What does having 2 stages of intergators do?

[danny davis]

Another circuit board at work they use two op amp intergrator circuits in series one after another

The First Op amp intergrator is the RC time delay to reach the input threshold of the #2 second Op amp intergrator

They are in series one after another, 2 stages of intergators

What does having 2 stages of intergators do? a stepper slope?

1.) To measure the input threshold voltage crossing point of the 2nd Op amp intergrator, how would you do this please?

2.) To measure the "TIME to reach" the input threshold of the 2nd op amp intergrator, how would you do this please

 

[snishanth512]

Re: Two intergrators in series

Attach circuit diagram.

 

[FvM]

Re: Two intergrators in series

An integrator is a linear circuit and doesn't have a threshold parameter. In so far I'm unable to relate your questions to integrators.

 

[danny davis]

Re: Two intergrators in series

The Input to the intergrator has a threshold point right?

Comparators have a threshold voltage point, doesn't an intergrator?

 

[LvW]

Re: Two intergrators in series

A comparator is a switching device and, thus, has a threshold.
An integrator is used in the opamps linear operating region - and therefore, there is no threshold. It is just a frequency-dependent amplifier with phase shift.

 

[danny davis]

Re: Two intergrators in series

How is it an amplifier with phase shift? The output is a DC slope or ramp

 

[LvW]

Re: Two intergrators in series

How is it an amplifier with phase shift? The output is a DC slope or ramp

Perhaps you remember: The output depends on the input.
* For a dc input (switched-on for t=0) the output is - as you said - a dc slope.
* And what is the output if the input is a sinusoidal? Do you know the (ideal) transfer function of an integrator?

 

[danny davis]

Re: Two intergrators in series

No sorry I don't , but the output of intergrator#1 is not a sinewave , is a DC slope from +10 to -10 that's goes to the input of intergrator#2 , how do find out what the input voltage is when the output is intergrating? When the output is not intergrating the output is at +6 volts until the input of intergrator#2 has been turned on

 

[FvM]

Re: Two intergrators in series

Sounds like you omitted some details in your description. A series circuit of two integrators has no means to "turn on an input".

An integrator will hold it's output voltage (at least for short time) when the input is zero.

 

[danny davis]

Re: Two intergrators in series

why can't an iintergrator have a threshold parameter?

when u have two series intergrators what happens? the slope is stepper or delayed how so?

 

[Tunelabguy]

Re: Two intergrators in series

why can't an iintergrator have a threshold parameter?

because then it would be a comparator, not an integrator.

when u have two series intergrators what happens? the slope is stepper or delayed how so?

It depends on what the input is to the first integrator.

 

[Audioguru]

Re: Two intergrators in series

Where is the schematic?

 

[danny davis]

Re: Two intergrators in series

Here is the schematics of the 2 Series intergrators

U19 is an intergrator#1, and U21 is a intergrator#2

What does U19 do? and what does U21 do?

What does VR6 and VR7 do that's inbetween U19? what kind of circuit is this with the resistors and diodes like that?

 

[microntech]

Re: Two intergrators in series

A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output. It consists of an inverting amplifier element such as a transistor or op amp with its output fed back to its input through a phase-shift network consisting of resistors and capacitors.

 

[LvW]

Re: Two intergrators in series

A phase-shift oscillator is a linear electronic oscillator circuit that produces a sine wave output. It consists of an inverting amplifier element such as a transistor or op amp with its output fed back to its input through a phase-shift network consisting of resistors and capacitors...

...which are able to produce a total phase shift of -180 deg at one single frequency only.

 

[Audioguru]

Re: Two intergrators in series

Why does the SPAMMER talk about a phase-shift oscillator that needs 3 integrators? This circuit has only 2 integrators.

 

[danny davis]

Re: Two intergrators in series

There is No Phase shift oscillator at all guys

Intergrator#1 "SLOW STARTS" the intergrator#2 circuit slope output

I'm interested in how the SLOW STARTING works and what is it called? the slow starting is a voltage level straight line that hits a threshold voltage and then it intergrates down slope