An op-amp, defined as a general-purpose, DC-coupled, high gain, inverting feedback amplifier, is first found in US Patent 2,401,779 "Summing Amplifier" filed by Karl D. Swartzel Jr. of Bell labs in 1941. This design used three vacuum tubes to achieve a gain of 90dB and operated on voltage rails of ±350V. ###################################################### It had a single inverting input rather than differential inverting and non-inverting inputs, as are common in today's op-amps. Throughout World War II, Swartzel's design proved its value by being liberally used in the M9 artillery director designed at Bell Labs. ######################################################################### This artillery director worked with the SCR584 radar system to achieve extraordinary hit rates (near 90%) that ####################################################################### would not have been possible otherwise.[3] ###########################
Опытно-конструкторская работа №10 по созданию ультрабыстродействующего модуля аналого-цифрового преобразователя с большим динамическим диапазоном.
# Краткая характеристика:
Разработка внешнего модуля аналого-цифрового преобразователя DSP160x1-1220 с максимальной частотой дискретизации до 2ГГц и с разрешением АЦП 12 бит. Данный модуль позволит обеспечить мгновенный реальный динамический диапазон SFDR 63-65 дБ (1778 раз) в одновременной частотной полосе до 1000 МГц. Предварительная быстродействующая цифровая обработка сигнала (ЦОС), реализованная на ПЛИС типа XC4VLX160 или XC5V позволит обеспечить входную скорость данных в реальном масштабе времени. Возможность дополнительной обработки сигнала с помощью встроенного сигнального процессора типа TMS320C6415 (опционально). Габариты модуля 190х260х60, принудительная вентиляция, компьютерный интерфейс USB2.0.
# Основные задачи решаемые создаваемым оборудованием:
* Построение панорамных мониторинговых систем широкополосных сигналов. * Построение радиотехнических систем с ПЧ до 1750 МГц и полосой одновременной обработки до 500 МГц. * Многоканальные измерения и регистрация высокочастотных сигналов. * Регистрация и обработка сигналов в реальном времени в большом динамическом диапазоне. * Регистрация сигнала с высокой скоростью нарастания амплитуды по 1700 каналам.
# Экономические показатели:
* Срок реализации проекта 11 месяцев * Планируемая рыночная стоимость OEM модуля - 1 299 000 рублей c 18% НДС * Необходимый объем финансирования 19.5 млн. рублей
Первые результаты ОКР №10
Появились первые результаты выполнения ОКР №10 разработки и создании ультрабыстродействующего модуля АЦП.
Назначение. (Предварительные данные)
Внешний модуль быстродействующего АЦП DSP55x1-1220 предназначен для работы с широкополосными сигналами. Уникальное сочетание одновременно широкой обрабатываемой полосы до 1ГГц и высокого разрешения АЦП 12 бит позволяет данному модулю работать в качестве спектроанализатора и осуществлять режим панорамного мониторинга.
Отличительные характеристики:
* Максимальная частота дискретизации до 2.5 ГГц; * Разрешение АЦП - 12 бит; * SFDR 80 дБ(FS).
Отправлено: 29.10.10 11:40. Заголовок: ГЛАВА 3 АНАЛОГО-ЦИФР..
ГЛАВА 2 ДИСКРЕТНЫЕ СИСТЕМЫ Дискретизация аналоговых сигналов по времени Статические передаточные функции АЦП и ЦАП и погрешности по постоянному току Погрешности по переменному току в тракте преобразователя данных Динамические характеристики ЦАП 1
Отправлено: 30.10.10 17:18. Заголовок: This is a real-life ..
This is a real-life example of the signal processing involved with a typical monopulse radar application. As shown in Figure 3, the system uses a multi-element antenna where the received signals consist of three types: Azimuth, Elevation and the sum of these two. The signals to be digitized and processed are as follows:
Azimuth difference or ΔA which is equal to A1 – A2 Elevation difference or ΔE which is equal to E1 – E2 Sum Channel Σ which is equal to the sum of A1 + A2 + E1 + E2 The phase shift between Σ and ΔE determines the elevation of the target The phase shift between Σ and ΔA determines the azimuth of the target The IF center frequency of these signals is 140 MHz and the IF bandwidth is 40 MHz This signal processing requires three channels of A/D converters
Let’s assume that we want to track aircraft targets between a distance of 15 km and 45 km from the radar location. Radar signals travel at the speed of light which is equal to 300,000 km/sec.
For targets at 15 km, the round trip for the radar pulse takes 2 x 15 km ÷ 300,000 km/sec = 100 μsec. For targets at 45 km, the round trip takes 2 x 45 ÷ 300,000 km/sec = 300 μsec. Figure 4 shows the timing required to collect the data. Generate a 50 μsec pulse at T0; start collecting data at T = T0 + 100 μsec; stop collecting data at T = T0 + 300 μsec.
As shown in Figure 9, we chose the complex baseband signal to have 40 MHz bandwidth. When translated to the 140 MHz IF, the 40 MHz signal extends from 120 MHz to 160 MHz. ######################################## The output sampling frequency must be at least twice the 160 MHz highest frequency, or 320 MHz minimum. Let’s choose 400 MHz to be on the safe side, and use the interpolation filter and DUC to translate the baseband to the IF frequency.
Summary The Pentek Model 71621 Transceiver XMC module is a complete radar signal generation, timing and acquisition subsystem. It has the three A/Ds required for monopulse radar and standard on-board support for signal generation and acquisition timing.
Radar data acquisition is facilitated by the 200 MHz, 16-bit A/Ds which capture the 140 MHz IF signals with 40 MHz ########################################################################
140 mgz centr PCH ,40 mgz polosa ot 120 mgz do 160 mgz -----------------------------------------------------------------------
bandwidth. Wideband DDC IP cores convert the IF signals down to baseband. The A/D input controller engine uses a simple parameter table that creates programmable delays, acquisition record lengths and complex acquisition scenarios.
Radar waveform generation uses a D/A controller engine with a simple parameter table. It creates multiple waveforms with programmable delays and lengths. The wideband DUC upconverts the digital baseband waveform to 140 MHz IF and the 400 MHz, 16-bit D/A delivers 140 MHz IF signal with 40 MHz bandwidth.
Отправлено: 30.10.10 17:57. Заголовок: In the words of a us..
In the words of a user, Robert Sgandurra, Senior Product Manager with modular DSP and SDR developer Pentek (www.pentek.com), “TI continues to push the performance envelope with high-speed ADCs. The ADS5485 was a clear choice for our model 7150 Quad A/D Software Radio Module. The higher sample rate means that users will be able to directly digitize nearly 100 MHz of bandwidth, which is invaluable for our customers working on wideband radar and wideband communication systems.”
Отправлено: 30.10.10 21:19. Заголовок: DAnnie po dinamiches..
DAnnie po dinamicheskomu diapazonu woennogo radara USA
The AN/TPS-75 Radar System [ "Tipsy 75"] is a mobile, tactical radar system capable of providing radar azimuth, range, height, and Identification Friend or Foe (IFF) information for a 240-nautical-mile area. This deployable/transportable radar system is capable of providing long range radar data to support operations and control of tactical aircraft. The TPS-75 today forms the backbone of the US Air Force Air Defense system. The AN/TPS-75 Radar system provides a "real-time" radar airspace picture and data in support of the battle commander and the Ground Theater Air Control System (GTACS) via radio, telephone, microwave relay, or satellite communications link. The AN/TPS-75 radar system includes the UPX-27 IFF/SIF equipment, Tactical Air Operation Interface Gp OA 9194/TYQ-23(V)2, Modular Control Equipment Interface Group (MIG) and AN/TLQ-32 ARM Decoy. The AN/TPS-75 is a mobile ground radar set designed to conduct long-range search and altitude-finding operations simultaneously
Weight shelter - app. 8,400 pounds antenna - app. 7,400 pounds Pulse Repetition Frequency (PRF) 235, 250, 275 +/- 0.5 Hz fixed, and two selectable average PRFs; 250 and 275 staggered. For each staggered selection, the transmitter operates sequentially on one of seven PRFs. Transmitter Characteristics peak power - 2.8 MW nominal verage power - 4.7 kW nominal pulse width - 6.8 +/- 0.25 microseconds
Receiver Characteristics type -seven logarithmic channels sensitivity - negative 105 dB mds dynamic range - 70 dB search, 70 dB height intermediate frequency - 32 MHz 3-D Coverage (Search, Height and Range) azimuth - 360 degrees (operator controlled blanking optional) elevation angles - 0.5 to 20 degrees above the radar horizon maximum altitude - 95,500 feet range - one to 240 nautical miles scanning rate - approximately 6.5 rpm
dimensions 11 feet high by 18 feet 4 inches wide polarization vertical beam width - 1.1 degrees horizontal and 1.55 degrees to 8.1 degrees with a total of 20 degrees (6 stacked beams)
------------
dynamic range - 70 dB search, 70 dB height
dinamicheskij diapazon sowremennix 16 bit ADC wische ... ************************************************* + NLEQ /nelinejnij equaliser iz Lincoln laboratory 12-24 db ...
Отправлено: 31.10.10 19:49. Заголовок: Dannie 16 bit ADC ..
Dannie 16 bit ADC k 140 mgz centr PCH ,40 mgz polosa ot 120 mgz do 160 mgz -----------------------------------------------------------------------
ADS5485 TI 200 msps AD9467 250 msps SNR 130 mgz -74.8 db n/d 140 mgz - n/d 74.4/76 db 170 mgz -74.8 db 74.3db/75.8db SFDR 130 mgz -85 db n/d 140 mgz -n/d 94/95 db 170 mgz -78 db 93/92 db SINAD 130 mgz -72.9db n/d 140 mgz n/d 74.4/76 db 170 mgz -71.7 db 74.2db/75.8db Price -125$ AD9467 po dinamicheskomu diapazonu lutsche - dlja primera pentek 92 db + wiigrisch ot NLEQ Lincoln laboratory 12 db = 104 db
Xoroscho --------
----------------------------------------- Summary The Pentek Model 71621 Transceiver XMC module is a complete radar signal generation, timing and acquisition subsystem. It has the three A/Ds required for monopulse radar and standard on-board support for signal generation and acquisition timing.
Radar data acquisition is facilitated by the 200 MHz, 16-bit A/Ds which capture the 140 MHz IF signals with 40 MHz ########################################################################
140 mgz centr PCH ,40 mgz polosa ot 120 mgz do 160 mgz -----------------------------------------------------------------------
bandwidth. Wideband DDC IP cores convert the IF signals down to baseband. The A/D input controller engine uses a simple parameter table that creates programmable delays, acquisition record lengths and complex acquisition scenarios.
Radar waveform generation uses a D/A controller engine with a simple parameter table. It creates multiple waveforms with programmable delays and lengths. The wideband DUC upconverts the digital baseband waveform to 140 MHz IF and the 400 MHz, 16-bit D/A delivers 140 MHz IF signal with 40 MHz bandwidth.
Отправлено: 31.10.10 20:21. Заголовок: THEORY OF OPERATION ..
THEORY OF OPERATION The AD9467 architecture consists of an input-buffered pipe-lined ADC that consists of a 3-bit first stage, a 4-bit second stage, followed by four 3-bit stages and a final 3-bit flash. Each stage provides sufficient overlap to correct for flash errors in the preceding stage. The input buffer provides a linear high input impedance (for ease of drive) and reduces the kick-back from the ADC. The buffer is optimized for high linearity, low noise, and low power. The quantized outputs from each stage are combined into a final 16-bit result in the digital correction logic. The pipelined architecture permits the first stage to operate with a new input sample while the remaining stages operate with preceding samples. Sampling occurs on the rising edge of the clock. Each stage of the pipeline, excluding the last, consists of a low resolution flash ADC connected to a switched-capacitor DAC and an interstage residue amplifier (for example, a multiplying digital-to-analog converter (MDAC)). The residue amplifier magnifies the difference between the reconstructed DAC output and the flash input for the next stage in the pipeline. One bit of redundancy is used in each stage to facilitate digital correction of flash errors. The last stage simply consists of a flash ADC. The output staging block aligns the data, corrects errors, and passes the data to the output buffers.
Отправлено: 01.11.10 14:15. Заголовок: The V-Corp proprieta..
The V-Corp proprietary LinComp approach requires less hardware than phase-plane compensation and provides up to 24 dB or more reduction in harmonic distortion, does not require slope estimates, and is capable of super-Nyquist error compensation (i.e., direct synthesis of high IF data).
Отправлено: 01.11.10 16:04. Заголовок: A 5 Gsps 8-10 bit AD..
A 5 Gsps 8-10 bit ADC Platform Concept for RF and Instrumentation Applications François BORE, e2v, avenue de Rochepleine, BP123, 38521 Saint-Egrève Cedex, France www.e2v.com
Все даты в формате GMT
3 час. Хитов сегодня: 20
Права: смайлы да, картинки да, шрифты нет, голосования нет
аватары да, автозамена ссылок вкл, премодерация откл, правка нет
- участник сейчас на форуме
- участник вне форума