5MHz signal to DC converter circuit needed

[SUMNERE]

I'm looking for a non-complex way to convert a 5MHZ signal to a dc level with
little if any ripple. The signal is at 5MHz with amplitude of 0-5 volts. When
the signal is present a + 2.5 to +5 Vdc output is required. When the 5MHz
signal disappears a 0 volt output is required.

Any ideas? Thanks

 

[chris welsh]

How about some type of F to V converter (or even a rectifier) that drives a
voltage comparator?

 

[Robert C Monsen]

I'm looking for a non-complex way to convert a 5MHZ signal to a dc level with
little if any ripple. The signal is at 5MHz with amplitude of 0-5 volts. When
the signal is present a + 2.5 to +5 Vdc output is required. When the 5MHz
signal disappears a 0 volt output is required.

Any ideas? Thanks

How about a low pass filter?

Regards,
Bob Monsen

 

[Bob Masta]

I'm looking for a non-complex way to convert a 5MHZ signal to a dc level with
little if any ripple. The signal is at 5MHz with amplitude of 0-5 volts. When
the signal is present a + 2.5 to +5 Vdc output is required. When the 5MHz
signal disappears a 0 volt output is required.

Any ideas? Thanks

You need only a series diode followed by a capacitor to ground, with
a shunt resistor. When the 5 MHz is present it will be rectified and
filtered to DC. When it goes away, the shunt resistor will drain the
capacitor back to zero. Bigger capacitor and/or resistor make for
less ripple on the DC, but longer response time. Note that you
need to consider the load resistance of whatever you connect to
the DC output, since it is part of the shunt.


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com

 

[Mark Fergerson]

I'm looking for a non-complex way to convert a 5MHZ signal to a dc level with
little if any ripple. The signal is at 5MHz with amplitude of 0-5 volts. When
the signal is present a + 2.5 to +5 Vdc output is required. When the 5MHz
signal disappears a 0 volt output is required.

Any ideas? Thanks

Sounds like a "signal strength meter". Google for that
and adjust parameters and parts as required.

Mark L. Fergerson