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# to detect incoming low amplitude sine signal

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#### manissri

##### Full Member level 5
Hi am having query
i have one input signal of approx 0.1v with frequecy around 10-800KHz
we want to detect that input signal at output by using some digital control and with another electrical signal
as measurement reference ( a sine wave aprox 0.5v with freq of 500KHz)
the how to detect the input sine wave by using some digital control and reference sine wave

what circuit I can use to detect the input sine wave at my output

Is input signal accompanied by appreciable noise ?

Do not understand the need for the ref signal ?

Once you detect the signal what do you do with the presence of that signal ?

Regards, Dana.

Is input signal accompanied by appreciable noise ?

Do not understand the need for the ref signal ?

Once you detect the signal what do you do with the presence of that signal ?

Regards, Dana.
HI Dana
Actually some how we need to detect the input signal by using these referene or any other ref we can use but we have to detect that at output of detector ckt we care getting input sinewave . for example we use comparator to detect some signals by using a dc ref when the signal goes high then comp output goes high and vice versa

Sig varies over a wider Freq range. How much latency from the time it falls
into the range 10 Khz to 800 Khz to detection can you tolerate ?

A simple freq cntr solution with code can solve this. And an amp to get
signal into logic levels range.

Regards, Dana

On the OCT device on the pictures we have an optical input, we expect an electrical output (Measuring an RF signal ~0.1V with frequencies around 10-800 kHz), a power supply (+-12V), maybe some digital control and maybe another electrical signal as a measurement reference (a SINE wave ~0.5V with frequency 500kHz).
how to find the signals can you help me ?

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A bandpass filter, whose center frequency is adjustable? And with high Q so that it amplifies that particular frequency.

Actually some how we need to detect the input signal by using these reference or any other ref we can use but we have to detect that at output of detector ckt we care getting input sinewave
Far from an actual specification, unfortunately.

The role of the 500k reference is still unclear. Is there an yet untold relation to the input signal, e.g. a set of fractional frequency ratios? "care getting input sine wave" also needs explanation. Should we read it as spectral criterion? If so, does it actually address signal waveform or stationary fundamental frequency, which can be e.g. met by a 10 kHz square wave?

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