The LO port isolation degree of AD831 is only 15dB, and this value will not change with the amplitude and frequency of LO port signal, which is a constant value.

I would like to know how to calculate the C1, C2 and L1 values at the input to the AD831 mixer.

as far as i understand, C1 and L1 form an impedance matching network and C2 is the ac couupling capacitor. is this correct? my problem now is i'm not sure…

Hello, I am using the AD831 in my design, WITHOUT using the internal amplifier (using the differential current output) and I have a couple questions.

1. The internal gain indicated in the datasheet (pi/2) is provided by the gilbert cell or the output…

Hi!

Thanks!

Hi again,

I am having some problems adjusting the bias current of the AD831. According to the datasheet a resistor must be connected between the BIAS pin and Vp. And for minimum bias current, connect it directly without resistor.

The problem is that…

Hello,

i would like to use the ad831 for mixing down my voltage signal to fix intermediate frequency of 10 kHz.

the voltage signal varies in frequency from 10 kHz to 10 MHz.

So the idea is to mix down my signal with a frequency of f_signal + 10 KHz…

Hello. I have built a test circuit for the AD831 as per the single voltage supply on the data sheet.

I am feeding the RFin with 7Mhz @ 20mv LO with 3Mhz @ 10mv and a 9V supply.

The chip seems to get quite hot is this normal?

Regards - Paul

• ### AD831 - RF voltage input range

Hello,

I am an EE student designing my first  specialized receiver, but I came across a problem.

I do not know what the input voltage range of the incoming RF signal is for the AD831. And what would the IF output voltage be with those inputs, considering…

• ### AD831 OUT Pin AC-coupled

Can anyone tell me what is RT and CC for as shown in Figure. 10 of AD831 datasheet? I read it said output pin must be "ac-coupled to the load", so is this a high-pass filter network?

Besides, I am inputting 50kHz signal monotone into LO, should…