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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.
Hi, From the little I know, op amps with feedback can become unstable and oscillate due to poles and zeroes, 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 (...)
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 zeros at the roots. When the denominator becomes zero, the function becomes infinity. The points (...)
Hello, attached you see an architecture of a linear voltage regulator, which should be any load stable. Can anyone help me to estimate the poles and zeros of this circuit? I think there should be three poles and also one zero over C0. The pole3 is approximately gmn/(2piCL) if gm is (...)
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
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: poles (rad/sec) poles ( hertz) real imag (...)
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
Hello How can find zeros & poles of circuit in Pspice(Ac sweep)?
Hello. I designed a half bridge converter by using tl494 chip. and so it's 2pole - 2zero 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 (...)
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
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.
The Bode plot shows clearly a transfer function with a zero at s=0 and a high-Q pair of poles. 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 (...)
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 (...)
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?
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
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
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: (...)
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 (...)
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. (...)
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 poles does not coincide with w0. The location, height and sharpeness of the peak depends of the damping factor too, that in (...)