Differential cross coupled peak detector
AssigneeDallas Semiconductor Corporation
InventorMichael D. Smith
Life of this patent
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Abstract
The present invention overcomes the aforementioned shortcomings and deficiencies of the prior art by providing a circuit for processing an AC signal having a peak to peak envelope associated therewith, this circuit including structure for detecting the upper edge of the peak to peak envelope of the AC signal, structure for detecting the lower edge of the peak to peak envelope of the AC signal, structure for sampling the AC signal at a mid range upper point, and structure for sampling the AC signal at a mid range lower point.
Claims16
A circuit for processing an AC signal having a peak to peak envelope associated therewith, the envelope having an upper edge, a lower edge and an intermediate edge therebetween, said circuit comprising:
- means for detecting the upper edge of the peak to peak envelope of the AC signal, said means for detecting the upper edge including a first comparator, a second comparator, and a NOR gate having two inputs, each of said two inputs of said NOR gate being connected to one of said first and second comparators;
- means for detecting the lower edge of the peak to peak envelope of the AC signal;
- means coupled to said means for detecting the upper edge for detecting the AC signal at a mid range upper point, said mid range upper point occurring between the intermediate edge and the upper edge of the peak to peak envelope, including a first output;
- and
- means coupled to said means for detecting the lower edge for detecting the AC signal at a mid range lower point, said mid range lower point occurring between the intermediate edge and the lower edge of the peak to peak envelope, including a second output.
A circuit for processing an AC signal having a peak to peak envelope associated therewith, the envelope having an upper edge, a lower edge and an intermediate edge therebetween, said circuit comprising:
- means for detecting said upper edge of peak to peak envelope of the AC signal;
- means for detecting said lower edge of said peak to peak envelope of the AC signal, said means for detecting said lower edge comprises a first and a second comparator, and an OR gate having two inverted inputs, each of which two inverted inputs is connected to one of said first and second comparators;
- means coupled to said means for detecting the upper edge for detecting the AC signal at a mid range upper point, said mid range upper point occurring between the intermediate edge and the upper edge of the peak to peak envelope, including a first output;
- and
- means coupled to said means for detecting the lower edge for sampling the AC signal at a mid range lower point, said mid range lower point occurring between the intermediate edge and the lower edge of the peak to peak envelope, including a second output.
A circuit for processing an AC signal having a peak to peak envelope associated therewith, said envelope having an upper edge, a lower edge and an intermediate edge therebetween, said circuit comprising:
- a first detector for detecting the upper edge of the peak to peak envelope of the AC signal, said means for detecting the upper edge including a first comparator, a second comparator, and a NOR gate having two inputs, each of said two inputs of said NOR gate being connected to one of said first and second comparators;
- second detector for detecting the lower edge of the peak to peak envelope of the AC signal;
- third detector coupled to said first detector for detecting the AC signal at a mid range upper point, said mid range upper point occurring between the intermediate edge and the upper edge of the peak to peak envelope, including a first output;
- and
- fourth detector coupled to said second detector for detecting the AC signal at a mid range lower point, said mid range lower point occurring between the intermediate edge and the lower edge of the peak to peak envelope, including a second output.
Dependencies are inferred from the claim text.