Integrated sine wave generating circuit

Details Integrated sine wave generating circuit Integrated sine wave generating circuit

H - Electricity

03

B

H03B 1/02 (2006.01) H01Q 23/00 (2006.01) H03L 3/00 (2006.01) H03L 5/00 (2006.01) H04B 1/18 (2006.01)

Patent

CA 2353003

The invention relates to an integrated high power sine wave carrier circuit for outputting a low distortion high power sine wave. The circuit is used for antennas, and especially for antennas in automotive appliances. The circuit comprises a H-bridge (2) with matched power transistors (4, 6, 8, 10), a sine generator (24) for driving the H-bridge and a regulator (22) for sensing the power applied to the antenna and controlling the current amplitude of the sine wave output by the sine generator. The circuit operates under partial time- working, whereby the integration circuit is turned on or off. The circuit therefore comprises a shutdown pin, for shutting the circuit down in order to allow cooling. The partial time operation allows the circuit to be integrated on a single die.

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