Blog Archives

Variable Gain Amplifier

This project is a design of a low frequency Variable Gain Amplifier which is intended to be used for amplitude adjustment in order, to for example use the full dynamic range of an ADC. The project came up when experimenting

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PICkit2 programming with MPlabX – PIC16F690 UART ADC

A while ago I discovered that I own a PICkit2, which I had bought a while ago when I started to study microprocessors. With MPLabX Microchip has a IDE which runs under Linux, so I gave the kit a second

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Interpolation implementation in VHDL

This is a follow up on the previews article on the low and high pass filter designer. An algorithm is developed in order to perform interpolation. The FIR low pass filter from the last post is used in the interpolation

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Low and High pass filter designer for implementation in VHDL

This post is about digital low and high pass FIR filter design in VHDL. Implementing high/low pass filter in the digital domain has a lot of benefits compared to implementations in the analog domain. The VHDL code for an implementation

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Design of a FPGA PCB including USB2.0 interface and two 80 MHz ADCs

This is my most advanced homemade PCB design until now. The PCB contains a EP3C5E144C8N Cyclone III FPGA from ALTERA, two 8 bit ADCs AD9057 from Analog Devices @ 80 MHz, a FTDI USB2.0 controller and many other things. The

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Build your own Software Defined Radio (SDR)

This project describes how to build you own Software Defined Radio (receiver part). Starting from an antenna, amplifiers, mixer, filter, ADC, FPGA a FM radio signal is received and demodulated in software. All the blocks for amplification, mixing, filtering and

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A GNU Radio Source Block for the FT232H USB 2.0 controller

Here comes the documentation on how to write a source block for GNU Radio interfacing the FTDI FT232H USB 2.0 controller. This is particular interesting when one is willing to build an own Software Defined Radio (SDR) using an FPGA

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