34 results about "Analog delay line" patented technology

Local oscillator circuitry for an antenna array is disclosed. The circuitry includes an array of rotary traveling wave oscillators which are arranged in a pattern over an area and coupled so as to make them coherent. This provides for a set of phase synchronous local oscillators distributed over a large area. The array also includes a plurality of phase shifters each of which is connected to one of the rotary oscillators to provide a phase shifted local oscillator for the array. The phase shifter optionally includes a cycle counter that is configured to count cycles of the rotary oscillator to which it is connected and control circuitry that is then operative to provide a shifted rotary oscillator output based on the count from the cycle counter. A system and method for operating a true-time delay phased array antenna system. The system includes a plurality of antenna element circuits for driving or receiving an rf signal from the elements of the array. Each element circuit has a transmit and a receive path and a local multiphase oscillator, such as a rotary traveling wave oscillator. Each path has an analog delay line for providing a true-time delay for the antenna element. Preferably, the analog delay line is a charge coupled device whose control nodes are connected to phases of the local multiphase oscillator to implement a delay that is an integer number local multiphase oscillator periods. A fractional delay is also included in the path by using a sample and hold circuit connected to a particular phase of the oscillator. By delaying each antenna element by a true time delay, broadband operation of the array is possible.

The disclosure is directed toward improved methods and apparatus for producing PSK signals. Commonly, such signals as Differential Quadrature Phase Shift Keying (DQPSK) are produced by coupling the outputs of an encoder to finite impulse response (FIR) filters. The filters shape the path that the signal takes between the transmission of one symbol and the next symbol The present disclosure discloses a method of generating a signal so that the path taken between transmitted symbols is determined by looking up the intermediate values along the path, using a look-up table. An embodiment of the disclosure receives the present symbol and the next symbol to be transmitted and then serially accesses a series of intermediate points comprising a preferred signal path between the present symbol and the next symbol to be transmitted. Commonly some PSK signals are transmitted by processing the phase and the amplitude of the signal separately. In those applications it is common to delay the amplitude portion of the signal in an analog delay line in order to ensure that the recombined signal will have the proper relationship of phase and amplitude. One preferred embodiment adds a phase offset to the phase signal instead of adding a delay to the amplitude signal. Another preferred embodiment performs phase amplitude synchronization by introducing phase offsets in the look-up table values which represent the signal path between sequentially transmitted signals. The phase offset achieves the same result as the traditional amplitude delay mechanism in synchronizing the phase and amplitude portions of the signal without the traditional delay line hardware.

A method equalizes a received signal in an optical communications system. The received signal is passed through an analog delay line where it is tapped to generate a set of delayed copies of the received signal. In a set of analog multipliers, each delayed copy of the received signal is multiplied by a corresponding weight to generate a set of weighted signals that are then summed to produce an output signal. The output signal is thresholded and subtracted from the output signal to produce an error signal, which is periodically sampled. In a digital weight updating circuit, the weights are produced from digitized versions of the sampled error signal and samples of the delayed copies of the received signal.

An analog delay locked loop device includes a first block for receiving an internal clock signal and a reference clock signal to generate normal multi phase clock signal pairs and dummy multi phase clock signal pairs; and a second block for receiving the reference clock signal to generate a delay locked internal clock signal having a corrected duty cycle based on the normal multi phase clock signal pairs and the dummy multi phase clock signal pairs.

A synchronous mirror delay (300) includes a ring oscillator that generates a plurality of tap clock signals (T1-T7) with one tap clock signal being designated an oscillator clock signal. In response to an input clock signal, a model delay line generates a model delayed clock signal having a model delay relative to the input clock signal. A coarse delay circuit generates a coarse delay count (316) responsive to the oscillator, input, and model delayed clock signals, and activates a coarse delay enable signal responsive to the delay count being equal to a reference count value. A fine delay circuit latches the tap clock signals and develops a fine delay from the latched signals, and activates a fine delay enable signal having the fine delay in response to the coarse delay enable signal. An output circuit generates a delayed clock signal responsive to the coarse and fine delay enable signals going active.

An A/D converter circuit uses first and second ring delay lines. The first and second ring delay lines are supplied with input signals, which increase/decrease oppositely from each other with respect to change directions. In each ring delay line, a first counter counts the number of times of circulation of a pulse signal circulating therein to find a digital data, and a last digital data is subtracted from a present digital data. By adding the resulting first and second digital data of the first and second ring delay lines, a digital data of the input voltage of linear characteristics is provided.

The invention relates to a compressive sampling based ultra wideband (IR-UWB) signal detection method, which comprises an IR-UWB signal compressive sampling receiving system, and the IR-UWB signal compressive sampling receiving system comprises a multi-channel parallel sampling unit for carrying out sampling on a plurality of channels of the IR-UWB signals, a measuring waveform generator for respectively sending measuring waveforms to the channels of the multi-channel sampling unit, and a digital back-end processing component for receiving the measuring values of the channels sampled by the multi-channel sampling unit; and the channels carry out linear projection on the IR-UWB signals respectively according to the measuring waveforms generated by the measuring waveform generator. The method comprises the following steps: obtaining a compressive sampling sequence of pilot-symbol receiving signals, obtaining a compressive sampling sequence of data-symbol receiving signals, and obtaining a symbol decision. The compressive sampling based IR-UWB (ultra wideband) signal detection method can realize the low-sampling-rate and low-hardware-cost on the detection of the IR-UWB signals without high sampling rate, analog delay line and compressive sampling receiving mode with accurate channel estimation.

Techniques for calibrating interleaved analog-to-digital converter (ADC) arrays are presented. A transceiver comprises an ADC component comprising an array of interleaved sub-ADCs, and an auxiliary path associated with an auxiliary sub-ADC used to facilitate calibrating a sampling array by comparing the auxiliary path signal to signals of the sub-ADCs in the array. A calibration component employsa phase-interpolator and analog delay lines to adjust the auxiliary sub-ADC to enable the auxiliary sub-ADC to be lined up to any one of the sampling instants of the sampling array. The calibration component compares the auxiliary signal to sub-ADC signals, determines path differences between the sub-ADC paths based on the comparison results, and calibrates the sub-ADCs and sub-ADC paths to reducethe path differences to mitigate distortion in a digital stream produced from combining the digital substreams produced by the sub-ADCs in the array.

The invention provides a delay locking ring and a delay locking method. The delay locking ring comprises the following steps: delaying an analog main delay line of a reference clock signal based on amain delay control word; enabling the digital phase discrimination module identify the phase difference before and after the reference clock signal delay; the digital main control module is used for adjusting the main delay control word based on the phase difference and assigning the main delay control word corresponding to the delay period to the set delay control word; the digital slave controlmodule takes a set delay control word with a set proportion as a slave delay control word; an analog slave delay line that delays an input clock signal is controlled based on the slave delay control word. Controlling the reference clock signal to be delayed for a period based on the phase-locked loop; assigning the corresponding main delay control word to a set delay control word, multiplying themain delay control word by a set proportion, and adjusting the delay of the input clock signal. According to the invention, the digital phase discriminator and the digital controller are adopted, thereliability is high, and a loop is more stable; and an analog delay line is adopted, so that delay adjustability can be realized, and the circuit debugging difficulty is reduced.

The invention discloses an analog delay line receiver and an implementation method thereof. The analog delay line receiver comprises a microwave assembly and a digital assembly, wherein the microwaveassembly comprises a low-noise amplifier component, a 2-18GHz filter component, a 10dB amplifier component, a two-power divider component, a DLVA detector component, a limiter component, a four-powerdivider component, a radio frequency delayer component, a mixer component and a low-pass filter component; the digital assembly comprises a power supply part, an NOR FLASH part, an ADC part and an FPGA part. The power supply part is divided into an analog power supply module and a digital power supply module; the NOR FLASH component is connected with the power supply component and the FPGA component; the ADC part is connected with the power supply assembly and the FPGA part; and the FPGA component is connected with the ADC component and the power supply component. According to the invention, the sensitivity of the width-preserving detection VP is further optimized, the dynamic range of the input signal is increased, better quantization precision is provided for digital channelization, andthe difficulty of digital channelization in false detection of the pulse-to-pulse noise of the saturated intermediate frequency signal is solved.

The present invention aims to provide a delay device having an analog delay line adaptable to a plurality of frequencies with a less number of taps. The analog delay line has a maximum delay amount equivalent to a wavelength from over a ⅜ wavelength of a predetermined maximum wavelength of an input signal to under a 1 wavelength thereof. Tap intervals up to a delay point equivalent to ½ of a predetermined minimum wavelength of the input signal are different from tap intervals placed ahead of those. The maximum wavelength is a wavelength of a signal having a frequency of 2 MHz, for example, and the minimum wavelength is a wavelength of a signal having a frequency of 5 MHz, for example.

The invention discloses a transmitting-receiving isolation forwarding interference method and a forwarding interference device based on an analog delay line. The forwarding interference method comprises the following specific steps: receiving and amplifying a radiation source signal to obtain a first signal; performing interval on-off processing on the first signal to obtain a second signal with a preset interval on-off duration; performing delay processing on the second signal through an analog delay line to obtain an interference signal; and amplifying and transmitting the interference signal. According to the invention, fast time-division isolation forwarding is realized through the analog delay line, the system design difficulty and the forwarding interference cost are effectively reduced, and the bandwidth processing range is widened.