Filter with reduced element ratings and method

Details Filter with reduced element ratings and method Filter with reduced element ratings and method

1995-01-30

1996-11-05

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327103, 327350, 327557, 327559, G06F 7556

Patent

active

055721621

ABSTRACT:
An electronic filter for passing predetermined frequencies includes resistive and capacitive components that need not be rated to handle the input voltage. An input signal is converted to a second signal that is proportional to the logarithm of the input signal (and therefore of much smaller magnitude than the input signal), and then low, high, bandpass filtered with an RC filter. The filtered signal is reconverted to an output signal that is proportional to the inverse logarithm of the filtered signal. The filter may be embedded in a current mirror that may be used in telephone system subscriber line interface circuit.

REFERENCES:
patent: 4430626 (1984-02-01), Adams
patent: 5126586 (1992-06-01), Gilbert
patent: 5338985 (1994-08-01), Fotowat-Ahmady et al.
patent: 5394025 (1995-02-01), Pierson

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