Radio frequency computer mouse
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Aug 10, 1999
filing date -
Aug 10, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A RF computer mouse has a track ball mechanism a control IC, and a simplified RF transmitter using ASK modulation for sending signal. The RF transmitter comprises a high-frequency transistor, an LC high frequency suppressing circuit, an emitter resistor, a surface acoustic wave device and an LC circuit with matched impedance with antenna. The simplified RF transmitter uses surface acoustic wave device as oscillator source and sends the signal of the control IC through the high-frequency transistor. The use of the surface acoustic wave device can simplify the RF transmitter circuit, thus eliminating calibration step, simplifying manufacture and enhancing yield.
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