Charge pump circuit having switches
AssigneeBroadcom Corporation
InventorHung-Ming Chien
Life of this patent
Estimating the term…
Abstract
A charge pump circuit that supplies current to an offset current of an output signal for an oscillating circuit is disclosed. The charge pump circuit includes a first switch and a second switch. The first switch is coupled to a gate of an output diode that provides a charge up current from the charge pump circuit. A second switch is coupled to an anode of the output diode and supplies the charge up current to the output diode. The first switch comprises a first state and the second switch comprises a second state that is opposite the first state. Thus, when the second switch is on, the first switch is off. The charge pump circuit also includes a capacitance to hold a bias voltage when the first switch is off.
Claims15
A charge pump circuit to supply current to a controlled oscillating circuit, the charge pump circuit comprising:
- a first switch comprising a first state, said first switch coupled to a gate of an output diode;
- and
- a second switch comprising a second state opposite from said first state, the second switch coupled to an anode of the output diode,
- wherein the second switch is configured to provide a charge up current to the output diode when the second state comprises an ON state,
- wherein the first switch is coupled to a capacitance configured to hold a bias when the second state comprises the ON state, and
- wherein the output diode is configured to provide the charge up current to an offset current.
A circuit, comprising:
- an oscillator controlled by a current;
- and
- a charge pump circuit that generates the current in response to a signal, wherein the charge pump circuit includes:
- a first switch comprising a first state, said first switch coupled to a gate of an output diode;
- and
- a second switch comprising a second state opposite from said first state, the second switch coupled to an anode of the output diode,
- wherein the second switch is configured to provide the current to the output diode when the second state comprises an ON state,
- wherein the first switch is coupled to a capacitance configured to hold a bias when the second state comprises the ON state, and
- wherein the output diode is configured to provide the current to the oscillator.
Dependencies are inferred from the claim text.