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9 Threads found on edaboard.com: **Fractional System**

I tried to find a 14 bit number representation that matches the said value of -30.75 but didn't succeed. Apparently it's neither signed 8.6 fixed point nor a sign magnitude format with 6 **fractional** bits. How do you know that 11 1011 1011 0010 is representing -30.75?
**fractional** or fixed point formats can be defined in VHDL but there's no respecti

PLD, SPLD, GAL, CPLD, FPGA Design :: 05-28-2015 16:16 :: FvM :: Replies: **10** :: Views: **1532**

With N bits, you can represent 2^N equally spaced numbers in fixed point.
Which are those numbers is a matter of the numbering **system** or representation, for example:
* Positive integers from 0 to 2^N-1 in unsigned integer format
* Integers From -2^(N-1) to -2^N-1 in signed integer format
* **fractional** numbers from -1 to +1-1/(2^(

PC Programming and Interfacing :: 03-06-2014 20:59 :: zorro :: Replies: **4** :: Views: **690**

Number A is the input of the **system**, let's assume it's 0.123456. After the double precision number A has been processed in the **system**, I get the double precision result B(the actual result).
To get where my fixed point is, I apply the following procedure:
the final form is Q1.(N-1), which means 1bit for sign, N-1 bit for **fractional** (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 07-02-2013 12:21 :: naught :: Replies: **0** :: Views: **490**

It looks like the device implements **fractional** divider methods to achieve average time resolutions smaller than the **system** clock period. In this case, jitter will be an unavoidable side effect. But it's only a guess, I wasn't able to find the PWM generator details at a brief datasheet review. I think, Microchip didn't manage to present them clearly

Microcontrollers :: 02-18-2012 12:49 :: FvM :: Replies: **4** :: Views: **2448**

Hi,I don't know what do you mean by high resolution.which is usually defined by the hopping frequency around the center frequency.For example,in bluetooth **system** the local oscillator could lock at 2.4G~2.525G with 1M resolution.
1ppm resolution means that your hopping frequency is 2.5k.
**fractional**-N is needed here.Because 1us locking time is

Analog Circuit Design :: 09-16-2009 06:34 :: mengcy :: Replies: **2** :: Views: **1246**

Hi all
When I was doing the frequency synthesizer dimensioning (N-**fractional** synthesizer) in **system** level design (WiMAX standard, 3.4-3.6GHz, 10MHz the channel bandwidth), I found some ambiguity regarding the reference frequency and the division period (T=Fref/channel space),
For example how can I choose the Fref?
I know that Nfrac=Fout/Fref,

RF, Microwave, Antennas and Optics :: 04-27-2009 15:11 :: maysoun :: Replies: **0** :: Views: **758**

we wanna design a **fractional** pll with ring oscillator.
the input frequency is from 5M to 50M, and we set the bandwith to be 50khz, the segma-delta modulator is 3th order. the current ICP is varying with the N which varies from 1 to 128
the troble we meet is by calculation the Cs in the LPF is more than 1uF!, if we want the phase margin more tha

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 08-08-2008 07:54 :: jasonxilion :: Replies: **5** :: Views: **923**

Does anyone has the experience on **fractional** N PLL design?
it seems very difficult to implement it in a chip for me. many papers
have describled the FN-PLL principle, but few of them refer to the detailed realization methods.Can anybody give me any advice ? such as what is the design flow, which tool should be to use, and any good articles on th

Analog Circuit Design :: 01-12-2004 09:56 :: cirand :: Replies: **15** :: Views: **6096**

attached is a "DELTA SIGMA **fractional**-N Synthesizer" design Project created by @DS 2005A Design Guide. hope can help you....:D

Analog Circuit Design :: 01-26-2006 01:14 :: sunn :: Replies: **2** :: Views: **1881**

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lm358 | fully differential test bench | 8051 usb programmer | altium and library | scr phase control | pic16f877 lm35 | error control | lna design and gain | floats | place and route basic

lm358 | fully differential test bench | 8051 usb programmer | altium and library | scr phase control | pic16f877 lm35 | error control | lna design and gain | floats | place and route basic