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## CIC decimation in vhdl

step 1: try yourself. step 2: post results. step 3: ask specific questions about specific problems. Good luck with your homework! Nono, don't bother replying how unhelpful that was. Expend your keystrokes instead on googling for "cic decimation HDL" and such.

## Urgent ... Sample rate conversion of wav file in MATLAB

What does it mean - z = 2y ? To multiply use * symbol. For upsample or downsample use 'upsample' or 'downsample' commands. Or design an interpolation or decimation FIR or cic filter.

## FPGA implementation of a CIC decimation filter for a single-bit sigma-delta modulator

cic don't particularly need two's complement, because signed/unsigned is only a matter of number interpretation for addition and substraction. You can implement it either with unsigned or signed arithmetic. The data coding can be converted at the output, e.g. from offset binary to two's complement by inverting the MSB. In other word, do

## CIC decimation filter: does bit pruning affect the gain?

A cic decimator with power-of-two ratio R will keep the most significant bits and add less significant bits according to the useable dynamic range. If we imagine a fractional number representation, this corresponds to a gain of 1. Bit pruning is just the method to derive the required bit number of each stage after deciding about the output word wid

## about cic filters advantages of integrating and combing at lower sampling rates

what are the advantages of integrating at higher sampling rate and for comb filters lower sampling rate in cic filters

## some CIC layout problems to ask

Hi, I have two simple question to ask why doesn't the layout instance of MOS from cic library(0.35um) have bulk contact? I have only see diff and nimp for nmos but no pimp and how do I choose the contact type in calibre? ex: M1_POLY1 ,M1N,M1P... thank you

## Help with verilog testbench for cic filter.

hello, I have the same problem, I am new to DSP and verilog. I am an analog designer and I need cic filter for sigma delta ADC, can u help me with the test bench code , I used Meyer code for DUT with some modifications

## CIC or FIR decimation filter

Hi, I'm currently writing my bachelor's thesis. I read many research papers and came up with a very efficient and fast FIR filter structure. However, yesterday I received the parameters of the filter needed at the institute in order to program it on an FPGA. and to my surprise, they need a high-pass filter with a pass (...)

## Question about cutting bits in fixed point FIR

Hi ALL in now days i design FIXED POINT FIR that wil be implemented on FPGA the filtering unit using cic decimation followed by 2 fir LPF. the input to the unit is 32 bits - 30 fractions and 2 for real number. the end of the unit in 57 bits and i take just the fractions -51 downto 22. when i analyze the FILTER FREQUENCY RESPONSE (...)

## Designing CIC for delta sigma modulator

For a better understanding of your design, you should tell the full specification of your cic decimator. The width of individual integrator stages is commanded by the output width, cic order and decimation factor. It doesn't necessarily imply that all bits are significant. Some bits may be also omitted by (...)

## fir filter design ideas

The concepts behind FIR design are very well known. In reality, an FIR filter is known as an inner-product. It is so well defined that efficient methods are very well known -- cic and half-band. Further, it isn't even difficult to turn a least-squares "reduced basis" into a filter. Several "window functions" exists for those who don't (...)

## Cic decimation filter resolution

hi all i design now decimation unit to downsample signal samplesd in 1M to 2K i cascaded cic decimation then fir decimation and then downsample block ( in simulink). when i simulate the unit it looks good - i mean i can see the filter gain ( when the input is pulse) and i see the down sampling when the input is sin wave sampled by (...)

## down sampling in FPGA

cic decimation filters are a simple way.

## dcimation filter for high order decimation rate

I don't understand about a cic DC gain problem. A cic decimator with power of two decimation factor is usually designed to have unity gain for the most significant bit and a bit width according to the application requirements. It doesn't make sense to refer gain to the output LSB, I think. Frequency compensation with a (...)

## high order of decimation

Hi ALL I working on some application that gonna be implement on FPGA It involve with sample signal by 512 over sampling ratio and then decimate the signal by this OR - 512 (DELTA SIGMA MODULATION) does some one have a good idea for me about the decimation filter block i thought about 3 options- 1 - cic DECIMATE BY 128 and THEN (...)

## Decimate by high deciamtion factor using cic filter

HI ALL i am working now on some delta sigma application - i overasample the digital input signal by 512 then pass it through delta sigma modulator and then i need to decimate it (by 512) because i need to implement it on FPGA i thought to use cic DECIMATION FILTERS to decimate by 256 and then use fir to decimate by 2 (...)

## Test Bench for CIC decimation(5) filter

Read the error messages more thoroughly. The syntax error is in the component code, not the test bench. entity cic is generic(CI_SIZE : integer := 18; -- cic input data width CO_SIZE : integer := 30; -- cic output data width STAGES : integer := 5); port( -- This line is missing ce : in std_logic

## DSP cores and algorithms On FPGA

There's some code involved like cic filter, FIR filter, IIR filter ,Cordic algorithm and FFT in the book "Digital Signal Processing with Field Programmable Gate Arrays".Hope it would be helpful.

## ADC with 12 bits output

If I need 12 ENOB output do I have to implement decimation filter (cic) with decimation factor at least 4096? Most likely much lower, depends on the modulator characteristic and it's output spectrum. Refer to basic SD ADC literature. I'm not aware of clear definition of stable output bits.

## delta sigma cic filter

about delta sigma cic filter it consists of integrator , decimator and differentiator. lots of thesis discuss the mininmun word length for preventing overflow. and it says that it is the same as the average window filter in frequency domain. but if we disuss it in transient domain? since every integrator in each stage will (...)