# Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.

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### Problem with Capacitive Feedback Amplifier

I am building a capacitive feedback amplifier whose schematic is shown below. The circuit has two inputs and two outputs (fully-differential). One input is wired to dc ground and the other to an input ...
1 vote
884 views

### Calculating Equivalent Resistance between arbitrary pair of nodes in finite grid

I am having trouble understanding the concept of equivalent resistances. In the finite grid network pasted here, i know that if i want the equivalent resistance between the nodes at which the current ...
121 views

37 views

### Problem with Chopper Opamps Gain

I am simulating the open-loop gain of a chopper opamp. The schematic is shown below. The chopper opamp consists of an input chopper, a single-stage op, and an output chopper. I ran both the AC and ...
143 views

### Why is my "common gate amplifier" introducing a zero when it shouldn't be introducing one as per theory?

I am trying to simulate a cascode circuit followed by a source follower in LTSpice and observe its frequency response. I added a 100GH inductor to serve as negative feedback only for DC, i.e., the ...
36 views

### What is the right way to model power converter noise? Should it be considered as voltage or current?

This reference models the converter noise as voltage and the filter is an LC filter (from right to left). Another source mentions the converter noise should be considered as current source. Again ...
92 views

### Bandwidth of simple FM transmitter given in schematic?

The following circuit is a basic FM transmitter, which broadcasts for a limited range of about 10 meters. It is tuned by an LC tank circuit, where the capacitor is a trimmer one. I want to know the Q ...
486 views

### How does the speed controller of this cassette tape motor work?

I am new to this area and for my first project I am trying to build a cassette player. I am up to the point of figuring out the speed control of the motor. I have been analyzing this cassette player ...
1 vote
164 views

### How do I calculate total resistance?

As far as I understand, two resistors are connected in parallel if the node at both ends of both resistors are the same. And in series if only one node is the same. But what if between two resistors ...
141 views

### How to increase the carrier signal voltage of RF AM modulation?

The circuit below is an example for RF modulation: Question is about carrier signal voltage of RF AM modulation. What happens when the message signal is amplified and it would have more voltage and ...
825 views

### How is an inverting opamp adder circuit able to regulate its feedback?

Consider the typical opamp inverting adder as follows: Why don't resistor Rl and R1 form a resistor divider and impose 2.5V upon inverting node and drive it to saturation. How is opamp's feedback ...
29 views

### Calculate the output voltage from following figure if input is 1V [closed]

Figure shows a circuit consisting of an ideal op-amp. If the input voltage is 1 V calculate steady state amplitude of output voltage.
85 views

### Optocoupler not working properly, current in diode

I have got an optocoupler to switch an output between 0V and 3.3V. That output is also inverted with a NOT gate, but for simplicity, we could focus on just Out_Enable1 signal. As far as I understand, ...
261 views

### Capacitor PPM equivalent?

I have a 10nF capacitor who's datasheet gives 10% tolerance, and 15% total tolerance over temperature (-55 to 125C). It does not give it in ppm, for simulation purposes, how would I calculate it's ppm ...
141 views

### Distortion pedal volume and tone control messing up circuit

I have built a distortion pedal with 3 variable controls: gain, tone and volume. R8 is my gain control (it will be a potentiometer with 50k to 500k resistance.) R5 is the tone control, (low pass ...
10k views

### Why are these independent loops?

According to my textbook, abca with 2 ohm resistor is independent. A second loop with 3 ohm resistor and the current source is independent. The third loop, with 2 ohm resistor in parallel with 3 ohm ...
76 views

### Finding Norton current

I am trying to determine the Norton current between the terminals a and b of the network shown below. $Z_1$, $Z_2$, $Z_3$ and $Z_4$ could be resistors, capacitors or inductors. To do so, I ...
47 views

### Effective DC Gain of a Chopped Opamp

I am studying a chopper amplifier circuit and have come across the idea of effective dc gain of opamp. The effective dc gain of the opamp due to chopping is the gain at the chopping frequency. Please ...
213 views

### The zero-input and zero-state response of a circuit consisting only of a dc source and a capacitor?

From my understanding, the zero-input and zero-state responses of an RC circuit can be found by solving for the homogenous and particular solution of the ordinary differential equation found using ...
60 views

### Why is the voltage $V_c$ equal to the voltage source?

As I said in the title why is $V_c = V_{\text{in}} = 12$V? I tried applying Kirchhoff's voltage law (not sure whether I'm allowed), assuming that the current of the circuit moves clockwise I get : \$...
312 views

### Switched capacitors in an op-amp circuit

I am having trouble solving part (b) of this task. I would expect to achieve charge conservation equations, but considering that the inverting input of the op-amp is shorted with the output terminal ...
1 vote
286 views

### Derive equation for half-wave rectifier with inductor and DC source load

I am trying to analyze a half-wave rectifier with an inductor and DC source load. I am reading a book on power electronics and the equations the author came up with are shown along with the circuit. I ...
50 views

### Node voltages with dependent current source

This is the way I set up this problem: v1-v2/5 + v1/5 = 2I0/20 Io/10 + (v2-30)/10 = v1-v2/5 Setting it up that way gives me a v1 of 28.8 and v2 of 7.8, which isn't correct. I'm supposed to be getting -...
741 views

### Why are IC and IE different? Aren't the two 1k ohm resistors in series and thus the current through them should be the same?

Honestly I don't understand how this circuit works and that's why I'm thinking that IC and IE should be the same. Note: This problem is copied from Engineering Circuit Analysis Hayt, Kemmerly & ...
96 views

### How can I find the voltages V1 and V2 of the circuit?

I know I can reduce the resistances and make the problem a lot easier. But my question actually is how can I solve for V1 and V2 using kirchhoff's laws? Because I tried to do it this way but I can't ...
I have impedance data ($|Z|$ and $\phi$) of a diode, measured at a fixed frequency but depending on the applied bias. The diode can be modeled as a series resistance $R_s$ and a parallel circuit ...