Methods and systems for improving touch sensitivity of touch-based devices

1. A method for improving touch detection of a resistive touch screen device, the method comprising:

determining touch coordinates when the resistive touch screen device is touched, wherein touch coordinates are determined by measuring a voltage that has a settling time dependent on the touch coordinates relative to initial coordinates of the resistive touch screen device, wherein the voltage is provided by the resistive touch screen device as an input signal to an analog to digital converter, wherein the analog to digital converter comprises a sampling capacitor and further receives a reference voltage, wherein during conversion the reference voltage is compared to a voltage on the sampling capacitor; and

adjusting a sampling time for the sampling capacitor depending on the touch coordinates relative to initial coordinates of the resistive touch screen device.

2. The method of claim 1 , wherein adjusting the sampling time allows the voltage to reach to a predetermined level.

3. The method of claim 1 , wherein the reference voltage is configurable, the method further comprising adjusting the reference voltage, depending on the touch coordinates away from the initial coordinates, to reach to a pre-determined level.

4. The method of claim 1 , wherein an x coordinate is determined by a first conversion of a first voltage received from the resistive touch screen.

5. The method of claim 4 , wherein a y coordinate is determined by a second conversion of a second voltage received from the resistive touch screen.

6. A method for enhancing touch sensitivity of a touch-based device, the method comprising:

identifying a location touched by a user on the touch-based device comprising a resistive touch screen by sampling an input signal, wherein the input signal is a voltage that has a settling time dependent on the location;

comparing the input signal with a reference voltage;

performing at least one of, based on the comparison:

adjusting a sampling time by adjusting a conversion clock width,

depending on a distance of the touch location from initial coordinates of the touch-based device and generating an output signal; and

adjusting a reference voltage by changing an input gain, depending on the distance of the touch location from initial coordinates of the touch-based device and generating the output signal.

7. A circuit interfacing with a resistive touch screen to provide an improved touch sensitivity, the circuit comprising an Analog-to-Digital Converter (ADC) configured for: determining touch coordinates when the resistive touch screen is touched, wherein touch coordinates are determined by measuring a voltage that has a settling time dependent on the touch coordinates relative to initial coordinates of the resistive touch screen device, wherein the voltage is provided by the resistive touch screen device as an input signal to the analog to digital converter, wherein the analog to digital converter comprises a sampling capacitor and further receives a reference voltage, wherein during conversion the reference voltage is compared to a voltage on the sampling capacitor;

wherein the circuit is configured to adjust a sampling time of the analog to digital converter depending on the touch coordinates relative to initial coordinates of the touch device and/or to adjust the reference voltage, depending on the touch coordinates relative to initial coordinates of the touch screen.

8. The circuit of claim 7 , wherein the circuit is configured to determine an x coordinate by converting a first voltage received from the resistive touch screen.

9. The circuit of claim 7 , wherein the circuit is configured to determine ay coordinate by converting a second voltage received from the resistive touch screen.

10. The circuit of claim 7 further comprising reference voltage source.

11. The circuit of claim 10 further comprising controllable trimmer coupled with the reference voltage source for adjusting the reference voltage.

12. The circuit of claim 7 further comprising a sampling switch coupled between the resistive touch screen and the sampling capacitor.

13. A touch-based device facilitating an improved touch sensitivity, the touch-based device comprising: a resistive touch screen sensor providing a first and a second voltage signal representing an x-coordinate and a y-coordinate, respectively, wherein the first and second voltage signals have a settling time dependent on the touch coordinates relative to initial coordinates of the resistive touch screen device;

a processor configured to determine touch coordinates, based on the input;

an Analog-to-Digital Converter (ADC) comprising a sampling capacitor configured to receive said first and second voltage signals, wherein the processor is configured to perform at least one of:

adjusting a sampling time of the ADC by adjusting a conversion clock width depending on touch location relative to the initial coordinates of the touch-based device; and

adjusting a reference voltage by changing an input gain at the ADC,

depending on touch location relative to the initial coordinates of the touch-based device; and

a display for displaying an output.