Discrete chopper switch

Hi CVictor914,

It looks like you want to create a discrete chopper amplifier, which was typical in the last century, because there were no such integrated circuits. I'm correct?

Regards,

Kirill

Hi KirV,

Thank you for your reply.

Acually, chopper amplifier is not my target. I just want to use a chopper to realize the function of multiplication. For clarification,  I have an analog input signal and I want to multiply it with a sequence of 1 and 0. And the output is connected to a differential amplifier.

I know it's hard to find a discrete chopper switch. Do you have any other suggestions?

Thanks.

Victor

To use a magnificent amplifier only as a switch is very strange:)

Ok, If you need high-quality switch, I recommend look at this product:

https://www.analog.com/media/en/technical-documentation/data-sheets/1043fa.pdf

And here all similar products:

https://www.analog.com/en/parametricsearch/11487

It is suitable for your purposes?

Regards,

Kirill

Hi KirV,

These two looks helpful.

I don't want to use amplifier as switches. I only want to use switches as the topic of this question requests. Maybe because chopper usually is used in chopper-stabilized opamp, it makes you confused.

In fact, I am searching for a chopper switch which usually consists of four normal switches, for instance, four NMOSs. I can use one control signal to control them. However, if I search "chopper" in ADI product list, it shows chopper amplifier. 

Now I think I should look into the switch list.

Thanks.

Victor

I mean one control signal by one control signal and one signal inverted from it, not just "one".

Hi Victor,

Yes, you're right, it confuses me a bit, thank you. You can also attach at least a simple diagram of your idea. Maybe I can help you with something.

Hi KirV,

Thank you so much for your help.

My idea is shown in the first figure below. I use a chopper (principle shown in the second figure) to multiply analog input voltage with +1 or -1 according to the control signal, say PRBS. And then, the output of chopper goes through a differential integrator. 

I am searching for a device which can achieve the function of chopper above (4 switches and controlled by a logic signal). So far, https://www.electroschematics.com/4066-ic-datasheet/ 4066 is a choice. Do you have some advice?

Furthermore, because here is the group for amplifier, I also wonder which amplifers fit for my differential integrator. 

http://www.ti.com/product/ACF2101/technicaldocuments This is the only integrated integrator chip I found. Do you know any amplifer from ADI can be easily implemented as an integrator with reset switches? It will be very appreciated!

Victor

Hi KirV,

Thank you so much for your help.

My idea is shown in the first figure below. I use a chopper (principle shown in the second figure) to multiply analog input voltage with +1 or -1 according to the control signal, say PRBS. And then, the output of chopper goes through a differential integrator. 

I am searching for a device which can achieve the function of chopper above (4 switches and controlled by a logic signal). So far, https://www.electroschematics.com/4066-ic-datasheet/ 4066 is a choice. Do you have some advice?

Furthermore, because here is the group for amplifier, I also wonder which amplifers fit for my differential integrator. 

http://www.ti.com/product/ACF2101/technicaldocuments This is the only integrated integrator chip I found. Do you know any amplifer from ADI can be easily implemented as an integrator with reset switches? It will be very appreciated!

Victor

My appeal works...