Patent
Transversal frequency filter
TLDR
In this paper, a handpass filter for detecting a chirp signal is provided, which includes the step of selectively varying the clock rate applied to a charge-transfer shift register responsive to the frequency variations of a selected chircp signal.Abstract:
A charge-transfer transversal filter and method of use is provided. In one aspect of the invention a handpass filter is provided where the center frequency of the bandpass is variable responsive to the clock rate applied to the charge-transfer devices. In a different aspect of the invention a matched filter for a chirp signal is provided. The filter requires a minimum number of Nyquist samples by including the provision of a clock rate which varies responsive to the frequency sweep of the input chirp signal. A method for detecting a chirp signal is provided which includes the step of selectively varying the clock rate applied to a charge-transfer shift register responsive to the frequency variations of a selected chirp signal.read more
Citations
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References
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Journal ArticleDOI
Active bandpass filtering with bucket-brigade delay lines
TL;DR: In this article, a tunable active bandpass filter with bucket-brigade delay lines was used to build an active band pass filter, and experimental results showed the dependence of center frequency and bandwidth on the delay-line clock frequency.
Patent
Time domain equalizer using analog shift register
TL;DR: In this article, a transversal equalizing filter was used to replace the conventional tapped delay line of an analogue shift register, 30, and each stage of the shift register comprises first and second storage capacitors CA1 and CA2 having opposite polarity trapezoidal shift pulses applied respectively thereto.
Patent
Periodic frequency characteristic filter for filtering periodic sampled signal
TL;DR: In this paper, a filter has first and second multi-input addition circuits each with a single output where one input of the first addition is the input to the filter and the output of the second addition circuit is the output from the filter.
Patent
Shift register stage using insulated-gate field-effect transistors
TL;DR: In this paper, an insulated-gate field effect transistor (IGFET) shift register stage occupies less semiconductor chip area because a separate ground lead to the gate and drain electrodes of a pair of IGFET load devices is eliminated.