How to match crystal filters to 50 ohm in input and output?

[7rots51]

what is the MAX input power for 45MHZ crystal filters?(I can not find data in datasheets)

How to match crystal filters to 50 ohm in input and output? Is there any good application note or schematic on net?

 

[VSWR]

Re: crystal filters

what is the MAX input power for 45MHZ crystal filters?(I can not find data in datasheets)

Typically max -10 dBm, see

**broken link removed**

How to match crystal filters to 50 ohm in input and output? Is there any good application note or schematic on net?

Same answer as already given to you here:

 

[7rots51]

Re: crystal filters

how we can protect crystal filter in reciever circuit against more than -10dbm power input?

How to prevent damaging it?

 

[leftyretro]

Re: crystal filters

how we can protect crystal filter in reciever circuit against more than -10dbm power input?

How to prevent damaging it?

Modern receiver design has to look at all receiver's 'stages' and components to define which will to the limiting stage for 'blocking' or non-linear response to a given maximum receiver input specification. There will always be some limit somewhere in a receiver's design and that is what will establish part (along with it's noise floor spec) the reciever's dynamic range specification, correct? An AGC circuit controling an input attenuator can be useful in some receiver designs to deal with some component limits such as IF filters, detectors, mixer's, etc.

Lefty

 

[7rots51]

Re: crystal filters

If more than -10dbm ~ +5dbm was applied to crystal filter what will be happened?will it be damaged or its characteristic will change permanently?

if more than +5 dBm applied what is hapened?

 

[spide]

Re: crystal filters

common pratice is to put a back to back diode b4 the input matching of the crystal filter, that should limit ur input power to about few dBm.