Telephone line circuit

Details Telephone line circuit Telephone line circuit

H - Electricity

04

B

379/67

H04B 3/06 (2006.01)

Patent

CA 1117232

ABSTRACT OF THE DISCLOSURE The present invention is an amplifier circuit having gain which is different for different signals applied to each of its inputs. The circuit is comprised of a differential operational amplifier having an inverting and a noninverting input, and an output, a feedback resistor (R1) connected between the output and inverting input, a first signal source having its output connected to the noninverting input, a buffer amplifier having its input connected to the first signal source, a second signal source having its output connected to the output of the buffer amplifier and through an input resistor (R2) to the inverting input of the differential operational amplifier, and a bypass resistor (R3) connected from said inverting input to ground, whereby the gain provided by said amplifier circuit to a signal from the first signal source is given by the expression Image and the gain provided by said amplifier circuit to a signal from the second signal source is given by the expression Image , where R1, R2, and R3 are reistance values in ohms.

371449

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