| 摘要 |
A pulse width modulator ( 100 ) and method that facilitates high resolution pulse width modulation is provided. The pulse width modulator ( 100 ) creates a pulse width modulated signal having a duty cycle that is proportional to a controllable delay in the modulator. The pulse width modulator combines a first digitally controllable delay ( 102 ) with a delay adjustment ( 104 ) to provide the controllable delay. In one embodiment, a digital counter ( 202 ) is used to provide coarse delay, with the delay adjustment device ( 210 ) coupled to the digital counter ( 202 ) to provide the fine, high resolution, delay control. Together the digital counter ( 202 ) and delay adjustment device ( 210 ) provide high resolution pulse width modulation. In one particular implementation, the analog delay adjustment device ( 100 ) comprises a delay block ( 500 ) designed to provide delay adjustment that is selectively controllable by changing a capacitance in the device.
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