Ambient light sensing module with signal generation function

An ambient light sensing module with a signal generation function, comprising:

• at least a fuse, determining a processing parameter;
• an optical sensing unit, sensing a light source and producing a light-sensing signal;
• a signal processing circuit, coupled to said optical sensing unit, and processing said light-sensing signal according to said processing parameter for producing a pulse-width modulation signal acting as an output signal;
• and
• an adjusting unit, producing an adjusting signal according to said output signal and the intensity of said light source;
• where a trimming unit trims said fuse according to said adjusting signal for modifying said processing parameter, and said signal processing circuit comprises a sawtooth signal generating circuit for producing a sawtooth signal, said sawtooth signal is utilized to produce said pulse-width modulation signal, said sawtooth signal generating circuit comprises a generator for producing said sawtooth signal, said generator comprises:
• a storage capacitor, used for producing a driving voltage;
• a charging current source, producing a first charging current for charging said storage capacitor and producing said driving voltage;
• a discharging current source, producing a discharging current for discharging said storage capacitor;
• a first switch, coupled to said storage capacitor, controlled by said driving voltage, and producing a reference current;
• a current mirror, producing a second charging current according to said reference current;
• an output capacitor, coupled to said current mirror, producing said sawtooth signal, and said second charging current charging said output capacitor for producing said sawtooth signal;
• a second switch, coupled between said output capacitor and the ground for discharging said output capacitor;
• a delay unit, delaying an input signal for producing a delay signal;
• and
• a logic unit, producing a control signal according to said input signal and said delay signal for controlling said second switch;
• where a phase/frequency detector controls said charging current source and said discharging current source according to a phase of said input signal and a phase of a pulse signal.

An ambient light sensing module with a signal generation function, comprising:

• at least a fuse, determining a processing parameter;
• an optical sensing unit, sensing a light source and producing a light-sensing signal;
• a signal processing circuit, coupled to said optical sensing unit, and processing said light-sensing signal according to said processing parameter for outputting an output signal, said signal processing circuit comprising an analog-to-digital converting unit, said analog-to-digital converting unit receiving said light-sensing signal and converting said light-sensing signal to a digital signal acting as said output signal according to said processing parameter;
• and
• an adjusting unit, producing a plurality of testing parameters according to said output signal and the intensity of said light source;
• where said signal processing circuit processes said light-sensing signal according to said plurality of testing parameters, respectively, and produces a plurality of reference signals;
• said adjusting unit produces an adjusting signal according to said plurality of reference signals and the intensity of said light source;
• and a trimming unit trims said fuse according to said adjusting signal for modifying said processing parameter;
• said analog-to-digital converting unit comprises:
• an integration circuit, integrating said light-sensing signal for producing an integration signal;
• a supplying unit, providing a reference voltage according to said processing parameter;
• a reference signal generating circuit, producing a plurality of reference signals sequentially according to said reference voltage;
• a comparing unit, receiving said integration signal and said plurality of reference signals, and comparing said integration signal with said plurality of reference signals sequentially for producing a plurality of comparing signals sequentially;
• a first counting circuit, receiving said plurality of comparing signals, and counting said plurality of comparing signals for producing a first counting signal used for producing a reset signal and resetting said integrating circuit and said first counting circuit;
• a second counting circuit, coupled to said first counting circuit for counting the number of said reset signal and producing a second counting signal;
• and
• a latch circuit, receiving said first counting signal and said second counting signal for producing said digital signal.

An ambient light sensing module with a signal generation function, comprising:

• at least a fuse, determining a processing parameter;
• an optical sensing unit, sensing a light source and producing a light-sensing signal;
• a signal processing circuit, coupled to said optical sensing unit, and processing said light-sensing signal according to said processing parameter for outputting an output signal, wherein said signal processing circuit comprises an analog-to-digital converting unit, receiving said light-sensing signal, and converting said light-sensing signal to a digital signal acting as said output signal according to said processing parameter;
• and
• an adjusting unit, producing a plurality of testing parameters according to said output signal and the intensity of said light source;
• where said signal processing circuit processes said light-sensing signal according to said plurality of testing parameters, respectively, and produces a plurality of reference signals;
• said adjusting unit produces an adjusting signal according to said plurality of reference signals and the intensity of said light source;
• and a trimming unit trims said fuse according to said adjusting signal for modifying said processing parameter;
• said analog-to-digital converting unit comprises:
• an integration circuit, integrating said light-sensing signal for producing a first integration signal, and integrating a baseline signal for producing a second integration signal;
• a supplying unit, providing a reference voltage according to said processing parameter;
• a reference signal generating circuit, producing a plurality of reference signals sequentially according to said reference voltage;
• a comparing unit, comparing a difference value between said first integration signal and said second integration signal with said plurality of reference signals sequentially for producing a plurality of comparing signals sequentially;
• a first counting circuit, receiving said plurality of comparing signals, and counting said plurality of comparing signals for producing a first counting signal used for producing a reset signal and resetting said integrating circuit and said first counting circuit;
• a second counting circuit, coupled to said first counting circuit for counting the number of said reset signal and producing a second counting signal;
• and
• a latch circuit, receiving said first counting signal and said second counting signal for producing said digital signal.

An ambient light sensing module with a signal generation function, comprising:

• at least a fuse, determining a processing parameter;
• an optical sensing unit, sensing a light source and producing a light-sensing signal;
• a signal processing circuit, coupled to said optical sensing unit, and processing said light-sensing signal according to said processing parameter for outputting an output signal, wherein said signal processing circuit comprises:
• an analog-to-digital converting unit, receiving said light-sensing signal, and converting said light-sensing signal to a digital signal according to said processing parameter;
• and
• a digital-to-analog converting unit, receiving said digital signal, and converting said digital signal to an analog signal acting as said output signal;
• an adjusting unit, producing a plurality of testing parameters according to said output signal and the intensity of said light source;
• where said signal processing circuit processes said light-sensing signal according to said plurality of testing parameters, respectively, and produces a plurality of reference signals;
• said adjusting unit produces an adjusting signal according to said plurality of reference signals and the intensity of said light source;
• and a trimming unit trims said fuse according to said adjusting signal for modifying said processing parameter;
• said analog-to-digital converting unit comprises:
• an integration circuit, integrating said light-sensing signal for producing an integration signal;
• a supplying unit, providing a reference voltage according to said processing parameter;
• a reference signal generating circuit, producing a plurality of reference signals sequentially according to said reference voltage;
• a comparing unit, receiving said integration signal and said plurality of reference signals, and comparing said integration signal with said plurality of reference signals sequentially for producing a plurality of comparing signals sequentially;
• a first counting circuit, receiving said plurality of comparing signals, and counting said plurality of comparing signals for producing a first counting signal used for producing a reset signal and resetting said integrating circuit and said first counting circuit;
• a second counting circuit, coupled to said first counting circuit for counting the number of said reset signal and producing a second counting signal;
• and
• a latch circuit, receiving said first counting signal and said second counting signal for producing said digital signal.

An ambient light sensing module with a signal generation function, comprising:

• at least a fuse, determining a processing parameter;
• an optical sensing unit, sensing a light source and producing a light-sensing signal;
• a signal processing circuit, coupled to said optical sensing unit, and processing said light-sensing signal according to said processing parameter for outputting an output signal, wherein said signal processing circuit comprises:
• an analog-to-digital converting unit, receiving said light-sensing signal, and converting said light-sensing signal to a digital signal according to said processing parameter;
• and
• a digital-to-analog converting unit, receiving said digital signal, and converting said digital signal to an analog signal for producing said output signal;
• an adjusting unit, producing a plurality of testing parameters according to said output signal and the intensity of said light source;
• where said signal processing circuit processes said light-sensing signal according to said plurality of testing parameters, respectively, and produces a plurality of reference signals;
• said adjusting unit produces an adjusting signal according to said plurality of reference signals and the intensity of said light source;
• and a trimming unit trims said fuse according to said adjusting signal for modifying said processing parameter, said analog-to-digital converting unit comprises:
• an integration circuit, integrating said light-sensing signal for producing a first integration signal, and integrating a baseline signal for producing a second integration signal;
• a supplying unit, providing a reference voltage according to said processing parameter;
• a reference signal generating circuit, producing a plurality of reference signals sequentially according to said reference voltage;
• a comparing unit, comparing a difference value between said first integration signal and said second integration signal with said plurality of reference signals sequentially for producing a plurality of comparing signals sequentially;
• a first counting circuit, receiving said plurality of comparing signals, and counting said plurality of comparing signals for producing a first counting signal used for producing a reset signal and resetting said integrating circuit and said first counting circuit;
• a second counting circuit, coupled to said first counting circuit for counting the number of said reset signal and producing a second counting signal;
• and
• a latch circuit, receiving said first counting signal and said second counting signal for producing said digital signal.