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RF analog AC switch search - RF Cafe Forums

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 Post subject: RF analog AC switch search
Posted: Tue Nov 01, 2011 11:04 am 

Joined: Tue Nov 01, 2011 10:03 am

Posts: 2

Location: Israel

Hi to all,

first of all great forum i never heard about before

i'm looking for RF ac switch w next specificatin (a bit flexible):

i would be glad if someone will be able to help me find such

- Operation frequencies: 0-20MHz


- Application: pass around 6W in Lo freq, block around 10mW in Hi freq

- Close/on state (when around 3Vdc applied to the switch controls):

Can pass 6Watt, 25Vac peak2peak @ < 0.5MHz (signal freq)

- Rds on: up to 200mOhm when switch is on state for minimal loss

- Open/off state (when no power applied to the switch):

Can block 25Vac peak2peak @ above 10MHz signal , w isolation around 20dB

as if Hi freq signal sees 10Kohm resister.

- Low profile: SMT part, preferably around 1mm height

- Target price: up to 2$ per unit

- i emphasise that there isn't DC supply i'm plannig to use the ac Lo freq 25Vac peak to peak for the control signal by using a bridge or a diode.and when Hi freq is in the source i plan to use no DC power at all.

i'm looking for such a long time w no sucsses :-( would be glad if someone could advice me or even declare that there is no solution



Thanks & BR


 Post subject: Re: RF analog AC switch search
Posted: Wed Nov 02, 2011 10:25 am 

Joined: Tue Nov 01, 2011 10:03 am

Posts: 2

Location: Israel


Some other than IC solutions may be consider such as

an ac switch made of back to back FETs

or antiserial L T topologies though w suitable FETs to block above 10MHZ signal

i.e. some GaAa transistors

Or PIN diode, etc

i would be glad to your advice

Posted  11/12/2012

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