ridwan.chendarma.com

Completed Master in EE

ridwan.chen — Fri, 26 Mar 2010 06:29:05 +0000

Finally completed my master project thesis.

FM RF to IF Chip

ridwan.chen — Sat, 23 May 2009 08:20:08 +0000

Look at this tiny chip. It is a RF to IF downconverter before demodulator. Today’s chips are getting smaller and smaller. It has a build in adjustable LNA, mixer, filter. I did not get the FM demodulator since I am planning to use this chip to implement an FM receiver on software side. This FM Software Define Radio will be implemented on Virtex II FPGA!… It will be fun to see it working.

ADC DAC 2 MSPS Implementation

ridwan.chen — Tue, 12 May 2009 10:11:46 +0000

Implemented ADC DAC 2 MSPS on Virtex II Pro FPGA. This is a 10 times higher in sampling rate compare to the previous post ADC DAC. The sampling rate is 2 MSPS and can go up to 4 MSPS.

So by using System Generator and a verilog blackbox I implemented an FIR high-pass filter and the result is very clean. high_pass_filter_scope_captures

MATLAB Error Integer too large in context

ridwan.chen — Sat, 18 Apr 2009 09:55:54 +0000

I recently experienced this error while using MATLAB. Error using maple… Error integer too large in context … This happens when I try to simulate an ESPRIT DOA estimation using atan function with symbolic expressions. The solution is to use:

clear maplemex % this works for me, this basically clears the Maple workspace
% and reinitializes the Maple kernel

Microcontroller App. Freq and Period Measurements

ridwan.chen — Thu, 19 Mar 2009 01:10:28 +0000

A simple app. using PIC18F4520 to display frequency and period measurement of an analog square wave input. Code is written in C, interrupts and internal timer1 are utilized. Display is on 2 lined LCD screen.

Schematic:

DSB-SC Modulation

ridwan.chen — Sat, 21 Feb 2009 08:51:14 +0000

DSB-SC modulation implemented using Analog Devices ADC DAC 200 ksps on Virtex 2 FPGA.

Microcontroller from Microchip

ridwan.chen — Thu, 15 Jan 2009 05:17:18 +0000

Just got this microchip microcontroller sdk today. It’s the 18 series. I can’t wait to start playing with it.

Angle of Arrival Estimation

ridwan.chen — Thu, 15 Jan 2009 02:30:20 +0000

I have recently join a research project group whom are working on antenna angle of arrival estimation. I believe the research project has been in its 4th year and I am currently learning on all methods or approaches to estimate the angle of arrival of the desired signals. This is something that I am interested in but it is not going to be my thesis. I am working on something related to Xilinx FPGA for my thesis.

Master Thesis

ridwan.chen — Tue, 06 Jan 2009 23:13:29 +0000

I am starting to work on my master project/thesis now. I am feeling energetic and cannot wait to get things to work! I do have a topic in mind but may change as I progress.

ADC DAC Chipsets

ridwan.chen — Mon, 05 Jan 2009 10:38:29 +0000

I was testing on this ADC DAC chipsets at the Lab. Analog sent two each with next day delivery for free. Otherwise those can run to about 200 bucks. Kudos to Analog.