Claims
- 1. A stop band second order active RC filter comprising a single operational amplifier (Op Amp) having an inverting input, a non-inverting input, and an output, wherein the Op Amp is configured to use only the inverting input to receive an input signal to provide a transfer function associated with the stop band second order active RC filter having an imaginary zero.
- 2. The stop band second order active RC filter according to claim 1 further comprising a plurality of filter elements including a plurality of resistors and a plurality of capacitors,wherein at least one predetermined filter element selected from among the plurality of resistors and plurality of capacitors is configured to provide a positive feedback path between the Op Amp output and the Op Amp inverting input, and further wherein at least one predetermined filter element selected from among the plurality of resistors and plurality of capacitors is configured to provide a negative feedback path between the Op Amp output and the Op Amp inverting input.
- 3. The stop band second order active RC filter according to claim 1 wherein the transfer function is defined by a relationship written as T(s)=k[B2·(s2)+1]A2·s2+A1·s+1,whereα=ReRe+R24,K=αR27R26,Re=(R26·R25)R26+R25,B2=C8·C7·R28·R26·1α,A2=(C8+Ct)·R27·R28,andA1=C7[R27+R28 (1+R27R29)].
- 4. A stop band second order active RC filter comprising:a single operational amplifier (Op Amp) having an inverting input, a non-inverting input, and an output, wherein the Op Amp is configured to use only the inverting input to receive an input signal to provide a transfer function associated with the stop band second order active RC filter having an imaginary zero; and a plurality of filter elements including a plurality of resistors and a plurality of capacitors, wherein at least one predetermined filter element selected from among the plurality of resistors and plurality of capacitors is configured to provide a positive feedback path between the Op Amp output and the Op Amp inverting input, and further wherein at least one predetermined filter element selected from among the plurality of resistors and plurality of capacitors is configured to provide a negative feedback path between the Op Amp output and the Op Amp inverting input.
- 5. The stop band second order active RC filter according to claim 4 wherein the transfer function is defined by a relationship written as T(s)=k[B2·(s2)+1]A2·s2+A1·s+1,whereα=ReRe+R24,K=αR27R26,Re=(R26·R25)R26+R25,B2=C8·C7·R28·R26·1α,A2=(C8+Ct)·R27·R28,andA1=C7[R27+R28 (1+R27R29)].
- 6. A stop band second order active RC filter comprising:a single operational amplifier (Op Amp) having an inverting input, a non-inverting input, and an output, wherein the Op Amp is configured to use only the inverting input to receive an input signal to provide a transfer function associated with the stop band second order active RC filter having an imaginary zero; and means for providing a positive feedback path between the Op Amp output and the Op Amp inverting input; and means for providing a negative feedback path between the Op Amp output and the Op Amp inverting input.
- 7. The stop band second order active RC filter according to claim 6 wherein the transfer function is defined by a relationship written as T(s)=k[B2·(s2)+1]A2·s2+A1·s+1,whereα=ReRe+R24,K=αR27R26,Re=(R26·R25)R26+R25,B2=C8·C7·R28·R26·1α,A2=(C8+Ct)·R27·R28,andA1=C7[R27+R28 (1+R27R29)].
- 8. The stop band second order active RC filter according to claim 6 wherein the means for providing a positive feedback path between the Op Amp output and the Op Amp inverting input comprises at least one capacitor.
- 9. The stop band second order active RC filter according to claim 6 wherein the means for providing a negative feedback path between the Op Amp output and the Op Amp inverting input comprises at least one resistor.
Parent Case Info
This application claims priority under 35 USC §119(e)(1) of provisional application Serial. No. 60/390,428, filed Jun. 19, 2002.
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Number |
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Mar 2001 |
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Provisional Applications (1)
|
Number |
Date |
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|
60/390428 |
Jun 2002 |
US |