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Type: Posts; User: mahdi3999
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22nd March 2018, 10:53
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 4,564
Closed: What technique can I use for this optimization problem?
Hi,
I am new to genetic algorithms. I have studied only a few very simple examples to learn about the basics of GA. I would appreciate if anyone can give me some hints what technique I can use for... 
15th November 2017, 09:17
 Replies
 1
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 5,170
Closed: Re: Algo of cordic to find the resultant coordinate not giving desired results on mat
I think you are making a mistake regarding the index of the q vector. For i=0 you have written a separate code using the if statement (this corresponds to the 45 degree angle). When the loop is...

1st June 2017, 07:40
Thread: Details of a CORDIC multiplier
by mahdi3999 Replies
 6
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 5,134
Closed: Re: Details of a CORDIC multiplier
This is interesting. Have you seen any reference using this method?
By the way, I was making a mistake in my calculations, with the CORDIC multiplier, we only need to scale z0 to the appropriate... 
31st May 2017, 07:17
Thread: Details of a CORDIC multiplier
by mahdi3999 Replies
 6
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 5,134
Closed: Re: Details of a CORDIC multiplier
Hi CCNezin,
I can add this to your explanation that the CORDIC multiplier requires a sufficiently small z0 because after n iterations we have approximated z0 with a sum of powers of two. This... 
31st May 2017, 04:14
Thread: Details of a CORDIC multiplier
by mahdi3999 Replies
 6
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 5,134
Closed: Re: Details of a CORDIC multiplier
Hi CCNezin,
Thanks for replying.
Your explanation seems quite reasonable but, with this explanation, we never need to set the initial value of y to zero (y0=0) neither we need to scale x0 and... 
21st May 2017, 18:29
Thread: Details of a CORDIC multiplier
by mahdi3999 Replies
 6
 Views
 5,134
Closed: Details of a CORDIC multiplier
Hi,
I am looking for the details and proof of the CORDIC multiplier. I found a paper and a pdf which summarize the algorithms of the elementary functions but the linear mode of CORDIC is only... 
17th May 2017, 04:53
 Replies
 1
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 678
Closed: Re: Gain of amplifier with current source load
Hi,
In the commongate structure, the source voltage is determined by a voltage source, Vx. So, the transistor's gm will produce a current equal to gm * (0  Vx). This current varies with Vx.... 
8th May 2017, 11:04
Thread: Piplelining for critical path delay
by mahdi3999 Replies
 8
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 1,393
Closed: Re: Piplelining for critical path delay
You try to divide the critical path into M portions where each of these M portions have almost the same delay. In pipelining, you need to allow the combinational circuit between two successive...

7th May 2017, 10:50
Thread: Question in Poles in miller Capacitor
by mahdi3999 Replies
 4
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 998
Closed: Re: Question in Poles in miller Capacitor
Assume that p1 and p2 are the roots of the denominator.
(s+p1)*(s+p2) = s^2 + (p1 + p2)*s + p1*p2
Multiply the above by b ( you can because the roots will not change) and equate with the... 
7th May 2017, 09:41
Thread: Question in Poles in miller Capacitor
by mahdi3999 Replies
 4
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 998
Closed: Re: Question in Poles in miller Capacitor
If you assume that the poles are p1 and p2 then p1+p2 = a/b and p1 * p2 = 1/b. Since a Miller capacitor splits the poles, we can assume that one of the poles happens at a much higher frequency...

3rd May 2017, 18:05
 Replies
 1
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 438
Closed: Re: [moved] Explaination of Loop Filter for PLL
Hi niteshtripathi,
If you apply an input current to the loop filter (current because the output of charge pump is current) and assume the voltage on the C2 as the output of the filter, then the... 
3rd May 2017, 17:01
Thread: 420mA signal conditioning
by mahdi3999 Replies
 3
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 828
Closed: Re: 420mA signal conditioning
I think the DC bias of the opamp is not correct. While you set the DC of terminal 3 to be zero, the DC of terminal 4 is set by that of the opamp output. Terminals 3 and 4 must have the same DC...

3rd May 2017, 07:34
Thread: implementation of a bandpass filter
by mahdi3999 Replies
 30
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 5,907
Closed: Re: implementation of a bandpass filter
Pass band can be calculated from the desired center frequency and bandwidth.
The stop band, center frequency, bandwidth and the required attenuation at the pass band and stop band are all... 
3rd May 2017, 03:35
 Replies
 2
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 841
Closed: Re: Help with results of a Wirelles Power Transfer Circuit.
Assume that you apply a current source Iin to a parallel RLC, at the resonant frequency, the voltage across the RLC will be Iin * R. The value of R affects the quality factor and the gain of the...

2nd May 2017, 14:38
Thread: Higher order RC filter phase shift.
by mahdi3999 Replies
 1
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 573
Closed: Re: Higher order RC filter phase shift.
You can calculate it just the way you calculate the phase response of any arbitrary transfer function (put j*omega instead of the s from Laplace transform, and calculate the phase). I think the only...

1st May 2017, 17:07
 Replies
 3
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 973
Closed: Re: calculation of transconductance
Obviously the square law equation is suitable for hand calculations and can give us a rough approximation of the transistor's operating point. However, the complicated model involves several...

1st May 2017, 11:52
 Replies
 3
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 973
Closed: Re: calculation of transconductance
I think you don't have to become involved in the complicated transistor models to find the transconductance of a transistor. Software can take all these parameters into account and give us the final...

1st May 2017, 08:28
 Replies
 27
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 5,455
Closed: Re: Precise High Current Sensing at 12.5 mV/Amp
It seems that, putting the buffer in the first stage, you will not have a 10k load for the sensor, right?
Regarding the RC filter, if we only take the noise and linearity performance into... 
1st May 2017, 07:51
 Replies
 27
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 5,455
Closed: Re: Precise High Current Sensing at 12.5 mV/Amp
Hi pradhan.rachit,
I think you will face a tradeoff between linearity and noise performance: if you use the amplifier in the first stage, you will have better noise performance but since the... 
30th April 2017, 20:39
Thread: implementation of a bandpass filter
by mahdi3999 Replies
 30
 Views
 5,907
Closed: Re: implementation of a bandpass filter
You can find some useful information here.
Mahdi 
30th April 2017, 20:36
 Replies
 1
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 1,230
Closed: Re: Designing a symmetric FIR low pass filter
Calculate the inverse discretetime Fourier transform of the target magnitude response. This will give you h_a[n]. Since you are asked to use a rectangular window with length 5, you only need to keep...

30th April 2017, 08:39
Thread: implementation of a bandpass filter
by mahdi3999 Replies
 30
 Views
 5,907
Closed: Re: implementation of a bandpass filter
First, you should determine what specs you are looking for, e.g. what's the center frequency of your filter, what's the 3dB frequency, etc.
Then, you can use either the classic filter design theory... 
27th April 2017, 05:07
Thread: current mirror ratio V.S. noise
by mahdi3999 Replies
 7
 Views
 1,658
Closed: Re: current mirror ratio V.S. noise
Reducing the flicker noise requires a large W and L.

26th April 2017, 16:53
Thread: current mirror ratio V.S. noise
by mahdi3999 Replies
 7
 Views
 1,658
Closed: Re: current mirror ratio V.S. noise
You only need to place a capacitor between the gate and ground if you are using an nmos current mirror. For pmos current mirror put the capacitor between gate and vdd.

26th April 2017, 06:34
Thread: current mirror ratio V.S. noise
by mahdi3999 Replies
 7
 Views
 1,658
Closed: Re: current mirror ratio V.S. noise
Using a large capacitor at the gate of the transistors, you can bypass the noise from the diode connected device. So you only have to minimize the noise of the mirroring device which is related to...
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