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US 11,239,750 B2Granted
Charge pump circuits
AssigneeTexas Instruments Incorporated
InventorMaciej Piotr Jankowski
Life of this patent
Estimating the term…
Abstract
A charge pump circuit includes a voltage output terminal, a flying capacitor, and a current source. The flying capacitor includes a first terminal coupled to the voltage output terminal, and a second terminal coupled to an output terminal of a drive circuit. The current source includes a first terminal coupled to the voltage output terminal, and a second terminal coupled to a power supply rail.
Claims22
A charge pump circuit having an output, the charge pump circuit comprising:
- a first circuit coupled to the output, the first circuit including:
- a first transistor having a first control input;
- and
- second and third transistors arranged as a current mirror coupled to the first transistor and to the output of the charge pump circuit
- a second circuit including:
- a capacitor;
- a fourth transistor having a second control input;
- and
- a switch coupled to the capacitor, the fourth transistor, and the output;
- a control circuit having an input, a first control output coupled to the first control input, and a second control output coupled to the second control input;
- and
- an error amplifier having an amplifier input coupled to the output of the charge pump circuit and having an amplifier output coupled to the input of the control circuit.
9 more elements
A charge pump having an output, the charge pump circuit comprising:
- a first circuit coupled to the output and including a first transistor having a first control input;
- a second circuit including:
- a capacitor;
- a second transistor having a second control input;
- and
- a switch coupled to the capacitor, the second transistor, and the output;
- a control circuit having an input, a first control output coupled to the first control input, and a second control output coupled to the second control input, the control circuit is a Monticelli class AB control circuit including:
- a current source having a current source terminal coupled to the first control input;
- and
- third and fourth transistors each having a respective first transistor terminal and a respective second transistor terminal, the first transistor terminals are coupled to the current source terminal and the first control input and the second transistor terminals are coupled to the second control input;
- and
- an error amplifier having an amplifier input coupled to the output of the charge pump circuit and having an amplifier output coupled to the input of the control circuit.
9 more elements
An analog front-end circuit comprising:
- a chopper circuit;
- and
- a charge pump circuit having an output coupled to the chopper circuit, the charge pump circuit including:
- a first circuit coupled to the output and including:
- a first field-effect transistor (FET) having a first gate;
- and
- second and third FETs arranged as a current mirror coupled to the first FET and to the output of the charge pump circuit
- a second circuit including:
- a capacitor;
- a fourth FET having a second gate;
- and
- a switch coupled to the capacitor, the fourth FET, and the output;
- a control circuit having an input, a first control output coupled to the first gate, and a second control output coupled to the second gate;
- and
- an error amplifier having an amplifier input coupled to the output of the charge pump circuit and having an amplifier output coupled to the input of the control circuit.
12 more elements
An analog front-end circuit comprising:
- a chopper circuit;
- and
- a charge pump circuit having an output coupled to the chopper circuit, the charge pump circuit including:
- a first circuit coupled to the output and including a first field-effect transistor (FET) having a first gate;
- a second circuit including:
- a capacitor;
- a second FET having a second gate;
- and
- a switch coupled to the capacitor, the second FET, and the output;
- a control circuit having an input, a first control output coupled to the first gate, and a second control output coupled to the second gate, the control circuit is a Monticelli class AB control circuit including:
- a current source having a current source terminal coupled to the first gate;
- and
- third and fourth FETs each having a respective first transistor terminal and a respective second transistor terminal, the first transistor terminals are coupled to the current source terminal and the first gate, and the second transistor terminals are coupled to the second gate;
- and
- an error amplifier having an amplifier input coupled to the output of the charge pump circuit and having an amplifier output coupled to the input of the control circuit.
12 more elements
A charge pump circuit having an output, the charge pump circuit comprising:
- a first circuit coupled to the output and including a first field-effect transistor (FET) having a first gate, and second and third FETs arranged as a current mirror coupled to the first FET and to the output of the charge pump circuit;
- a second circuit including:
- a capacitor;
- a fourth FET having a second gate;
- and
- a switch coupled to the capacitor, the fourth FET, and the output;
- and
- a control circuit having an input, a first control output coupled to the first gate, and a second control output coupled to the second gate, wherein the control circuit is configured to:
- provide a first control signal at the first gate responsive to receiving a first input signal at its input indicating a voltage at the output of the charge pump circuit is below a voltage threshold;
- and
- provide a second control signal at the second gate responsive to receiving a second input signal at its input indicating the voltage at the output of the charge pump circuit exceeds the voltage threshold.
8 more elements
A charge pump circuit having an output, the charge pump circuit comprising:
- a first circuit coupled to the output and including a first field-effect transistor (FET) having a first gate;
- a second circuit including:
- a capacitor;
- a second FET having a second gate;
- and
- a switch coupled to the capacitor, the second FET, and the output;
- and
- a control circuit having an input, a first control output coupled to the first gate, and a second control output coupled to the second gate, the control circuit configured to:
- provide a first control signal at the first gate responsive to receiving a first input signal at its input indicating a voltage at the output of the charge pump circuit is below a voltage threshold;
- and
- provide a second control signal at the second gate responsive to receiving a second input signal at its input indicating the voltage at the output of the charge pump circuit exceeds the voltage threshold;
- and
- the control circuit is a Monticelli class AB control circuit including:
- a current source having a current source terminal coupled to the first gate;
- and
- third and fourth FETs each having a respective first transistor terminal and a respective second transistor terminal,
- the first transistor terminals are coupled to the current source terminal and the first gate, and
- the second transistor terminals are coupled to the second gate.
15 more elements
Dependencies are inferred from the claim text.