A ramp generator includes a current generator, a current mirror, and a first capacitor. The current generator has an input for receiving a clock signal, and an output for providing a current proportional to a frequency of the clock signal using a first transistor having first and second current electrodes and a control electrode, an amplifier that establishes a reference voltage on the second current electrode of the first transistor, and a variable resistor coupled between the second current electrode of the second transistor and ground whose resistance is set according to the frequency of the clock signal. The current mirror has an input coupled to the first terminal of the first transistor, and a second terminal. The first capacitor has a first terminal coupled to the output of the current mirror and providing a ramp signal, and a second terminal coupled to the first power supply voltage terminal.

Apparatuses and methods for image sensors with increased analog to digital conversion range are described herein. An example method may include disabling a first auto-zero switch of a comparator, the first auto-zero switch coupled to a ramp voltage input of the comparator, increasing, by a ramp generator, an auto-zero voltage level of a ramp voltage provided to the ramp voltage input of the comparator, and disabling a second auto-zero switch of the comparator, the second auto-zero switch coupled to a bitline input of the comparator.

A digitally controlled oscillator (100), a synthesizer module (200), a synthesizer (300), and a method for producing an electrical audio signal are presented. The oscillator (100) comprises a digital processing unit (10) configured to generate a first pulse wave at a first output (PulseUp) of the processing unit (10), wherein the first pulse wave is arranged to include pulses at at least two different frequencies. The oscillator (100) further comprises a summing circuit (30) and a linear wave shaper (20). The output (PulseUp) of the processing unit (10) is connected to the summing circuit (30) which is arranged to produce a resultant signal based on at least the first pulse wave. The resultant signal is arranged to be fed into the linear wave shaper (20) which is arranged to produce an output signal at the output (OUT) of the oscillator (100) based on modifying the resultant signal.

A digitally controlled oscillator (100), a synthesizer module (200), a synthesizer (300), and a method for producing an electrical audio signal are presented. The oscillator (100) comprises a digital processing unit (10) configured to generate a first pulse wave at a first output (PulseUp) of the processing unit (10), wherein the first pulse wave is arranged to include pulses at at least two different frequencies. The oscillator (100) further comprises a summing circuit (30) and a linear wave shaper (20). The output (PulseUp) of the processing unit (10) is connected to the summing circuit (30) which is arranged to produce a resultant signal based on at least the first pulse wave. The resultant signal is arranged to be fed into the linear wave shaper (20) which is arranged to produce an output signal at the output (OUT) of the oscillator (100) based on modifying the resultant signal.

A ramp generator includes an operational amplifier having an output to generate a ramp signal. An integration current source is coupled to a first input and a reference voltage is coupled to a second input of the operational amplifier. A feedback capacitor and a reset switch are coupled between the first input and the output of the operational amplifier. The reset switch is turned on to reset the ramp generator. A ramp event is configured to be generated in the ramp signal at the output of the operational amplifier in response to the reset switch being turned off. An assist current source is coupled between the output of the operational amplifier and ground. The assist current source is configured to conduct an assist current from the output of the operational amplifier to ground in response to the reset switch being turned off.

A ramp generator includes an operational amplifier having an output to generate a ramp signal. An integration current source is coupled to a first input and a reference voltage is coupled to a second input of the operational amplifier. A feedback capacitor and a reset switch are coupled between the first input and the output of the operational amplifier. The reset switch is turned on to reset the ramp generator. A ramp event is configured to be generated in the ramp signal at the output of the operational amplifier in response to the reset switch being turned off. An assist current source is coupled between the output of the operational amplifier and ground. The assist current source is configured to conduct an assist current from the output of the operational amplifier to ground in response to the reset switch being turned off.

The present disclosure provides an oscillating circuit and an electronic device; the oscillating circuit includes a capacitor charging and discharging circuit unit, a voltage comparison circuit unit and a threshold voltage generation circuit unit; the oscillating circuit uses the capacitor charging and discharging and the hysteresis effect of the capacitor charging and discharging circuit unit to achieve oscillation based on the negative feedback regulation constituted by the voltage comparison circuit unit and the threshold voltage generation circuit unit, which is different from the traditional oscillating circuit based on capacitance and inductance; the oscillating circuit does not adopts inductors, has relatively low power consumption, and outputs oscillation signals with frequencies that vary with currents, and when the oscillating circuit is used to provide clock signals for the sensor, it can be integrated with a sensor signal processing circuit to realize the miniaturization and integration of the sensor system.

The present disclosure provides an oscillating circuit and an electronic device; the oscillating circuit includes a capacitor charging and discharging circuit unit, a voltage comparison circuit unit and a threshold voltage generation circuit unit; the oscillating circuit uses the capacitor charging and discharging and the hysteresis effect of the capacitor charging and discharging circuit unit to achieve oscillation based on the negative feedback regulation constituted by the voltage comparison circuit unit and the threshold voltage generation circuit unit, which is different from the traditional oscillating circuit based on capacitance and inductance; the oscillating circuit does not adopts inductors, has relatively low power consumption, and outputs oscillation signals with frequencies that vary with currents, and when the oscillating circuit is used to provide clock signals for the sensor, it can be integrated with a sensor signal processing circuit to realize the miniaturization and integration of the sensor system.

The present disclosure provides an oscillating circuit and an electronic device; the oscillating circuit includes a capacitor charging and discharging circuit unit, a voltage comparison circuit unit and a threshold voltage generation circuit unit; the oscillating circuit uses the capacitor charging and discharging and the hysteresis effect of the capacitor charging and discharging circuit unit to achieve oscillation based on the negative feedback regulation constituted by the voltage comparison circuit unit and the threshold voltage generation circuit unit, which is different from the traditional oscillating circuit based on capacitance and inductance; the oscillating circuit does not adopts inductors, has relatively low power consumption, and outputs oscillation signals with frequencies that vary with currents., and when the oscillating circuit is used to provide clock signals for the sensor, it can be integrated with a sensor signal processing circuit to realize the miniaturization and integration of the sensor system.

The present disclosure provides an oscillating circuit and an electronic device; the oscillating circuit includes a capacitor charging and discharging circuit unit, a voltage comparison circuit unit and a threshold voltage generation circuit unit; the oscillating circuit uses the capacitor charging and discharging and the hysteresis effect of the capacitor charging and discharging circuit unit to achieve oscillation based on the negative feedback regulation constituted by the voltage comparison circuit unit and the threshold voltage generation circuit unit, which is different from the traditional oscillating circuit based on capacitance and inductance; the oscillating circuit does not adopts inductors, has relatively low power consumption, and outputs oscillation signals with frequencies that vary with currents., and when the oscillating circuit is used to provide clock signals for the sensor, it can be integrated with a sensor signal processing circuit to realize the miniaturization and integration of the sensor system.