made without the oscillator by direct measurement of the filter response application_number US 50077890 A description the present invention is a programmable integrated circuit high frequency continuous time filter in the following description numerous specific details are set forth to provide a more thorough description of the present invention it will be apparent however to one skilled in the art that the present invention may be practiced without these specific details in other instances well known features have not been described in detail so as not to obscure the present invention in the prior art filters are built of gm amplifiers and a capacitor to make an rc time constant because the resistance is variable the prior art attempts to create an accurate filter utilizing an external equivalent resistance which can be made accurate however to make an accurate filter both r and c have to be accurate the prior art has the disadvantage of an unknown capacitance the present invention effectively corrects the circuit for a c value by running an oscillator in connection with the capacitor the frequency is checked and by tuning the resistance and trimming a ratio current the frequency can be tuned the gain of the current is trimmed once the resistor is trimmed to the right frequency the reference oscillator is depowered the present invention may be used in applications such as disk drive read channels where signal levels are very low therefore by eliminating interference signal reading difficulties are reduced.