analog circuit

I'm trying to design a analog square root sub circuit to process an input voltage and output sqrt(vin). I want to Use something other than a log and antilog amplifier with a voltage divider in between but I'm really struggling to design an alternative as I am still learning. I have tried a...

Hi everyone, I watch this video, min 3:30 upward, and it says that the demodulation of AM is when the diode is in the reverse biased but then the current flows!!! isn’t tit the current stop flowing when the diode is reverse biased? Crystal radio circuit analysis/diode demodulation (8-Analog...

Hi everyone, So, as I am reading this part of amazing book, the Celsius zero shift for two -terminal temperature sensor circuit of Fig 21.19 is not fully understood by me. what I understood: -The \[ V_{\text{Temp}} \] at the two terminal of the Zenner diode is directly coming from the circuit...

I am currently reading Gray,Hurst's book Analysis and design of analog integrated circuits, chapter 12, the Common-mode feedback circuit. On page 815, he said the following statement for improvement of resistive output loading of CMFB circuit. The following figure 12.17 is the CMFB circuit after...

as my question state, I am having trouble understanding the circuit using a NMOS/PMOS as a current source or voltage source according to the pins they are connected and also the input and output impedance present when looking at only one pin of the MOS. my lack of understanding comes in the...

Hi everybody, I'm taking a beginners DC circuitry course and I'm trying to learn on my own time about analog circuitry, something which has fascinated me for a while now. One of the things I'm trying to start with is, as the title states, a voltage follower, since this is (supposed to be) a...

Hi Everyone, I have the circuit that controls a dc motor using the L9110s motor driver. It is powered by a 1.5V AAA battery that is stepped up by the TI TPS61027DRCR TO 5V. The goal of this circuit is that when the ITR8307/TR8 Optical IR Sensor sees a white stopping plate, the motor no longer...

I tested a comparator MAX40025 using the universal board and discrete components. The blue curve is one input which is a short pulse, the pulse width is less than 50ns. The green curve is another input which I set to be a constant voltage(the threshold). This constant voltage came from a...

Hi all, I have the circuit attached as a way to ramp voltage up and down based on a customer's input of dual 4-20mA signals. This will then be turned into a PWM signal to control our motor. Is there a graceful way to handle the 4-20mA signals, as there can't be an instantaneous change. The ramp...

Hi Guys, noob here. - I have board A and board B. Both have MCUs. - I have a reset signal going from board A to board B. The reset signal is normally HIGH (3.3V) - I have a digital input signal (logic 3.3V) going from board B to board A. - current implementation is two wires going to board A...

I am studying the schematics of an analog isolator with variable gain (SIM 984 from SRS0, the isolator is bipolar and can handle positive and negative voltages. In the isolation part of the schematics (see picture below), the author uses two voltage references circled in red. Having read the...

I have been doing a school project in which I need to figure out the working principle of an existing BJT circuit, and then design a corresponding CMOS circuit of the same function and similar performance. Sort of like converting BJT technology circuits to CMOS circuits. In this picture there's...

I have the LTC2668 on my board, I am doing signal verification on it. https://www.analog.com/en/products/ltc2668.html#product-overview I found that all SEL1~8 outputs have weird drop of voltage before the main pulse as shown in the waveform below (this sudden voltage drops always happens at a...

Hi, I am hoping I may be able to get some guidance and or ideas in identifying a problem I have with an instrumentation amplifier I have designed. I have simulated the design in Circuit Lab, however I am not getting the expected output as desired during a DC sweep. Essentially, I have a voltage...

Hello, I would like to use comparator MAX40025A from Analog Devices. In the datasheet, it mentions that the input common range is from 1.5V to VDD + 0.1V which I don't understand the meaning. Does it mean both the input should be in this range, or the average of two inputs should be in this...

I am using one machine (which has a small motor) which has battery of 1.2v which got dead and i want to change the power source to USB. The battery is of 1.2V and 400mAh. Motor connected to works perfectly fine if provide the 1.2V from bench power supply. I want to use USB power supply instead.

Hi, I am looking for a way to change 0-3.6V to 1.5V to 2.4V. are there any possible options? I only have a +ve rail of 2.4V on my board and no negative rail?

I designed a circuit to process input from a sensor with a range of -300 mV to 300 mV. The desired output of the circuit is 0 V to 600 mV. To achieve this, I used the op-amp equation Vout = Vin + 0.3 as a basis for my design. However, when I simulated the circuit, the output was only around 900...

Hello all, I am making a multi-channel design in Altium Designer (like in the below image), the REPEAT prefix creates multiple instances of components but not power ports (+V, GND, ..). As you can see below in channel A, C29 becomes C29A but all power rails are the same for all channels...

Hi, I do understand that the C5, L3, C6 form a pi filter. But what is the purpose of the other capacitors i.e C8 and C7? What purpose do they serve?