Analog circuits have a range of voltages, rather than just two as in digital logic.

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49 views

Should I be concerned when loop gain rises back above 0dB on simulation?

Interim update Okay, I just realized I screwed up on the simulation. When I added \$C_{bp}\$ I upset the "break" in the feedback loop necessary to get the loop gain. The left-side lead has to go to ...
1
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1answer
60 views

Why does smaller step show instability better?

I was stability testing a simple op amp circuit by applying a square wave to the input and looking for ringing etc. on the transitions. I figured, hey, I'll give it a big whack, say from 0 to 5V, ...
2
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3answers
56 views

How do I determine \$R_o\$ for an op amp?

I understand that when driving a capacitive load with an op amp, the output resistance, \$R_o\$, of the op amp interacts with the load capacitor to form a low-pass filter, introducing a pole in the ...
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9answers
1k views

Why are op amps used so frequently in analog electronics?

I've read in several books and papers the observation: "Op amps are the bread-and-butter of analog electronics", or "... op amps are the most commonly encountered building block in analog circuits ...
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2answers
163 views

what is Rail to Rail supply? [on hold]

I am new to analog electronics and I have been hearing this word from my seniors they always talk about Rail-Rail supply while working on some amplifiers and Opamp,also while calculating and designing ...
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0answers
55 views

Single to many analog signals

I am trying to drive two piezo inkjet print heads with an analog waveform varying from 0-40V, with a slew rate of 15V/us and a complicated waveform of a duration of ~20us. When printing only one ...
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0answers
26 views

How to correctly ground analog with concatenated PCBs

I want to ask how should I ground devices that have an Analog and Digital ground when I use multiple boards. I found sensor packages(for sensor packages I don't mean ICs, but small boards with min. ...
0
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0answers
39 views

Ultrasonic distance sensor with no microcontoller

For a task we have to come up with a way to use a 40 kHz ultrasonic transmitter and receiver pair to measure distance. The output must be an analogue signal proportional to the distance to the object. ...
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1answer
108 views

How can I easily convert an analog signal to a digital signal?

I've tried searching for an answer on this topic but I must be phrasing it wrong because I can't find anything. I have a voltage range of about a 1 volt. I want to pass it through an Op Amp (or ...
1
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3answers
64 views

Electrical noise sources in farms

I am designing the data logger of a solar-powered automatic weather station that will be installed in farms. It's used to gather data from environmental sensors (wired) and send it to a host using the ...
0
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1answer
54 views

How to transmit data from an analog multiplexer to an RS232 COM port on a PC

I am having trouble understanding how to design a circuit that will transmit multiple analog data signals to a computer through one RS232 COM port. The analog data is a simple voltage reading from ...
4
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7answers
335 views

What makes a circuit digital?

I've been trying to understand how a circuit becomes digital. I understand the different between an analog signal and a digital signal, but I don't see where digital circuits come from if all the ...
0
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2answers
52 views

An COTS solution for delaying a 120kHz analog signal?

Looking for some cheap method of adding a 350uS delay to a pulsed sine wave. It would be useful to emulate a pitch-catch ultrasonic distance measurement setup
0
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0answers
33 views

Switching low-voltage AC signal from microcontroller

I have a 5V 10MHz AC line which I need to turn on/off from a microcontroller. The microcontroller will be powered by the same input signal (through rectifier). What is the best way to do that?
2
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2answers
73 views

Generating microvolt signals

Is there a common way to generate relatively accurate microvolt (like 5uVpp, 0.5uV resolution) waveforms with bandwidth under 4kHz, output impedance around 1k? I can't think of much more than ...
0
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1answer
16 views

Calculating the Power of the Upper Sideband

I solved a question in a book that goes like this: If the carrier power is 1000 watts, what is the power in the USB at 70.7% modulation? I solved it using the formula: $$ P_{USB}=\frac{m^{2} ...
0
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0answers
34 views

Conditioning negative ADC voltage with separate AGND and DGND

I was looking to condition a negative voltage analog input for an ADC and I saw these two posts describing a voltage divider circuit to do so. How do I sample a -2 V to +2 V analog signal with a PIC ...
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1answer
51 views

I want to energize a solenoid based on a temperature without arduino?

I want to open a 12V solenoid valve and close another based on a temperature reading I will be getting from the lm35dz temperature sensor. I should mention, the solenoids are normally closed and they ...
1
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1answer
43 views

Brightness control with PWM dimming LED driver LM3406/06HV

I have an changing input voltage. I would like to feed it into LM3406 and have varying brightness from the Led. So I go through the datasheet. However,the only information and characteristic of the ...
0
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1answer
38 views

voltage at the analog input of micro

simulate this circuit – Schematic created using CircuitLab In the circuit the current i1 is flowing from external device. Now my doubt is what is the voltage developed at the analog input ...
0
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1answer
43 views

Voltmeter scaling resistor front-end and ADC calibration coefficients

I'm designing a voltmeter and current measurement system that forms part of a electronic load. Lets tackle the volt meter first. I'm using a 16-BIT ADC (AD7708) and want to measure the following ...
0
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1answer
54 views

Power rail decoupling caps for analog circuitry

First off, the terminology I'm using could be complete rubbish - I'm still learning I have a mixed signal board for measuring bio-signals. The 4 layer board will have a split ground plane, analog ...
0
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0answers
60 views

digitalRead(A0) returns true when A1 is HIGH [migrated]

I have an Atmega328P-AU with 16Mhz crystal(schematics). And its analog pins A0 to A3 are connected to button inputs. All these pins are pulled-down(10K res). And in code, I have digitalRead(A0) to ...
2
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2answers
114 views

Is it feasible to synthesise sound with analog circuitry these days?

A friend of mine who is a layman in terms of electronics asked me to teach him how to synthesise audio with some analog circuit and how to build it. For some reason it has to be analog. Probably ...
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1answer
37 views

AD5933 analogs for 4-terminal measurements

I'm going to do bioimpedance measurements, and it seems that AD5933 chip (http://www.analog.com/media/en/technical-documentation/data-sheets/AD5933.pdf) has many useful features for this. However, ...
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26 views

Expression of Output voltage in Triple tail cell

I was reading this article in one of the journals. In this a D-Latch has been proposed from a basic triple tail cell. Now when i was going through this i saw the implementation of AND gate with this ...
0
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3answers
48 views

4-20mA Loop powered DAC

I was selecting a DAC for HART network and in the process I came across two terminology. 12-/16-Bit, Serial Input, 4 mA to 20 mA, Current Source DAC AD5420 and 16-Bit, Serial Input,Loop-Powered, 4 ...
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56 views

How difficult is it to combine two composite output to one composite input? With rotation?

I am trying to input composite output from 2 point and shoot digital cameras to 1 composite input of tv. Is it possible to display them side by side and/or rotate them -90 degree each and again ...
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1answer
62 views

help related to frequency of schmitt oscillator

I have seen the CMOS Schmitt waveform generator circuit (i.e. figure 2nd) from the following link http://www.electronics-tutorials.ws/waveforms/generators.html I tried to simulate the circuit in ...
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2answers
103 views

How to switch between two analog outputs with a digital output?

I have a circuit with a 74ls93 counter and I want to use one of its outputs to switch between two analog output, i.e., when the output of the counter is HIGH, the output of the circuit must be V1 and ...
0
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1answer
73 views

What is wrong with my guitar amp?

I found this 1W guitar amp design on the Internet: http://www.diale.org/punch.html And I am trying to build it on the protoboard. I could not find the IC TDA7052, instead I've got the a TDA7052B. ...
-2
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1answer
33 views

Gain of a differential amplifier in PSpice

I am modelling a differential amplifier in PSPice using MOSFET. Here is the schematic: In this i want to track the gain of the circuit by changing the value of the width of NMOS. Now can anybody ...
0
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1answer
53 views

JFET Audio switch, does not work in simulation?

This is a circuit I've found online and apparently it is taken from the very rare audio book by National semi. The circuit is used to switch a signal on and off at a transition time that the user sets ...
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2answers
98 views

Why mosfet is preffered over voltage divider for voltage level shifting

Before writing this question I read several similar threads, but didn't found the answer I am looking for. When we need a voltage level shifter the first thing that come to the mind is a voltage ...
0
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1answer
63 views

analog error pcb

I am building a scale with a load cell and a INA122 equivalent circuit. When I build it in a breadboard I get very good readings but when I place it on the PCB I only get a -3.8V at the output of the ...
0
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4answers
93 views

What will happen when two capacitors C1 and C2 are added in series instantly by a switching mechanism, How the charge sharing will take place?

Suppose there are two capacitors ( of capacitance suppose C1 and C2 ) .There is a switch S1 between them which is open for lone time .Initially the capacitor C1 is charged to a voltage V1 volt .Now at ...
2
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1answer
89 views

Signal on top of PWR line

See edits at bottom: I'm trying to design a network of circuits (see example below), in which a modular circuit (non-static, can be change, with high variability in current draw) is connected on any ...
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0answers
17 views

Pspice: Trouble in modelling an inverter using Current Mode Logic in Pspice

I am using or-cad 16.6 for modelling an inverter using CML logic family. I need a swing of 400mv with this inverter. I want to build this by using MOSFETS. Following is the schematic of the inverter: ...
0
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3answers
101 views

How do I perform logical operations without a micro-controller?

I would like to build some (hopefully) simple logic circuits without the use of a microcontroller. I'm a software engineer primarily so I think of things slightly differently. To implement this with a ...
0
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0answers
47 views

Gain in common source amplifier

Let us consider the Common Source amplifier depicted below: We know that the gain \$A_v\$ of a such circuit is given by \$A_v=-g_mR_D\$, where \$g_m\$ is the transconductance of the MOSFET. We also ...
3
votes
1answer
52 views

How can you build a floating two-port VCVS?

I have a control voltage at one point in a circuit which I need to duplicate at various other points (3 or 4, if I remember correctly). I'd like to use one potentiometer to control these voltages, so ...
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1answer
29 views

Value of Drain Current in BSIM3v3 in triode region

Here the value of drain current has been given as per the BSIM3v3 MOSFET model, but is there any reference where it has been shown how this value was calculated and what is the meaning of the ...
0
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0answers
23 views

Two different PMOS active load structure

The following is a extract from the book Model and design of bipolar and mos current-mode logic . Here we see one implementation of active load using PMOS. And this is how active load has been ...
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1answer
45 views

Calculating gate resistor value for enhanced active-region stability

I'm working on an electronic load design driving an n-channel MOSFET with an op-amp. I'd like to consider adding a gate resistor (R3 in the schematic) to improve the stability. I've searched quite ...
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4answers
170 views

How to test analog component before mounting?

I have been in a small factory today, they produced 4 kind of PCBs that all are simple analog boards, each month they produce 1000 of them. The problem is that till now, after mounting them almost 10% ...
0
votes
1answer
30 views

Is ACS712 isolation sufficient for SELV?

Can the Allegro ACS712 current sensor be used to measure mains current with enough isolation so that the isolation between the mains (230V) side and the logic side of the sensor is enough to achieve ...
3
votes
3answers
244 views

4-20mA to 0-3V3 Converter

Looking for a simple design to convert from 4-20mA signals to 0-3V3, I'm thinkin about configuration shown at picture attached. And I would like to discuss its suitability. It is based on: - A ...
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1answer
80 views

Comparing industrial vs. off-the-shelf analog input

Industrial controls are expensive and my company current spends a great deal of money installing them to monitor some rudimentary signals on equipment. For instance, we're trying to monitor: ...
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2answers
79 views

Driving a solenoid with low voltage source

I have a 5V solenoid here, but my power source (battery) is only 3.3V . It's a pretty small solenoid, so it doesn't need huge amounts of power, but directly connecting it to the battery terminals wont ...
1
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1answer
48 views

Significance of -1 slope in CMOS inverter transfer characteristics

In the CMOS inverter transfer characteristics what is the significance of slope of \$-1\$ at the points where \$V_{IH}\$ and \$V_{IL}\$ have been shown? And how is this the occurrence of the values, ...