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Direct Digital Synthesis: The Accumulator - ADI | DigiKey

07/03/2013 · Preview of ADI's Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator PTM

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All About Direct Digital Synthesis | Analog Devices

N2 - A new full simulation, design and verification of a Direct Digital Frequency Synthesizer (DDFS), utilizing only one quarter of a given sinusoidal wave, are presented in this study. A reduction in the size of the LUT is accomplished as the new design requires storing only a quarter of the sine wave. The Register Transfer Level (RTL) and the Gate level is implemented by the Quartus II. The Quartus II will then invoke the ModelSim Altera software to simulate the output. The DDFS consists of three major models, mainly a Phase Accumulator (PA), a Phase Register and a Look Up Table (LUT). All of the mentioned models are realized by a Verilog code. The spurious free dynamic range is achieved with a value of -73 dB using a 16 bit phase accumulator. The proposed design is verified through the application of different input frequencies and obtained results showed that output frequency is directly proportional to the tuning input frequency.

Answers to some questions about direct digital synthesis (DDS).
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A new full simulation, design and verification of a Direct Digital Frequency Synthesizer (DDFS), utilizing only one quarter of a given sinusoidal wave, are presented in this study. A reduction in the size of the LUT is accomplished as the new design requires storing only a quarter of the sine wave. The Register Transfer Level (RTL) and the Gate level is implemented by the Quartus II. The Quartus II will then invoke the ModelSim Altera software to simulate the output. The DDFS consists of three major models, mainly a Phase Accumulator (PA), a Phase Register and a Look Up Table (LUT). All of the mentioned models are realized by a Verilog code. The spurious free dynamic range is achieved with a value of -73 dB using a 16 bit phase accumulator. The proposed design is verified through the application of different input frequencies and obtained results showed that output frequency is directly proportional to the tuning input frequency.

Direct Digital Synthesis | Analog Devices

• Review of Synthesis Techniques • Phase-locked loop • Direct analog synthesis • Direct digital synthesis
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Hardware To generate a fixed frequency style, we start out with a clock source which just generates a pulse-train of fixed-frequency square waves which clock the binary counter whose output is connected to the digital to analogue converter ().

To keep things simple, we use a 16Hz clock frequency, a 3-bit counter and an whose output voltage is equal to the counter’s output. In terms, the counter is known as the phase accumulator.

The triangle channel’s output corresponds to Timer0’s PWM output on OC0B. The method used to generate triangle wave samples is identical to the direct digital synthesis scheme used to generate pulse wave samples: during every other overflow, if the triangle channel is not silenced, a 16-bit t_accumulator is incremented by an amount determined by the requested note frequency. t_sequencer is obtained by right-shifting the result, and is used an index into a triangle waveform sequence of length 32. This sequence takes on 16 possible values; it counts down from 15 to 0, and then from 0 back up to 15. The resulting value is scaled to a number between 0 and 255 and then written to OCR0B, updating the PWM output corresponding to the triangle channel.

Basics of Direct Digital Synthesis | DigiKey

03/10/2013 · A review of the basics of direct digital synthesis ..
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LUT: ( length: m, length [memorywidth]: n ), called also digital Phase-to-Amplitude Converter(PAC), or polar-to-rectangular transformation (projection of the real orimaginary component in time), or (sine) waveform mapping device - a MEMory.
Here we model all techniques of calculating data as simple lookup table operations.
The lookup memory contains one cycle of the waveform to be generated.
For practical considerations, only the high bits of the ACC are sent to indexthe LUT ( the size of the LUT is 2m words, phase truncation: m r ). LUT translates truncated phase information, being in digital form ( see ), into quantized numerical waveform samples - this is the most challengingpart of NCO.

phase resolution (m - bit) has to match with the amplitudeprecision (n - bit).

The pulse channel’s output corresponds to Timer0’s PWM output on OC0A. The pulse channel is implemented using the following direct digital synthesis scheme: During every other overflow, if the pulse channel is not silenced, a 16-bit p1_accumulator is incremented by an amount determined by the requested note frequency. p1_sequencer is obtained by right-shifting the result, and is used as an index into a pulse waveform sequence of length 8. The result is scaled to a number between 0 and 255 and then written to OCR0A, updating the PWM output corresponding to the pulse channel.

The phase accumulator counts by N to generate a frequency F out related to f …
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Direct Digital Synthesis (DDS) ..


Direct Digital Frequency Synthesis (DDFS or simply DDS), also knownas Numerically Controlled Oscillator (NCO), is a technique using digital-dataand mixed/analog-signal processing blocks as a means to generate real-lifewaveforms that are repetitive in nature. It is used especially for a precise,fast frequency and phase tunable output. DDS solutions can be implementedin LSI (large-scale integration) and they play an ever-increasing role indigital waveform and agile clock generation, and modulation.
As a discrete-time and discrete-amplitude system, DDS roots from sampling and quantizing theorems.

What is DDS | Direct Digital Synthesis | Electronics Notes

AB - A new full simulation, design and verification of a Direct Digital Frequency Synthesizer (DDFS), utilizing only one quarter of a given sinusoidal wave, are presented in this study. A reduction in the size of the LUT is accomplished as the new design requires storing only a quarter of the sine wave. The Register Transfer Level (RTL) and the Gate level is implemented by the Quartus II. The Quartus II will then invoke the ModelSim Altera software to simulate the output. The DDFS consists of three major models, mainly a Phase Accumulator (PA), a Phase Register and a Look Up Table (LUT). All of the mentioned models are realized by a Verilog code. The spurious free dynamic range is achieved with a value of -73 dB using a 16 bit phase accumulator. The proposed design is verified through the application of different input frequencies and obtained results showed that output frequency is directly proportional to the tuning input frequency.

This chapter introduces direct digital synthesis ..

A harmonic signal generator with adjustable frequency, phase and harmonic proportion is designed in this paper.

Key words: ARM 7, (DDS) Direct Digital Synthesizer (AWG) Arbitrary Waveform Generator, function generator

Reference
[1] Amauri A Assef1 Joaquim M Maia1, Fábio K Schneide (2013) A reconfigurable arbitrary waveform generator using PWM modulation for ultrasound research
[2] Mr.

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