Analog-digital pulse width modulator (ADPWM)

摘要

Analog-to-digital pulse width modulation circuitry includes thermometer code generator circuitry, clock generator circuitry, delay selection circuitry, and an output stage. The thermometer code generator circuitry is adapted to generate a digital thermometer code based upon a received analog input voltage. The clock generator circuitry is adapted to generate a reference clock and a plurality of delayed clock signals. The delay selection circuitry is connected between the thermometer code generator circuitry and the clock generator circuitry, and is adapted to select one of the delayed clock signals to present to the output stage based upon the generated thermometer code. The selected delayed clock signal is delayed by an amount of time that is proportional to the generated thermometer code. The reference clock signal and the selected delayed clock signal are delivered to the output stage where they are used to generate a pulse width modulated output signal.

主权项

1. Pulse width modulation circuitry comprising:
thermometer code generator circuitry configured to produce a digital thermometer output code corresponding to a received analog input voltage; clock generator circuitry configured to generate a reference clock signal and a plurality of delayed clock signals; delay selection circuitry configured to select a delayed clock signal from the plurality of delayed clock signals based on the digital thermometer output code; and an output stage configured to generate a pulse width modulated output signal based upon the reference clock signal and the selected delayed clock signal.