TGRT

New prototype, new milestone

Nutube 6P1 headphone amplifier
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New project - TGRT3WMB
+ 3-way active crossover
+ balanced output
+ FPGA-based multibit deltasigma DAC (7-bit DAC)

7-bit FPGA-based deltasigma audio DAC
Balanced and Single-ended output
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New topology FPGA-based 1 bit and multibit delta-sigma DAC simulation.
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UAC-2 USB audio interface project

Using:
+ ST Arm Cortex-M7 STM32F723ZET6,
+ 2 Low Phase Noise XOs
+ built-in digital volume
+ many GPIOs for future functions.

Prototype board was tested. It supports up to PCM 32bit/384khz.
In the next steps, It will integrated into a usb UAC-2 receiver board or USB FPGA DAC

Multi-bit Delta-Sigma Digital to Analog Converter (DAC)
How many bits do you want? 1bit, 3 bits, 5 bits or 7 bits ...
The DAC design, simulation and verification used Quartus, QuestaSim and Python.

Compare to 1-bit Delta-Sigma DAC
https://www.facebook.com/fpgaaudio/posts/135205545387256
EVB: https://www.facebook.com/fpgaaudio/posts/126402246267586

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FPGA-based DAC full simulation.
From input data, interpolation, digital filter, dsp to analog filter and output.
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Compact and portable DEV. Kit for audio player, USB audio, fpga DAC/DSP...
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Tiny FPGA-based DAC/DSP for audio
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About Digital Filter for Digital Audio
Digital signal processing (DSP) is the use of digital processing, such as by computers or more specialized digital signal processors.
FPGA and DSP represent two very different approaches to signal processing – each good at different things. There are many high sampling rate applications that an FPGA does easily, while the DSP could not.

The common filter of the DSP are Cascade integrator-comb (CIC) filter, Finite impulse response (FIR) filter, Infinite impulse response (IIR) filter.

This post shows how to design a FIR filter for slow signal such as audio signal.

1. Simulation FIR filter to choose design method and find out the array of coefficients.
2. Implementing the fiter on FPGA.
3. Evaluation the quality of result.

FPGA-based Audio DAC for Raspberry Pi
+ FPGA-based delta sigma (1-bit) DAC
+ Data input: I2S 32bit/768khz (max.)
+ I2S Asynchronous FIFO
+ Ultra-low phase noise oscillator Crystek CCHD-957 series and ultra-low noise, high PSRR linear regulator ADM7150
+ Balanced and single-ended analog output
+ compatible with all music streaming and music server software ( , , , ...)

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Personal Page for my hobby, FPGA-based DAC/DSP and audio

TGRT updated their business hours.

TGRT updated their website address.