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26 Threads found on edaboard.com: **Positive Pole**

Yes - such a capacitor between C and E in common-B configuration provides **positive** feedback and, thus, increases the input impedance for rising frequencies.
This can be also described by the term "invers (negative) MILLER effect". However, at the same time, the gain decreases (C parallel to Rc).
Why do you expect an RHP **pole**?
[SIZE

Elementary Electronic Questions :: 08-25-2016 10:06 :: LvW :: Replies: **2** :: Views: **913**

1 st order are inherently stable but noisy
2nd order are less noisy and C2/C1 ratio affects **pole** position
3rd order are inherently unstable with >180 deg phase shift and negative feedback becomes **positive** feedback.
Rule of Thumb ratios help provide LPF additional rolloff using lag-lead filters to give phase margin at unity gain and may have

Analog Circuit Design :: 07-29-2015 15:30 :: SunnySkyguy :: Replies: **2** :: Views: **627**

As I recall the negative feedback loop may have zeros, but the transfer function of P(s)/Q(s) for the **positive** input is often 1/(1+H(s)) thus the overall gain never reaches zero unless H(s) =-1

Digital Signal Processing :: 11-13-2014 16:31 :: SunnySkyguy :: Replies: **2** :: Views: **770**

Hi guys, I have a problem about the stability of **positive** feedback.
Let's say for a opam, it has 3 **pole**s (LHP) at DC and 2 zeros (LHP) at wz. Then at DC, its phase shift is -270 degree , and at wz, its phase shift is -180 degree. At wz, its gain is 4.
Then we connect the opam in a unity gain negative feedback structure.
The phase margin of

Analog Circuit Design :: 11-03-2014 22:15 :: kerrytang :: Replies: **15** :: Views: **2886**

If Real(s1) and Real (s2) is **positive**, the circuit will absolutely be unstable regarding to Hurwitz criteria.

RF, Microwave, Antennas and Optics :: 10-30-2014 20:17 :: BigBoss :: Replies: **6** :: Views: **971**

Hello Analog guys
I designed a current mirror OTA with a partial **positive** feedback, the circuit is like the one I attached from Gregorian book, Figure Nr. 3.41.
After I finished the design , I have simulated the circuit with and without the **positive** feedback as shown in the first and second image respectively.
Here I have a couple of ques

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 02-04-2013 19:01 :: Junus2012 :: Replies: **21** :: Views: **2700**

You'll determine stability by analyzing the loop gain magnitude and phase characteristic. For the simple case of monotone magnitude characteristic, a **positive** phase margin implies stability. A considerably larger phase margin will be required for acceptable time domain behaviour, however.
Strictly speaking, an OP with only two **pole**s and real fee

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 11-25-2012 22:50 :: FvM :: Replies: **7** :: Views: **2790**

If you have a transistor with components connected from its collector circuit to its base circuit, its negative feedback, because when th collector signal goes **positive**, the base signal is going negative. If however you change the components so they introduce greater then 180 degrees phase shift and the transistor has a gain greater then 1. The cir

Elementary Electronic Questions :: 05-16-2012 16:20 :: chuckey :: Replies: **7** :: Views: **674**

Yes, I mean the Vcc, the + **pole** of the battery, call it how you want! Vss is how microchip calls it in the datasheets, that's why I used it like this.
I never saw the **positive** supply node named Vss in a datasheet. If pin 2 is the **positive** supply node and pin 1 more negative tahn pin 2, you'll expect a PMOS FET like Si2323.

Elementary Electronic Questions :: 01-24-2012 23:19 :: FvM :: Replies: **9** :: Views: **2320**

What is the inverse laplace transform of 1/(s+a)? What do you think happens when a is **positive**?

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 12-30-2011 10:03 :: checkmate :: Replies: **2** :: Views: **491**

Grounded load only means the the load is connected one end to a ground ..
In this case the current source sources current from the **positive** **pole** to negative **pole** (ground) through a load ..
If you use current source a current limiting resistor is not required ..
See:
A Constant Current Source

Elementary Electronic Questions :: 10-14-2010 04:05 :: IanP :: Replies: **2** :: Views: **2225**

That's not possible! Q factor by definition is always is **positive**. Check for calculation error.

Analog Circuit Design :: 05-05-2010 07:19 :: LvW :: Replies: **20** :: Views: **6960**

Thanks, flatulent.
I want to realize a rising phase vs frequency, so it need a **positive** **pole**, and negative zero. But in many paper and book, there are a negative **pole** and **positive** zero.

Analog Circuit Design :: 10-01-2009 08:30 :: rambus_ddr :: Replies: **5** :: Views: **1031**

is the other **positive** on the same side or opposite side?
(+)AC <-- (+ OR -)
AC-

Elementary Electronic Questions :: 09-30-2008 06:06 :: jdreev :: Replies: **4** :: Views: **3744**

It means you have peaking caused by a conjugated **pole** pair around 105 MHz. This pair is probably unwanted and can be caused by a feedforward path or **positive** feedback at that frequency. If you used feedback, is your phase margin large enough? You might be close to instability at 105MHz.

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 01-11-2008 10:05 :: ce :: Replies: **2** :: Views: **826**

Elementary Electronic Questions :: 01-03-2008 13:29 :: cesare :: Replies: **5** :: Views: **12992**

what you see are more **pole**s at f=1e8 . Each **pole** adds phase shift, but phase shift larger than minus 180 degrees is subtracted from plus 180 degrees (kinda fuzzy explanation). Basically what you are seeing is that the phase shift is clipping.
Also the magnitude shows a **positive** peek as well again, this indicates some zeros at that point.
Hope

Analog Circuit Design :: 11-02-2007 15:14 :: demodb :: Replies: **1** :: Views: **2474**

I have derived a transfer function containing 3 **pole**s. All the coefficients are **positive** but from matlab analysis, there is one LHP real **pole** and a pair of RHP complex **pole**s. Previously, I have a misconception that a cubic equation having all +ve coeff will yield all **pole**s in the LHP. Could some mathematics (...)

Analog Circuit Design :: 05-22-2007 14:02 :: pseudockb :: Replies: **3** :: Views: **3671**

If I am not wrong, I read that the B+ comes from the Battery **positive** connector/**pole** used in old vacuum tubes/valve operated equipment (radios).

Elementary Electronic Questions :: 05-07-2007 11:52 :: rkodaira :: Replies: **3** :: Views: **859**

Dear All,
why a **positive** zeros in a transfer function creates negative phase shift (just as a **pole**) ?
Thanks for answering.

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 02-22-2007 17:50 :: Tahar :: Replies: **1** :: Views: **720**

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