Telephone ringing signal generator

Details Telephone ringing signal generator Telephone ringing signal generator

H - Electricity

04

M

H04M 3/02 (2006.01) H02M 5/297 (2006.01) H04M 19/02 (2006.01)

Patent

CA 2101842

2101842 9311624 PCTABS00022 A frequency conversion circuit includes four analog switching elements (46, 48, 52, 54) coupled. Each switching element is logic controlled to open or close, i.e., to have either a high or low conductivity to pass or block analog currents of either polarity. Effectively, a signal received on the dual input (40, 42) may be enabled in inverted or non-inverted form onto the dual output (60, 62), depending on the control of the switches. The circuit may be used for producing a telephone ringing signal from an AC input signal. The circuit is coupled to receive an AC input signal, such as a 60 Hz signal derived from AC line power. The switching elements are alternately opened and closed during a predetermined sequence of half-cycles of the AC input signal. The circuit produces an output signal having a sequence of consecutive positive half-cycles and a sequence of consecutive negative half-cycles. Each switching element preferably includes a MOSFET switch stage providing either high or low impedance between two switch electrodes, a current amplifier (76, 78) for providing a gate voltage to the MOSFET switch stage, and a storage circuit including a capacitor (102) for storing energy while the switching element is open.

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