Amplification circuit for electronic tone generator
AssigneeIndustrial Technology Research Institute
InventorShyuh-Der Lin
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Abstract
A shaped waveform tone generator circuit is contained entirely in an integrated circuit and has a pair of push-pull amplifiers for driving a piezo-buzzer. The output from an RC network controls current flow in a first follower transistor connected to one voltage source and in a second follower transistor connected to a second voltage source. A pair of CMOS switches alternately connect the inputs of the amplifiers to the first and second transistors. A tone signal controls operation of the two CMOS switches.
Claims7
In an electronic tone generator, first and second source follower transistors connected, respectively, to two different voltage sources, means including an RC network for producing waveform shaped currents in said follower transistors, first and second switch means, first and second amplifiers having inputs and outputs, a piezo-buzzer connected to the outputs of said amplifiers, said first switch means being capable of alternately connecting the input of said first amplifier to said first follower transistor and to said second follower transistor, said second switch means being capable of alternately connecting the input of said second amplifier to said first follower transistor and to second follower transistor, and means for imparting a tone signal to said first and second switch means.
Dependencies are inferred from the claim text.