High-speed parallel D/A clock synchronization apparatus

Abstract

The invention discloses a high-speed parallel D / A clock synchronization apparatus. The high-speed parallel D / A clock synchronization apparatus comprises a signal conditioning unit for adjusting the amplitude size of clock signals, increasing the amplitude of the clock signals to a saturation degree of an amplification unit before a switch unit is energized and then reducing the amplitude after a state is stable so as to enable the amplification unit to work at a linear interval, and the switch unit and the amplification unit. The invention further discloses a high-speed parallel D / A clock synchronization method. According to the apparatus and method provided by the invention, synchronization of a multichannel signal generation system can only be concentrated on on-off of a radio frequency switch, the transition time at the moment when the switch is turned on and turned off is substantially compressed, the influences of errors caused by clock jittering at D / A conversion initial time, and the stability and the reliability are good. On the other hand, by use of the feature of small noise of a radio frequency circuit, low-noise conversion of high-speed clock signals from a single end to a differential is finished, and the application requirement of circuit difference signals can be met.

Description

technical field [0001] The invention relates to the field of signal generation, in particular to a high-speed parallel D / A clock synchronization device and a synchronization method. Background technique [0002] The high-resolution capability and anti-jamming capability of the radar are closely related to the bandwidth of the radar signal. For example, in order to improve the ranging accuracy and distance resolution, and to image and identify the target, the signal transmitted by the radar is required to have a large bandwidth and time-width product—— A broadband FM signal is added to the wide pulse to expand the signal frequency band and improve the overall performance of the radar. This involves the generation technology of the large bandwidth signal. [0003] At present, linear frequency modulation signal (LFM) is the most widely used signal in most broadband radar systems. With the maturity of digital technology and the rapid development of VLSI technology, direct digit...

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Problems solved by technology

However, the existing method is applicable when the D / A conversion rate is low. Once high-speed D / A is involved, the signal clock frequency in a synthetic aperture radar (SAR) is above 2GHz. At this time, the circuit is very sensitive to signal jitter. Errors at the ps level each time power-on or reset may cause out-of-sync between channels. Fix sync issues

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