Charge-pump current source

A circuit, comprising:

• a charge-pump operable to supply an output voltage;
• a current mirror responsive to the output voltage of the charge-pump, and operable to output a relatively constant current and suppress noise from the output voltage;
• and
• a filter arranged between the charge-pump and the current mirror, the filter operable to further suppress noise from the output voltage,
• wherein the current mirror is operable to isolate the filter from a load circuit in communication with the current mirror,
• the charge-pump is directly coupled to the current mirror, and
• the load circuit includes a voltage reference generator operable to generate a reference voltage.

A circuit, comprising:

• a charge-pump operable to supply an output voltage;
• a current mirror responsive to the output voltage of the charge-pump, and operable to output a relatively constant current and suppress noise from the output voltage;
• and
• a filter arranged between the charge-pump and the current mirror, the filter operable to further suppress noise from the output voltage,
• wherein the current mirror is operable to isolate the filter from a load circuit in communication with the current mirror,
• the charge-pump is directly coupled to the current mirror, and
• the load circuit includes a voltage controlled oscillator operable to generate an output signal having a pre-determined oscillation frequency.

A circuit, comprising:

• a first charge-pump operable to supply an output voltage;
• and
• a current mirror responsive to the output voltage of the charge-pump, and operable to output a relatively constant current and suppress noise from the output voltage;
• and
• one or more second charge-pumps operable to supply an output voltage,
• wherein at least one of the first and second charge-pumps is directly coupled to the current mirror, and
• the current mirror is operable to suppress noise from the output voltage of the one or more second charge-pumps.

A circuit, comprising:

• supply means for supplying an output voltage;
• suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current;
• and
• filtering means arranged between the supply means and the suppression means, the filtering means for further suppressing noise from the supplied output voltage,
• wherein the suppression means isolates the filtering means from a loading means in communication with the suppression means,
• the supply means is directly coupled to the suppression means, and
• the loading means includes a regulator loop means for generating a consistent output voltage.

A circuit comprising:

• supply means for supplying an output voltage;
• suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current;
• and
• filtering means arranged between the supply means and the suppression means, the filtering means for further suppressing noise from the supplied output voltage,
• wherein the suppression means isolates the filtering means from a loading means in communication with the suppression means,
• the supply means is directly coupled to the suppression means, and
• the loading means includes a voltage reference generator means for generating a reference voltage.

A circuit, comprising:

• supply means for supplying an output voltage;
• suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current;
• and
• filtering means arranged between the supply means and the suppression means, the filtering means for further suppressing noise from the supplied output voltage,
• wherein the suppression means isolates the filtering means from a loading means in communication with the suppression means,
• the supply means is directly coupled to the suppression means, and
• the loading means includes a voltage controlled oscillator means for generating an output signal having a pre-determined oscillation frequency.

A circuit, comprising:

• supply means for supplying an output voltage;
• and
• suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current,
• wherein the supply means includes a plurality of charge-pump means, the supply means being directly coupled to the suppression means.

A method of suppressing noise, comprising:

• providing an output voltage with a supply apparatus having an associated noise component;
• suppressing the noise component with a suppression apparatus in the output voltage including supplying a relatively constant current in response to the output voltage and including directly coupling the supply apparatus with the suppression apparatus;
• filtering the output voltage with a filter apparatus to further suppress the noise component;
• and
• isolating the filter apparatus from a load circuit receiving the relatively constant current source,
• wherein isolating the filter apparatus includes isolating the filter apparatus from a regulator loop operable to generate a consistent output voltage.

A method of suppressing noise, comprising:

• providing an output voltage with a supply apparatus having an associated noise component;
• suppressing the noise component with a suppression apparatus in the output voltage including supplying a relatively constant current in response to the output voltage and including directly coupling the supply apparatus with the suppression apparatus;
• filtering the output voltage with a filter apparatus to further suppress the noise component;
• and
• isolating the filter apparatus from a load circuit receiving the relatively constant current source,
• wherein isolating the filter apparatus includes isolating the filter apparatus from a voltage reference generator operable to generate a reference voltage.

A method of suppressing noise, comprising:

• providing an output voltage with a supply apparatus having an associated noise component;
• suppressing the noise component with a suppression apparatus in the output voltage including supplying a relatively constant current in response to the output voltage and including directly coupling the supply apparatus with the suppression apparatus;
• filtering the output voltage with a filter apparatus to further suppress the noise component;
• and
• isolating the filter apparatus from a load circuit receiving the relatively constant current source,
• wherein isolating the filter apparatus includes isolating the filter apparatus from a voltage controlled oscillator operable to generate an output signal having a pre-determined oscillation frequency.

A method of suppressing noise, comprising:

• providing an output voltage having an associated noise component by using a supply apparatus;
• suppressing the noise component in the output voltage including supplying a relatively constant current in response to the output voltage by using a suppression apparatus directly coupled to the supply apparatus;
• and
• providing the output voltage to a load circuit from a plurality of charge-pumps, and suppressing noise from the output voltage of the plurality of charge-pumps.

An Ethernet transceiver, comprising:

• a transmitter;
• a receiver;
• a charge-pump operable to supply an output voltage to a current mirror;
• the current mirror arranged between the charge-pump and a voltage regulator and being directly coupled to the charge-pump, the current mirror operable to supply a relatively constant current to the voltage regulator and suppress noise from the output voltage of the charge-pump;
• and
• the voltage regulator further in communication with at least one of the transmitter and the receiver, the voltage regulator operable to provide a relatively constant voltage to the at least one of the transmitter and the receiver.

An Ethernet transceiver, comprising:

• transmitter means for transmitting a signal;
• receiver means for receiving a signal;
• and
• supply means for supplying an output voltage to a noise suppression means, the noise suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current, and supplying the relatively constant current to a loading means,
• wherein the noise suppression means comprises:
• filtering means for further suppressing noise from the supplied output voltage,
• wherein noise suppression means isolates the filtering means from the loading means,
• the supply means is directly coupled to the noise suppression means, and
• the loading means includes a regulator loop means for generating a consistent output voltage.

An Ethernet transceiver, comprising:

• transmitter means for transmitting a signal;
• receiver means for receiving a signal;
• and
• supply means for supplying an output voltage to a noise suppression means, the noise suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current, and supplying the relatively constant current to a loading means,
• wherein the noise suppression means comprises:
• filtering means for further suppressing noise from the supplied output voltage,
• wherein noise suppression means isolates the filtering means from the loading means,
• the supply means is directly coupled to the noise suppression means, and
• the loading means includes a voltage reference generator means for generating a reference voltage.

An Ethernet transceiver, comprising:

• transmitter means for transmitting a signal;
• receiver means for receiving a signal;
• and
• supply means for supplying an output voltage to a noise suppression means, the noise suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current, and supplying the relatively constant current to a loading means,
• wherein the noise suppression means comprises:
• filtering means for further suppressing noise from the supplied output voltage,
• wherein noise suppression means isolates the filtering means from the loading means,
• the supply means is directly coupled to the noise suppression means, and
• the loading means includes a voltage controlled oscillator means for generating an output signal having a pre-determined oscillation frequency.

An Ethernet transceiver, comprising:

• transmitter means for transmitting a signal;
• receiver means for receiving a signal;
• and
• supply means for supplying an output voltage to a noise suppression means, the noise suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current, and supplying the relatively constant current to a loading means,
• wherein the supply means includes a plurality of charge-pump means, and
• the supply means is directly coupled to the noise suppression means.

An Ethernet transceiver, comprising:

• transmitter means for transmitting a signal;
• receiver means for receiving a signal;
• and
• supply means for supplying an output voltage to a noise suppression means, the noise suppression means for suppressing noise from the supplied output voltage and converting the supplied output voltage into a relatively constant current, and supplying the relatively constant current to a loading means,
• wherein the Ethernet transceiver is compliant with IEEE 1000BaseT, and
• the supply means is directly coupled to the noise suppression means.