Filter designs utilizing parasitic and field effects
AssigneeAmerAmp, LLC
InventorAugusto Arevalo
Life of this patent
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Abstract
A method for designing a filtering device essentially comprising the steps of determining a desired response of the filtering device at a selected frequency; and selecting a circuit element that exhibits a parasitic effect at the selected frequency, wherein the parasitic effect results in the circuit element having the desired response at the selected frequency. A second method for designing a filtering device, similar to the first, but utilizes a field effect at the selected frequency, instead of a parasitic effect. A frequency converter comprising a notch filter which filters a first frequency and does not filter a second frequency. The notch filter comprises a lumped parameter element and a transmission line, wherein the transmission line is coupled to the lumped parameter element.
Claims10
A filtering device comprising a circuit element, wherein the circuit element exhibits a field effect at a selected frequency, wherein the field effect produces a desired response at the selected frequency, wherein the filtering device is designed, at least in part, to utilize the field effect to achieve the desired response at the selected frequency, wherein the desired response at the selected frequency is that of a notch filter which filters the selected frequency, wherein the circuit element comprises a transmission line having a front end and having a tail end, and wherein the transmission line's length is chosen so as to produce a partial cancellation of the selected frequency, wherein the desired response that the field effect produces is an enhancement in the cancellation of the selected frequency, and wherein the field effect is utilized by designing the filtering device such that the tail end of the transmission line is sufficiently close to the front end of the transmission line to achieve the desired cancellation.
A method for selecting a circuit element for a filtering device comprising the steps of:
- sweeping a circuit element across a pre-selected range of frequencies;
- recording various field effects of the circuit element within the range of frequencies;
- and
- selecting the circuit element, for use in the circuit filtering device, that exhibits a field effect at the selected frequency, wherein the field effect results in the circuit element having a response that deviates from a pre-specified response for the circuit element at the selected frequency, and wherein the circuit element is selected for use in the filtering device, at least in part, in order to utilize the field effect at the selected frequency.
A method for selecting a circuit element for a filtering device comprising the steps of:
- sweeping a circuit element across a pre-selected range of frequencies;
- recording various parasitic effects of the circuit element within the pre-selected range of frequencies;
- and
- selecting the circuit element, for use in the filtering device, that exhibits a parasitic effect at a selected frequency, wherein the parasitic effect results in the circuit element having a response that deviates from a pre-specified response for the circuit element at the selected frequency, and wherein the circuit element is selected for use in the filtering device, at least in part, in order to utilize the parasitic effect at the selected frequency.
A computer readable medium containing program instructions for an information processing apparatus for designing a circuit filtering device, the program instructions comprising instructions for:
- selecting a frequency range to sweep;
- sweeping a circuit element across the frequency range;
- recording various parasitic effects of the circuit element within the frequency range of determining a desired response of the filtering device at the selected frequency within the range;
- and
- selecting the circuit element, for use in the circuit filtering device, that exhibits a parasitic effect at the selected frequency, wherein the parasitic effect results in the circuit element having a response that deviates from a pre-specified response for the circuit element at the selected frequency, and wherein the circuit element is selected for use in the filtering device, at least in part, in order to utilize the parasitic effect at the selected frequency.
A computer readable medium containing program instructions for an information processing apparatus for designing a circuit filtering device, the program instructions comprising instructions for:
- selecting a frequency range to sweep;
- sweeping a circuit element across the frequency range;
- recording various field effects of the circuit element within the frequency range of determining a desired response of the filtering device at the selected frequency within the range;
- and
- selecting the circuit element, for use in the circuit filtering device, that exhibits a field effect at the selected frequency, wherein the field effect results in the circuit element having a response that deviates from a pre-specified response for the circuit element at the selected frequency, and wherein the circuit element is selected for use in the filtering device, at least in part, in order to utilize the field effect at the selected frequency.
A frequency converter comprising a first notch filter which filters a first frequency and does not filter a second frequency, wherein the first notch filter comprises:
- a lumped parameter element having a first terminal and a second terminal, and having a frequency characteristic such that a first frequency is not filtered by the lumped parameter element and a second frequency is filtered by the lumped parameter element and therefore does not pass through it;
- and
- a transmission line comprising a first end and a second end, wherein the first end is coupled to the second terminal, and wherein the transmission line has a length chosen to produce a partial cancellation of the selected frequency, and wherein the desired response that the field effect produces is an enhancement in cancellation of the second frequency, and wherein the field effect is utilized by designing the notch filter such that the tail end of the transmission line is sufficiently close to the front end of the transmission line to achieve the desired cancellation.
Dependencies are inferred from the claim text.