scholarly journals Development of technology of high-speed digital-to-analogue converters to improve the efficiency of direct digital synthesis of radio-frequency signals

2021 ◽  
Vol 2094 (2) ◽  
pp. 022067
Author(s):  
V V Romashov ◽  
A N Doktorov ◽  
K A Yakimenko ◽  
K K Khramov
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Pulse Sequence ◽  
Bipolar Pulse ◽  
Direct Digital Synthesis ◽  
Coherent Signals ◽  
Modes Of Operation ◽  
Digital Synthesis ◽  
Radio Frequency Signals ◽  
Reconstruction Mode

Abstract The importance of high-speed digital-to-analogue converters for the synthesis of high-frequency coherent signals is shown. A review of the main specialized modes of operation of high-speed digital-to-analogue converters is carried out, which make it possible to effectively use the side components of the spectrum that arose during the restoration of a signal from digital to analogue form. An RF2 reconstruction mode with a modified bipolar pulse sequence is proposed, which makes it possible to increase the amplitude of the images in the eighth and ninth Nyquist zones.

A Method on Realizing Signal Generator for Arbitrary Waveform

2013 ◽  
Vol 333-335 ◽  
pp. 661-665
Author(s):  
Deng Rong Zhou ◽  
Yu Rong Zhou ◽  
Jian Chun Gong ◽  
Da Xing Chen
Keyword(s):  
High Speed ◽  
Synthesis Method ◽  
Sine Wave ◽  
Waveform Generator ◽  
Direct Digital Synthesis ◽  
Waveform Data ◽  
Field Programmable ◽  
Digital Synthesis ◽  
Arbitrary Waveform ◽  
Hardware Circuit

The basic approach of generating arbitrary waveform is the digital synthesis method. Appling this method, one first samples and quantifies a period of the signal waveform to be generized, memorizes the obtained binary waveform data in a memory, and then reads it via hardware circuit in certain sequence, converts the data via digital-to-analog (DA) circuit, finally output the analog waveform through a filter. In this work, an arbitrary waveform generator (AWG) is designed based on the theory of direct digital synthesis (DDS)[1-7]and on the analysis of the performance of the output signal. The design uses a field programmable-gate-array (FPGA)[3]chip to utilize the AWG. The preset and display of the output frequency and phase are controlled by a micro computer unit (MCU). The artribary waveform data can be downloaded and updated from a communication interface. The AWG can produce a high-resolution arbitrary waveform. The dissertation focuses on hardware circuit design, which has been accomplished, including power supply module, MCU system, high-speed DA converter, and filter, etc. The experimental prototype of the AWG has been made and tested systemly.At the end of the dissertation, the measurement result of the system is given and its error is analyzed. It is shown the AWG can output a sine wave, a triangle wave, a sawteeth wave, or a square wave within the frequency range from 0.01Hz to 15MHz with the step of 10mHz, or output an arbitrary waveform within the range from 0.01Hz to 20kHz.

TUNNEL DIODE/TRANSISTOR DIFFERENTIAL COMPARATOR

2004 ◽  
Vol 14 (03) ◽  
pp. 640-645
Author(s):  
QINGMIN LIU ◽  
SURAJIT SUTAR ◽  
ALAN SEABAUGH
Keyword(s):  
Heterojunction Bipolar Transistors ◽  
High Speed ◽  
Bipolar Transistors ◽  
Tunnel Diode ◽  
Direct Digital Synthesis ◽  
Circuit Topology ◽  
Performance Improvements ◽  
Tunneling Diodes ◽  
Double Heterojunction ◽  
Digital Synthesis

A new tunnel diode/transistor circuit topology is reported, which both increases speed and reduces power in differential comparators. This circuit topology is of special interest for use in direct digital synthesis applications. The circuit topology can be extended to provide performance improvements in high speed logic and signal processing applications. The circuits are designed based on InP/GaAsSb double heterojunction bipolar transistors and AlAs/InGaAs/AlAs resonant tunneling diodes. A self-aligned and scalable fabrication approach using nitride sidewalls and chemical mechanical polishing is outlined.

Sign in / Sign up

Export Citation Format

Share Document