Patent ID: 7288977
Filing Date: 2007-10-30
Classification: H03K

Abstract:
1. A pulse width modulator, the pulse width modulator comprising: a first delay device, the first delay device adapted to create a first delay; a delay adjustment device, the delay adjustment device adapted to create a second delay, wherein the delay adjustment device comprises a delay block, and wherein the delay block includes a first capacitor and a variable capacitor having a variable capacitance, and wherein the delay block is adapted to store a first voltage on the first capacitor, and wherein the delay block is adapted to determine the second delay by controllably varying the variable capacitance, charging the variable capacitor to a second voltage and comparing the second voltage on the variable capacitor to the first voltage on the first capacitor such that the second delay is determined at least in part by the controllably varied variable capacitance; a signal generating device coupled to the first delay device and the delay adjustment device, the signal generating device adapted to create a pulse width modulated signal having a duty cycle responsive to a combination of the first delay and the second delay.