# analog circuit

1. ### Demodulator design for differentially modulated signal.

Hello, I am demodulating differential signal using LPF based demodulator. The schematics of the entire system is attached which include diff modulator, coupling capacitors, and demodulator. A modulated signal of 17 Mhz is demodulated. For the demodulator, I designed a 2-stage differential...
2. ### Input and Output Impedance of the Common Emitter Amplifier

Hi, I just have solved one of the bjt common emitter question below. However, I'm curious that how can I additionally find those things below: 1) Input and Output Impedance 2) AC Gain Here is the example and my hand draw solution. However, the question only asked to find Vout/Vin... Also, my...
3. ### Non Inverting Summing Amplifier Design

Dear Team, I need to design a summing amplifier with 2 inputs. My input one is a DC voltage source of value 1.6V and the second one is a square wave whose amplitude is 5V and max frequency is 1Mhz. The requirement is when the square wave is LOW(0V) the summer output should be 1.6V and when...
4. ### CMOS Two stage amplifier design for differential modulated signal.

Hello everyone, I am designing LPF based differential demodulator(LPF_DDM) to retrieve differentially modulated signals, which are on-chip capacitive isolated [shown]. LPF_DDM includes a differential amplifier, LPF, and Schmitt trigger. I designed a two-stage opamp [specification below], as a...
5. ### Noninverting Configuration With Hysteresis-Clarifications required

Dear Team, I need some clarifications for a non-inverting comparator design. I am using TLV7031 from TI.The circuit configuration is given as shown. In the datasheet it is given as " When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise to VIN1 ". This...
6. ### Trying to design an audio circuit with a carbon single button microphone so that I can output the audio into a PC

So I recently purchased a 285W western electric transmitter as I'm trying to more or less make a microphone that can plug into a computer which uses a carbon button microphone from the early 20th century. I have little education in circuit design, though I know enough to know I probably made...
7. ### LM7171 Non Inverting Amp Output Glitching

Dear Team, I am designing a clock distribution network using LM7171. This opamp is used in the non-inverting configuration with a gain of 2. My input clock frequency is 2.4Mhz, Amplitude is 3.6V.I can see glitching at the output. May I know where I went wrong?Please find the circuit diagram...
8. ### Schmitt trigger based NAND gate

Hello Everyone, If someone can help me to understand how to calculate the hysteresis of the Schmitt trigger-based NAND gate? Which MOSFET's dimension decides the Vth_H and Vth_L? Thanks
9. ### How to deal with Process corner variations in analog circuit.

Hello, I have designed an LPF demodulator. In a normal situation it's working fine, however when i carried out the Process corner simulation, the threshold voltage of MOSFET changes which is obvious, due to which MOSFET's operation region changes, ultimately change the output. My question is ...
10. ### Schottky Diode as overvoltage protection

At work, they are using this structure to protect an analog pin on a micro-controller from overvoltage. I simulated the circuit and wired it up to test it (physically), but the output is linear in both (which I expected). One engineer at work assures me this works, and that once V5 = V6 + 0.6V...
11. ### Recursive implementation of combinational logic

Hello Everyone! I'm trying to implement a recursive implementation of the following function **We are allowed to use also $Multiplexer(2^n : 1)$ gates. If anyone has any idea and wants to share it I'd be glad to hear :) Have a great day!
12. ### Need transistor circuit to control optical switches

I am a digital designer so anything analog is out of my expertise. I need to control an optical 2x2 switch with the following truth table: The pulse is in the msec range and the driver current is about 200mA. I have an FPGA that can control the transistors but not sure how to arrange them...
13. ### I cannot understand why oscillations happens at gain less than 1?

Hello Everyone, As I am reading the book of Op Amp for Everyone, chapter feedback theory. I come across this paragraph that I could not understand well: Stability is determined by the loop gain, and when Aβ = –1 = |1| ∠–180° instability or oscillation occurs. If the magnitude of the gain exceeds...
14. ### Attenuator Circuit for Headphone output -> Microphone input

Hi, I have seen several different threads about this but they seem either unanswered, or the solutions have not worked for me.. My goal is the following: I would like to connect the headphone OUTPUT from my electric guitar amp to my PC microphone INPUT (both are 3.5mm 3 pole jacks). My...
15. ### High precision 1mAmp current source

Hello, I am looking for a 1 mAmp DC current source circuit design with 0.02% precision to be used in a 5V power supply circuit board and a 3KOhms load. Any suggestion/direction would be helpfull. Thank you all.
16. ### Transistor as an amplifier

I'm currently working on this circuit and I run upon this question which I'm not sure I understood it correctly : For starters I have these values below - UCE=5V R1=6.1kΩ R2=1.35kΩ RE=1kΩ R3=1.5kΩ V1=15V IC=2mA UBE=0.4V B=180 Given formula rBE≈40mV / IB First I calculated CE with the use...
17. ### NEED HELP TO MY HOMEWORK

I need help with these questions especially the third one is a bit hard to understand for me. You don't need to solve it. Just a little explanation
18. ### Type of this electronic Object / device

Hi guys, Im fixing my communication board called : CENTRAL LIGHTSYS RP432M00000E and I found this device (see in the photo) is unattached /disconnected .. what type of this device? it sounds like capacitor but there's no symbol for if it's capacitor or whatever .. (there's nothing written on...

20. ### Ultrasonic Rangefinder using Analog Components

Hey, I'm new to electronics, and for one of my projects, I'm supposed to design an Ultrasonic Rangefinder using Analog components only! The components include the 555 timers, SN74HC chips (specifically the 4 bit counter), 7 segment display and etc. Most of the guides I have found online use an...