Topic
Digital signal
About: Digital signal is a research topic. Over the lifetime, 44213 publications have been published within this topic receiving 345279 citations.
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TL;DR: A thermal absolute pressure sensor of the heated microbridge type has been integrated with an active bias circuit and an 8-b successive approximation register analog/digital (A/D) converter as discussed by the authors.
Abstract: A thermal absolute pressure sensor of the heated microbridge type has been integrated with an active bias circuit and an 8-b successive approximation register analog/digital (A/D) converter. The chip, which contains about 1000 devices, is sensitive to variations in absolute gas pressure between 10 and 10/sup 4/ Pa, and it is implemented in a 4-Um NMOS technology merged with the microsensor process. The output of the chip is a robust digital signal adequate for transmission in high noise environments. >
117 citations
Patent•
24 Jan 1991
TL;DR: In this paper, the first pulse is provided to and circulated in a ring signal delay circuit having a plurality of signal delay elements that are connected in series, intermediate points between the delay elements provide delayed pulses having different delay times.
Abstract: A pulse phase difference encoding circuit provides a digital signal indicating a phase difference between a first input pulse and a second input pulse. The first input pulse is provided to and circulated in a ring signal delay circuit having a plurality of signal delay elements that are connected in series. Intermediate points between the delay elements provide delayed pulses having different delay times. Upon receiving the second input pulse, a selector selects one delay pulse provided by the delay element at which the first input pulse has arrived, and generates a digital positional signal indicating a position of the selected delay element. The number of rounds of circulation of the first input pulse in the ring signal delay circuit is separately counted. According to the number of rounds of circulation of the first pulse and the positional signal, the digital signal indicating the phase difference between the first and second input pulses is formed.
116 citations
Patent•
01 May 2006TL;DR: In this paper, an analog to digital converters are formed into a two-dimensional array and the array may incorporate digital signal processing functionality, such an array is particularly well-suited for operation as a readout integrated circuit and, in combination with a sensor array, forms a digital focal plane array.
Abstract: Autonomously operating analog to digital converters are formed into a two dimensional array. The array may incorporate digital signal processing functionality. Such an array is particularly well-suited for operation as a readout integrated circuit and, in combination with a sensor array, forms a digital focal plane array.
116 citations
Patent•
18 Jun 1990
TL;DR: In this paper, an improved locator system is presented which transmits digital and analog information over an electromagnetic field that is radiating from an underground source, including a receiver that senses and detects the transmitted digital or analog signal impressed on the radiated electromagnetic field.
Abstract: An improved locator system is provided which transmits digital and analog information over an electromagnetic field that is radiating from an underground source. The locator system includes a transmitter that modulates its output signal by turning its output signal on and off in response to a sequence of digital words. The transmitter also modulates an analog signal onto the transmitted signal. The modulated analog signal can include an audio frequency or voice signal. The improved locator system also includes a receiver that senses and detects the transmitted digital or analog signal impressed on the radiated electromagnetic field. The receiver also demodulates the transmitted audio frequency signal and provides an audio output signal to an operator.
116 citations