What is claimed is:
1. An amplifier circuit comprising:
a comparing and amplifying section that compares a target voltage and a reference voltage and amplifies a difference of the target voltage and the reference voltage; and
a phase compensator that compensates for a shift of input and output phases, the phase compensator including two resistors and a capacitor, the two resistors being serially connected between bases of two sub transistors that flow the same current as that in a differential transistor pair comprising two transistors, the capacitor having a terminal connected to an output terminal of the amplifier circuit, and the capacitor having a terminal connected via one of the two resistors to the base of one of the two sub transistors receiving an amplifier output voltage outputted from the output terminal.
2. The amplifier circuit as set forth in claim 1, wherein the phase compensator includes a phase advancing capacitor that compensates for an output phase delay.
3. The amplifier circuit as set forth in claim 2, wherein the phase advancing capacitor is connected in parallel to the two resistors.
4. The amplifier circuit as set forth in claim 3, wherein the phase advancing capacitor is connected between the output terminal and the base of one of the two sub transistors on a side of the output terminal.
5. A power supply comprising:
an output transistor; and
an error amplifier that controls an output voltage according to a difference of a feedback voltage and a reference voltage, the feedback voltage being a feedback output voltage of the output transistor, the error amplifier including:
a comparing and amplifying section that compares a target voltage and a reference voltage and amplifies a difference of the target voltage and the reference voltage; and
a phase compensator that compensates for a shift of input and output phases, the phase compensator including two resistors and a capacitor, the two resistors being serially connected between bases of two sub transistors that flow the same current as that in a differential transistor pair comprising two transistors, the capacitor having a terminal connected to an output terminal of the amplifier circuit, and the capacitor having a terminal connected via one of the two resistors to the base of one of the two sub transistors receiving an amplifier output voltage outputted from the output terminal.
6. The power supply as set forth in claim 5, wherein the phase compensator further includes a phase advancing capacitor that compensates for an output phase delay.
7. The power supply as set forth in claim 6, wherein the phase advancing capacitor is connected between a generating point of the output voltage and the base of one of the two sub transistors on a side of the output terminal.
8. The power supply as set forth in claim 7, wherein the phase advancing capacitor is a capacitor that decreases its capacitance with increase in applied voltage.
9. The power supply as set forth in claim 8, wherein the phase advancing capacitor is a chip-stacked ceramic capacitor incorporating a semiconductor junction.
10. The power supply as set forth in claim 6, wherein the phase advancing capacitor is connected between a generating point of the feedback voltage and the base of one of the two sub transistors on a side of the output terminal.
11. The power supply as set forth in claim 10, wherein the phase advancing capacitor is a capacitor that decreases its capacitance with increase in applied voltage.
12. The power supply as set forth in claim 11, wherein the phase advancing capacitor is a chip-stacked ceramic capacitor incorporating a semiconductor junction.
13. The power supply as set forth in claim 6, wherein the phase advancing capacitor is connected in parallel to the two resistors.
14. The power supply as set forth in claim 6, wherein the phase advancing capacitor is connected between the output terminal and the base of one of the two sub transistors on a side of the output terminal.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of providing Internet Protocol (IP) data communication in a near field communication (NFC) peer to peer communication environment, comprising:
establishing a NFC peer to peer link between an initiator NFC device and a target NFC device;
transmitting a first configuration frame containing IP configuration parameters associated with the initiator NFC device to the target NFC device via a NFC interface;
receiving a second configuration frame containing IP configuration parameters associated with the target NFC device via the NFC interface in response to the first configuration frame;
setting up an IP communication with the target NFC device over the NFC interface based on the IP configuration parameters associated with the target NFC device; and
exchanging IP data with the target NFC device over the NFC interface in a NFC peer to peer mode upon successfully setting up the IP communication.
2. The method of claim 1, wherein the IP configuration parameters associated with the initiator NFC device comprise a configuration frame type, an IP address associated with the initiator NFC device, a role associated with the initiator NFC device, and a network interface type supported by the initiator NFC device.
3. The method of claim 1, wherein the IP configuration parameters associated with the target NFC device comprise a configuration frame type, an IP address associated with the target NFC device, a role associated with the target NFC device, and a network interface type supported by the target NFC device.
4-5. (canceled)
6. The method of claim 1, wherein exchanging the IP data with the target NFC device over the NFC interface upon successfully setting up the IP communication comprises:
transmitting at least one IP data packet containing IP data to the target NFC device over the NFC interface in the NFC peer-to-peer mode using the IP configuration parameters associated with the target NFC device.
7. The method of claim 6, wherein transmitting the at least one IP data packet containing the IP data to the target NFC device over the NFC interface in the NFC peer-to-peer mode comprises:
receiving a request to provide access to a global network from the target NFC device;
fetching IP data from the global network based on the request received from the target NFC device; and
transmitting at least one IP data packet containing the fetched IP data to the target NFC device over the NFC interface in the NFC peer-to-peer mode.
8. The method of claim 1, wherein exchanging the IP data with the target NFC device over the NFC interface upon successfully setting up the IP communication comprises:
receiving at least one IP data packet containing IP data from the target NFC device over the NFC interface.
9. The method of claim 8, wherein receiving the at least one IP data packet containing the IP data from the target NFC device over the NFC interface in the NFC peer-to-peer mode comprises:
determining whether the target NFC device is connected to a global network based on the IP configuration parameters associated with the target NFC device;
sending a request to provide access to the global network to the target NFC device if the target NFC device is connected to the global network; and
receiving at least one IP data packet containing IP data from the target NFC device over the NFC interface.
10. (canceled)
11. The method of claim 1, wherein setting up the IP communication with the target NFC device over the NFC interface based on the IP configuration parameters associated with the target NFC device comprises:
dynamically generating an ARP table based on the IP configuration parameters in the second configuration frame.
12. The method of claim 1, wherein setting up the IP communication with the target NFC device over the NFC interface based on the IP configuration parameters associated with the target NFC device comprises:
dynamically resolving duplicate addresses based on the IP configuration parameters in the second configuration frame.
13-24. (canceled)
25. A target near field communication (NFC) device configured to provide Internet Protocol (IP) data communication in a NFC peer to peer communication environment, the target NFC device comprising:
a transceiver;
a memory; and
a processor;
wherein the processor is configured for:
establishing a NFC peer to peer link with a target NFC device;
transmitting a first configuration frame containing IP configuration parameters to the target NFC device via the transceiver;
receiving a second configuration frame containing IP configuration parameters associated with the target NFC device via the transceiver in response to the first configuration frame;
setting up an IP communication with the target NFC device over the transceiver based on the IP configuration parameters associated with the target NFC device; and
exchanging IP data with the target NFC device over the transceiver in a NFC peer to peer mode upon successfully setting up the IP communication.
26. The target NFC device of claim 25, wherein IP configuration parameters comprise a configuration frame type, an IP address, a role, and a network interface type.
27. The target NFC device of claim 26, wherein the role is selected from the group consisting of an Adhoc, and device with wider network connectivity.
28. The target NFC device of claim 26, wherein the IP address comprises one of an IPV4 address and IPv6 address.
29-34. (canceled)
35. The target NFC device of claim 25, wherein the IP configuration parameters associated with the initiator NFC device comprise a configuration frame type, an IP address associated with the initiator NFC device, a role associated with the initiator NFC device, and a network interface type supported by the initiator NFC device.
36. The target NFC device of claim 35, wherein the IP configuration parameters associated with the target NFC device comprise a configuration frame type, an IP address associated with the target NFC device, a role associated with the target NFC device, and a network interface type supported by the target NFC device.
37. The target NFC device of claim 25, wherein the processor transmits at least one IP data packet containing IP data to the initiator NFC device over the transceiver in the NFC peer-to-peer mode using the IP configuration parameters associated with the initiator NFC device.
38. The target NFC device of claim 37, wherein the processor is configured to:
receive a request to provide access to a global network from the initiator NFC device;
fetch IP data from the global network based on the request received from the initiator NFC device; and
transmit at least one IP data packet containing the fetched IP data to the initiator NFC device over the transceiver in the NFC peer-to-peer mode.
39. The target NFC device of claim 25, wherein the processor is configured to:
determine whether the initiator NFC device is connected to a global network based on the IP configuration parameters associated with the initiator NFC device;
send a request to provide access to the global network to the initiator NFC device if the initiator NFC device is connected to the global network; and
receive at least one IP data packet containing IP data from the initiator NFC device over the transceiver.
40. The target NFC device of claim 25, wherein the processor dynamically generates an ARP table based on the IP configuration parameters in the first configuration frame.
41. The target NFC device of claim 25, wherein the processor dynamically resolves duplicate addresses based on the IP configuration parameters in the first configuration frame.