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US 8,410,832 B2Granted
Method and apparatus for producing triangular waveform with low audio band content
AssigneeRGB Systems, Inc.
InventorEric Mendenhall
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Abstract
A triangular waveform generator includes a square waveform clock circuit and an integrating circuit. The integration circuit receives input from the square waveform clock circuit and generates a triangular waveform output. A feedback circuit is operatively connected to the integrating circuit to reduce the audio band noise content in the triangular waveform output. The feedback circuit acts as a DC balance without significant sacrifice in the linearity of the triangular waveform output.
Claims7
A method for generating a triangle wave signal using an electronic circuit, said method comprising the steps of:
- receiving from a square wave generation circuit a square wave signal having a pulse frequency higher than an audio frequency band and comprising a first level of noise in said audio frequency band;
- integrating said square wave signal using an integrating circuit to produce a triangle wave signal having a second level of noise in said audio frequency band;
- generating a feedback signal from said triangle wave signal by applying a transfer function comprising a plurality of poles to said triangle wave signal, wherein said transfer function has a first gain in said audio frequency band and a second gain at said pulse frequency, said first gain being greater than said second gain;
- combining said feedback signal with said square wave signal prior to integrating said square wave signal so as to reduce said second level of noise in said audio frequency band in said triangle wave signal.
1 more element
Dependencies are inferred from the claim text.