Charge pump circuit and controlling method thereof
First Claim
1. A charge pump circuit, comprising:
- a switch module, comprising a plurality of switches, a plurality of output capacitors, a loading resistor and a soft ramp-up switch, configured to generate a first output voltage and a second output voltage according to an input voltage; and
a digital control circuit, coupled to the switch module, configured to receive a up digital signal and a down digital signal, and adjust the first output voltage to a voltage level of the input voltage and adjust the second output voltage to a ground voltage level according to the up digital signal and the down digital signal;
wherein the up digital signal and the down digital signal are varied with time.
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Abstract
The application provides a charge pump circuit, including a switch module, including a plurality of switches and a soft ramp-up switch, configured to generate a first output voltage and a second output voltage according to an input voltage; and a digital control circuit, coupled to the switch module, configured to receive a up digital signal and a down digital signal, and adjust the first output voltage to a voltage level of the input voltage and adjust the second output voltage to a ground voltage level according to the up digital signal and the down digital signal. The charge pump circuit of application has advantages of minimizing inrush currents to avoid circumstances of distortions caused by the pop noises or clipping and optimizing the efficiency of the amplifier.
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Citations
20 Claims
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1. A charge pump circuit, comprising:
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a switch module, comprising a plurality of switches, a plurality of output capacitors, a loading resistor and a soft ramp-up switch, configured to generate a first output voltage and a second output voltage according to an input voltage; and a digital control circuit, coupled to the switch module, configured to receive a up digital signal and a down digital signal, and adjust the first output voltage to a voltage level of the input voltage and adjust the second output voltage to a ground voltage level according to the up digital signal and the down digital signal; wherein the up digital signal and the down digital signal are varied with time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A controlling method for a charge pump circuit, wherein the charge pump circuit comprises a switch module, a digital-to-analog converter (DAC), a digital control circuit and a balance release circuit, the controlling method comprising:
generating a first output voltage and a second output voltage according to an input voltage and transforming the first output voltage and the second output voltage by the charge pump circuit among a first mode, a ramp-up mode, a second mode and a balance release mode according to an input voltage. - View Dependent Claims (17, 18, 19, 20)
Specification