Charge pump circuit and controlling method thereof
First Claim
1. A digital control circuit, configured to receive a up digital signal and a down digital signal, and adjust a first output voltage to a voltage level of an input voltage and adjust an second output voltage to a ground voltage level according to the up digital signal and the down digital signal, comprising:
- a digital-to-analog converter (DAC), configured to generate a corresponding up reference voltage and a corresponding down reference voltage according to the up digital signal and the down digital signal; and
a voltage follower, comprising a plurality of operational amplifiers and a plurality of transistor switches, configured to lock the first output voltage and the second output voltage according to the up reference voltage and the down reference voltage;
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, includes a digital control circuit, coupled to the switch module, configured to receive a up digital signal and a down digital signal, and adjust a first output voltage to a voltage level of an input voltage and adjust an second output voltage to a ground voltage level according to the up digital signal and the down digital signal; a digital-to-analog converter (DAC), configured to generate a corresponding up reference voltage and a corresponding down reference voltage according to the up digital signal and the down digital signal; and a voltage follower, comprising a plurality of operational amplifiers and a plurality of transistor switches, configured to lock the first output voltage and the second output voltage according to the up reference voltage and the down reference voltage; wherein the up digital signal and the down digital signal are varied with time.
8 Citations
20 Claims
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1. A digital control circuit, configured to receive a up digital signal and a down digital signal, and adjust a first output voltage to a voltage level of an input voltage and adjust an second output voltage to a ground voltage level according to the up digital signal and the down digital signal, comprising:
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a digital-to-analog converter (DAC), configured to generate a corresponding up reference voltage and a corresponding down reference voltage according to the up digital signal and the down digital signal; and a voltage follower, comprising a plurality of operational amplifiers and a plurality of transistor switches, configured to lock the first output voltage and the second output voltage according to the up reference voltage and the down reference voltage; wherein the up digital signal and the down digital signal are varied with time.
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2. A charge pump circuit, comprising:
a digital control circuit, coupled to a switch module of the charge pump, configured to receive a up digital signal and a down digital signal, and adjust a first output voltage to a voltage level of an input voltage and adjust an second output voltage to a ground voltage level according to the up digital signal and the down digital signal, comprising; a digital-to-analog converter (DAC), configured to generate a corresponding up reference voltage and a corresponding down reference voltage according to the up digital signal and the down digital signal; and a voltage follower, comprising a plurality of operational amplifiers and a plurality of transistor switches, configured to lock the first output voltage and the second output voltage according to the up reference voltage and the down reference voltage. - View Dependent Claims (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, comprising:
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receiving a up digital signal and a down digital signal; converting the up digital signal and the down digital signal to a up reference voltage and a down reference voltage; adjusting a first output voltage to a voltage level of an input voltage and an second output voltage to a ground voltage level according to the up reference voltage and the down reference voltage; turning on a plurality of transistor switches of the digital control circuit of the charge pump circuit to connect the input voltage and a ground voltage level; discharging the first output voltage and charging the second output voltage; and maintaining a common mode voltage of the first output voltage and the second output voltage at a fixed value by a common mode feedback loop. - View Dependent Claims (17, 18, 19, 20)
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Specification