Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2001-10-26
2003-02-25
Tran, Toan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S073000
Reexamination Certificate
active
06525573
ABSTRACT:
FIELD OF HE INVENTION
The present invention is related to signal processing, and more specifically to signal processing without the use of a digital signal processor and A/D converter.
BACKGROUND OF THE INVENTION
Generally, signal processing involves the use of a digital signal processor to perform the desired signal processing function. Typically, the following method is used in performing a signal processing function. First, an analog signal is filtered with an anti-alias filter. The analog signal is then converted to a digital signal by means of an ADC (analog to digital converter). Next, a DSP (digital signal processor) is used perform the desired signal processing function on the digital signal. The digital signal is then converted back to an analog signal by means of a DAC (digital to analog converter). Finally, the signal is filtered with a low pass filter.
The signal processing system described above requires many complex components taking up resources on the circuit. For example, extra power supplies may be needed to provide power to the DSP (digital signal processor), ADC, or other components. Additionally, the available die area on the chip is reduced by each extra component placed on it. For example, the DSP takes up valuable resources on the circuit. Even simple signal processing functions may require many extra components taking up valuable resources.
SUMMARY OF THE INVENTION
The present invention is directed at performing signal processing function without the use of a digital signal processor and ADC. The signal processing architecture described herein may be used to perform many different signal processing functions. For example, the invention is directed at performing signal processing functions, including validating a code or signal if stable for a predetermined number of clock cycles, peak detection, peak suppression, and the like. The invention is also directed at implementing such functions with minimal complexity and a minimal die area.
According to one aspect of the invention, no A/D converter circuitry is needed. Instead, a reference signal, which according to one embodiment of the invention relates to a DAC output signal, is used as a starting point and is adjusted to produce the desired signal processing function. Comparisons are made between the reference signal and an input signal. The reference signal is adjusted to obtain the desired signal processing function. The reference signal is then converted by a DAC (digital to analog conversion) circuit to obtain an address depending on the signal processing function applied to the incoming signal.
According to another aspect of the invention, an algorithm implements a signal processing function based on the history of the last n comparisons between the reference signal and the incoming signal, where n is a predetermined number greater than zero. The algorithm may also generate feedback that modifies the reference signal.
According to another aspect of the invention, an apparatus for signal processing comprises a controlled reference circuit that produces a reference signal corresponding to a code. The apparatus also comprises a decision level processing circuit that is arranged to make a comparison between the reference signal and an input signal. The decision level processing circuit is configured to produce a desired signal processing function in response to the comparison.
According to another aspect of the invention, a method for signal processing using the novel signal processing architecture is provided. The method includes making a comparison between a reference code relating to a code and another signal, applying a signal processing function to the signal, and producing an output signal in response to the comparison and the signal processing function.
According to yet another aspect of the invention, an apparatus for a signal processing architecture comprises a means for signal processing without the use of a DSP and ADC. The apparatus produces a reference signal in response to a DAC signal and makes a comparison between the reference signal and an analog signal. A means for signal processing is applied and a signal is produced in response to the comparison and the signal processing function.
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“Introduction to Data Conversion and Processing”, Data Conversion System Design by Behzad Ravavi, IEEE Press ISBN 0-7803-1093-4, pp. 1-5.
Page 9 of NSC ‘Application Note 4’ from 1991 NSC Linear Applications Handbook.
Merchant & Gould P,C,
National Semiconductor Corporation
Sullivan Timothy P.
Tran Toan
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