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Design >> Analog Design >> analogue mixer-double balanced for low frequnecy
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Message started by amir_hasanovic on Apr 4^th, 2008, 4:56am

Title: analogue mixer-double balanced for low frequnecy
Post by amir_hasanovic on Apr 4^th, 2008, 4:56am

Dear Sir/Madam,

Currently I am designing down-converter[b] for power line carrier application. One of component in down-converter design is [b]analogue mixer. This analogue mixer would be used to mix (RF) input modulated signal from power line (20KHz - 1MHz) with LO clock signal in order to frequency shift input signal in /selectivity filter bandwidth (12KHz -44KHz)./*
However, Power line carrier applications are dynamic and noisy environment. Input SNR /down-converter/(mixer) can be very low down to -20dB and RF input dynamic range 60dB.

So, I would like to ask you for recommendation of analogue mixer which have or is close to the following characteristics:
- SNRout should be very close to SNRin (Noise Figure in range of 1-5dB). Since RF input signal can be very noisy.(e.g. SNR = -20dB).
- On the output *should be only sum and difference. No RF and LO frequency*
- RF port:* frequency range: 20KHz -1MHz, dynamic range: 50dB-60dB, double balanced
- *LO port: *frequency range:8KHz -1MHz
- *Output*: frequency range: 10KHz -1MHz, *should consists of only sum and difference, no **No RF and LO frequency, no harmonics *

Thank you and Best Regards,
Amir Hasanovic

Title: Re: analogue mixer-double balanced for low frequne
Post by amir_hasanovic on Apr 8^th, 2008, 8:43am

Regards to this question, does anybody have any idea how to implement down-converting with above requirements without mixer?. (and programmable filter with huge number of parameters)?

Thanx