BPF configuration - how to calculate top c coupled filter

[disisku_22]

how to calculate top c coupled filter

Dear all,
Refer to the attached fig... I feel this is transformer coupled 545MHz BPF, can any one knows what type of configuration is this and how to Design/calculate the component values for attached filter or any Literature on this type of filter will helps lot.

thanks
roshni.

 

[disisku_22]

top c coupled

pls help me on this.....

 

[LvW]

Re: BPF configuration

Dear all,
Refer to the attached fig... I feel this is transformer coupled 545MHz BPF, can any one knows what type of configuration is this and how to Design/calculate the component values for attached filter or any Literature on this type of filter will helps lot.
thanks
roshni.

I don´t think that the inductances are coupled to each other (no transformer).
Furtherone, I suppose that the filter function is established in conjunction with input/output resistances which are not shown. Have you information about input/output circuitry ?
Is the line shown in the upper part a power line ?

 

[disisku_22]

Re: BPF configuration

HI lvW,
i/p of BPF connected to transistor o/p and o/p of BPF connected to 50Ohm SMA connector. upper line is Vcc line and bottom line is Gnd. pls find the attached sch for further details(this is 514MHz PBF).



thanks
roshni

 

[disisku_22]

Re: BPF configuration

Dear
Abhishekabs, VSWR, biff44 , kspalla, vfone

I need your expertise to analyze this filter, any feed back... i simulated this ckt in MWO with the specified value, it is giving good attenuation in stop band then top C coupled band pass filter..

thanks
roshni

 

[kspalla]

BPF configuration

I guess it is as oscillator design than BPF?

Guys what do you say?

disisku_22, please share the complete design.

 

[disisku_22]

Re: BPF configuration

yes, you are right this is oscillator design and the o/p of transistor is BPF and act as multiplier circuits(X3).
i guess this BPF configuration is equivalent ckt of transformer coupled design(ref attached fig) , i need help on calculating these components values.

thanks
roshni

 

[kspalla]

BPF configuration

Simple.
Put the circuit in simulator and optimize the Caps.

 

[disisku_22]

Re: BPF configuration

thanks... simulation will give the results, but i am more enthusiastic on knowing the theoretical calculation.

any more suggestion......

thanks
roshni

 

[biff44]

Re: BPF configuration

Is that inductor to the 3 volt rail really only 1.5 nh? Sure it is not 1.5 uH?

 

[disisku_22]

Re: BPF configuration

yes, it is 1.5NH. but 0.5NH will also works fine.

roshni