images;
- and
- combining said digitized split signals mathematically to form a single output data stream that is a substantially correct representation of the received input signal.
7 more elements
An apparatus for digitizing a data signal, comprising:
- an input for receiving an input analog data signal spanning a frequency range;
- a splitter for splitting the received input analog data signal into a plurality of split signals, each spanning a frequency range smaller than the original frequency range;
- a mixer for mixing at least one of said split signals with a predetermined periodic function with a predetermined frequency, thereby translating the frequency range of the at least one split signal;
- a digitizer for digitizing each of said split signals;
- a converter for converting the frequency range of the at least one split signal back to its original frequency range;
- and
- a combining unit for combining said digitized split signals mathematically to form a single output data stream that is a substantially correct representation of the original input signal over the original frequency range.
4 more elements
An apparatus for digitizing a data signal, comprising:
- an input for receiving an input analog data signal;
- a splitter for splitting the received input analog data signal into channels having a low frequency split signal and a high frequency split signal respectively;
- a first mixer for mixing at least one of said high frequency and said low frequency split signals with a predetermined periodic function with a predetermined frequency;
- a digitizer for digitizing said split signals;
- a band limiter for band limiting each of the split signals to a predetermined band range;
- an upsampler for upsampling each digitized split signal to a predetermined sample rate;
- a second mixer for mixing said at least one of said high frequency and said low frequency split signals with a predetermined periodic function with said predetermined frequency, resulting in two images of said at least one split signal;
- an image reject filter, having a second predetermined frequency for receiving and passing said at least one of said high frequency and said low frequency split signals to remove an unwanted one of the two images;
- and
- a combining unit for combining said digitized split signals mathematically to form a single output data stream that is a substantially correct representation of the received input signal.
7 more elements
Dependencies are inferred from the claim text.