Low noise charge pump circuit
AssigneeTexas Instruments Incorporated
InventorsTuomas TUIKKANEN, Markus SILJANDER, Mikko LOIKKANEN
Life of this patent
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Abstract
A charge pump circuit includes first and second capacitors, first, second, third and fourth switches, and a transistor. The first switch is coupled between a top plate of the first capacitor and a first voltage input terminal. The second switch is coupled between a bottom plate of the first capacitor and a reference voltage terminal. The third switch is coupled between the top plate of the first capacitor and a top plate of the second capacitor. The transistor and the fourth switch are coupled in series between the bottom plate of the first capacitor and a second voltage input terminal.
Claims25
A charge pump circuit, comprising:
- a first capacitor and a second capacitor;
- a first switch coupled between a top plate of the first capacitor and a first voltage input terminal;
- a second switch coupled between a bottom plate of the first capacitor and a reference voltage terminal;
- a third switch coupled between the top plate of the first capacitor and a top plate of the second capacitor;
- and
- a transistor and fourth switch coupled in series between the bottom plate of the first capacitor and a second voltage input terminal.
A charge pump circuit comprising:
- a first capacitor and a second capacitor;
- a first switch coupled between a top plate of the first capacitor and first voltage input terminal;
- a second switch coupled between the top plate of the first capacitor and a top plate of the second capacitor;
- a threshold level shift circuit coupled the first switch and a reference voltage terminal, the threshold level shift circuit including:
- a proportional-to-absolute-temperature (PTAT) current source;
- and
- a current mirror circuit including a control transistor and a mirror transistor, in which:
- the mirror transistor is coupled between first switch and the reference voltage terminal;
- and
- the control transistor is coupled between the PTAT current source and the reference voltage terminal.
A circuit comprising:
- a first transistor coupled between a power input terminal and a power output terminal, the first transistor having a first control terminal;
- an amplifier having a first amplifier input, a second amplifier input, and an amplifier output, in which the first amplifier input is coupled to the power output terminal and the second amplifier input is coupled to a reference voltage circuit;
- a charge pump circuit including:
- a first capacitor having a first top plate and a first bottom plate;
- a second capacitor having a second top plate and a second bottom plate, in which the second top plate is coupled to the first control terminal;
- a first switch coupled between the first top plate and the power output terminal, the first switch having a first control input;
- a second switch coupled between the first bottom plate and a reference voltage terminal, the second switch having a second control input;
- a third switch coupled between the first top plate and the second top plate, the third switch having a third control input;
- a second transistor and fourth switch coupled in series between the first bottom plate and a voltage input terminal, the fourth switch having a fourth control input;
- a clock generator having:
- a first clock phase output coupled to the first control input and the second control input;
- a second clock phase output coupled to the fourth control input;
- and
- a third clock phase output coupled to the third control input.
Dependencies are inferred from the claim text.