MSP430FG437: Narrow pulse detect

Burak Güvelioglu

Part Number: MSP430FG437

Hi,

We use a SI PIN diode. We want to detect the incoming signal using a transempedance amplifier. The incoming signal is a pulse. The pulse width is 10 ns.

1)Would you recommend an amplifier to detect this narrow pulse? What parameters of the amplifier we will use are important?

2)I want to use the amplifier in MCU.. Would the amplifiers in the MSP430FG437 be sufficient for this?
If not enough, what else can I use instead?

The representative pulse is shown in the figure.

over 4 years ago

0 Tomas Jira over 4 years ago

Prodigy 60 points

What is the peak amplitude and source impedance? What is the maximum fequency?

0 Burak Güvelioglu over 4 years ago in reply to Tomas Jira

Prodigy 80 points

The peak amplitude is around 100 mV. The source impedance is 50 ohms. The maximum frequency is 100Mhz.

0 Tomas Jira over 4 years ago in reply to Burak Güvelioglu

Prodigy 60 points

Well, that seems more like a FPGA job. No micro I am aware of, especially clocked at <20MHz, can fire interrupts at 100MHz pace.

If the maximum frequency was <1MHz, then it should have been easy, using just use a single stage HF transistor amplifier and then a 74AC123 monostable mutlivibrator to lenghten the pulse.

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MSP430FG437: Narrow pulse detect