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60 Threads found on edaboard.com: **Pole Zero Circuit**

H(s) = (1+s/Wz1)/(1+s/Wp1)(1+s/Wp2)
When we get **zero** frequency in analog amplifier design, we assume that transfer function is equal to **zero** at **zero** frequency(because numerator will be **zero**)
But H(0) of the above transfer function is actually unity for any finite **pole** and **zero** values.

Analog Circuit Design :: 03-23-2017 15:52 :: FvM :: Replies: **7** :: Views: **1302**

Hi,
From the little I know, op amps with feedback can become unstable and oscillate due to **pole**s and **zero**es, something or other about unity gain at the crossover frequency. A **zero** introduces a phase shift of +90? and boosts the gain by some amount in dB, a **pole** introduces a phase shift of -90? and decreases gain by some (...)

Elementary Electronic Questions :: 12-17-2016 10:25 :: d123 :: Replies: **2** :: Views: **977**

I do not know the answer but I know what is a **pole** and a **zero**. When the numerator becomes **zero**, the whole function becomes **zero** and the solutions of the equations are the roots. The function has **zero**s at the roots.
When the denominator becomes **zero**, the function becomes infinity. The points (...)

Power Electronics :: 07-09-2016 14:36 :: c_mitra :: Replies: **3** :: Views: **1496**

Hello,
attached you see an architecture of a linear voltage regulator, which should be any load stable.
Can anyone help me to estimate the **pole**s and **zero**s of this **circuit**?
I think there should be three **pole**s and also one **zero** over C0.
The **pole**3 is approximately gmn/(2piCL) if gm is (...)

Analog Circuit Design :: 04-03-2016 09:14 :: 1mace1 :: Replies: **0** :: Views: **527**

Question 1:
Shown in the right figure, a resistor R2 in series connected with a parallel R1 and C1, which forms a **pole** :1/(R1*C), and a **zero** : 1/(( R1//R2) *C).
The **zero** contributed by the effective resistor

Analog Circuit Design :: 03-27-2016 03:19 :: shanmei :: Replies: **0** :: Views: **576**

I want to learn .PZ analysis in hspice and in order to do so I created a simple testbench for a RC **circuit**:
R1 A B 1k
C1 B 0 1n
Vpz A 0 DC 1 AC 1
.PZ V(B) Vpz
I expect the **pole** to be at 1MHz but spice gives me extremely weird results:
**pole**s (rad/sec) **pole**s ( hertz)
real imag (...)

Analog Circuit Design :: 02-26-2015 01:42 :: seamoss :: Replies: **2** :: Views: **2309**

Hello!
The attached is a loop of a regulator (I drew an extra stage as a square at the output).
There is an extra loop from the Cc capacitor.
I have to admit I have **zero** theoretical knowledge on how to analyze a **circuit** with two feedback loops.
Let's also assume that I cannot change the topology and/or remove Cc or something.
Loop stabili

Analog Circuit Design :: 11-23-2014 14:21 :: geozog86 :: Replies: **2** :: Views: **765**

Hello
How can find **zero**s & **pole**s of **circuit** in Pspice(Ac sweep)?

Analog Circuit Design :: 08-27-2014 07:17 :: ehsantech :: Replies: **1** :: Views: **1859**

Hello.
I designed a half bridge converter by using tl494 chip. and so it's 2**pole** - 2**zero** compensation network.
but this configuration is suitable for inverting error amp configuration not non inverting like tl494. Now I confused how to solve this problem for make **circuit** to be stable!
Actually using a RC feedback in non inverting (...)

Power Electronics :: 06-11-2014 08:16 :: zereshki :: Replies: **3** :: Views: **2584**

how can the following parameters of any MOSFET amplifier **circuit** can be calculated just by inspection?
-input impedance
-output impedance
-gain
-**pole**
-**zero**
please give reference of webpage and/or books so that i can study further

Analog Circuit Design :: 02-20-2014 18:38 :: mdmIC :: Replies: **1** :: Views: **1489**

The lowpass time constant is lower by a factor of 100:
T=C*(680k||6.8k)~C*6.8kohms=860 ?sec.
Due to the non-invertiging topology, it's no pure low-pass, the transfer characteristic is "1 + LP", a **pole**-**zero** combination.
The low-pass time constant (**pole**) is 68 ms as said by Tunelabguy, 680 us is an additional **zero**.

Elementary Electronic Questions :: 11-23-2013 14:56 :: FvM :: Replies: **9** :: Views: **1001**

The Bode plot shows clearly a transfer function with a **zero** at s=0 and a high-Q pair of **pole**s. An additional **pole** at high frequency produces an increased slope at the right of the plot.
As far as I can see, the exact topology of the **circuit** can not be completely inferred.
FvM's **circuit** in post #13 produces (...)

Elementary Electronic Questions :: 09-22-2012 03:57 :: zorro :: Replies: **36** :: Views: **4938**

Hi I have a common source amp by active load pmos . I analyse that by hspice. my hand calcoulation for **zero** and **pole** is :p1=107meg p2=9.44gig and **zero**= 588gig but .pz analyse give me 5 **pole** and 4 **zero** that are not match by my hand calculation? **circuit** have 2 node then soulde have just 2 (...)

Analog Circuit Design :: 05-30-2012 14:32 :: paramis :: Replies: **1** :: Views: **1126**

all components tend to have SRF elements, even very carefully controlled impedances and transmission lines.
Can you display S11 to see if there is **zero** on the input that created a **pole** on S21?

RF, Microwave, Antennas and Optics :: 04-30-2012 19:17 :: SunnySkyguy :: Replies: **2** :: Views: **661**

hi, i've seen this **circuit** in a book talking about current-mode design longtime ago
if i'm right, the R here is to increase the bandwidth, the **pole** will change and it also add a **zero**.
you can calculate the small signal transfer func from the input current to the voltage of the M2 gate

Analog Circuit Design :: 04-29-2012 01:52 :: windknows :: Replies: **3** :: Views: **2042**

Sapwin is a free very user friendly analogue **circuit** simulation program. Features include :
Symbolic transfer function from a user defined **circuit**
Numeric transfer function
**pole** **zero** digrams
Bode plots
Gain and phase response
Step and impluse response

Elementary Electronic Questions :: 03-26-2012 08:28 :: klystron :: Replies: **6** :: Views: **1085**

Dear all:
When I simulate a LDO **circuit** by Spectre, I find a dominat **pole** at low frequency on Bode plot.
But in pz analysis of Spectre, there's no **pole** at low frequency.
Why the two results between Bode plot and pz analysis are quite different?
Does the miller cap compensation will effect the pz analysis results?
In my pz analysis: (...)

Analog Circuit Design :: 09-28-2011 14:07 :: tshiu :: Replies: **7** :: Views: **7228**

Hi my friends!
I know that what are the **pole** and **zero** . but i don't know that how can i find the place of **pole** and **zero** of my **circuit**. and i don't know that how can i optimum those with feed back . i need a simple and practical article about it. (my mean is that i want to move the place of (...)

Analog Circuit Design :: 09-25-2011 08:18 :: LvW :: Replies: **5** :: Views: **798**

When I tried to find input impedance function's **pole** **zero** of a parallel LC network using Multisim
**pole** **zero** analysis, I get following message
"
...........
| | doAnalyses: matrix is singular
| |
| |
| | pz simulation(s) aborted "
The **circuit** as well as log file attached. (...)

Software Problems, Hints and Reviews :: 08-05-2011 08:51 :: sagar_echip :: Replies: **1** :: Views: **2141**

Hi TIA,
This **circuit** is not exactly a 2nd-order lowpass (it has a 3rd **pole**, and a **zero** at s=0 too), but this is the idea:
The peak of the frequency response of a transfer function containing a pair of **pole**s does not coincide with w0. The location, height and sharpeness of the peak depends of the damping factor too, that in (...)

Power Electronics :: 07-21-2011 04:33 :: zorro :: Replies: **2** :: Views: **1100**

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