1. A mobile phone capable of automatically handling smart card, comprising:
a cover;
a card connector mounted in the cover;
a card holder for holding the smart card and comprising a plurality of contact points and a sheet with at least a portion thereof responsive to magnetic forces, wherein the sheet is mounted on the back of the card holder, and the contact points are arranged on a sidewall of the card holder and contact with the card connector when the smart card is drawn into the mobile phone, thereby the smart card is electrically connected to the card connector;
a supporting member mounted in the cover, wherein a plurality of electromagnets are mounted on the supporting member, when the electromagnets are electrified one by one according to a first order, the sheet is attracted by the electromagnets one by one according to the first order, and thus the card holder is drawn into the mobile phone along the supporting member; when the electromagnets are electrified one by one according to a second order, the sheet is attracted by the electromagnets one by one according to the second order, thus the card holder is ejected from the mobile phone along the supporting member;
a switch unit configured for generating a switch signal for drawing in the card holder or ejecting the card holder in response to user operations;
a processor electrically connected to the connector and configured for determining whether the switch signal transmitted from the switch unit is for drawing in the card holder or ejecting the card holder; and
an electromagnet controlling unit configured for electrifying the electromagnets one by one according to the first order when the switch signal is determined to draw in the card holder, and electrifying the electromagnets one by one according to the second order when the switch signal is determined to eject the card holder.
2. The mobile phone as described in claim 1, wherein a through slot is defined in a sidewall of the cover to allow the card holder to extend through.
3. The mobile phone as described in claim 2, wherein the first order is that the electromagnets are electrified one by one from the electromagnet which is nearest the slot to the electromagnet which is furthest apart from the slot, and the sheet is attracted by the electromagnets one by one according to the first order is that the sheet is attracted by the electromagnets one by one from the electromagnet which is nearest the slot to the electromagnet which is furthest apart from the slot; and the second order is that the electromagnets are electrified one by one from the electromagnet which is furthest apart from the slot to the electromagnet which is nearest to the slot, and the sheet is drawn by the electromagnets one by one according to the second order is that the sheet is attracted by the electromagnets one by one from the electromagnets which is furthest apart from the slot to the electromagnets which is nearest the slot.
4. The mobile phone as described in claim 2, wherein the card connector is mounted between two electromagnets which are furthest apart from the slot.
5. The mobile phone as described in claim 1, two projection bar protrude out from two sidewalls of the card holder respectively, and two rails are formed on the supporting member, the projection bar move along the rails when the card holder is drawn into the mobile phone or ejected from the mobile phone along the supporting member.
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 for enabling communication, the method comprising:
in a chip comprising a plurality of amplifiers and a multi-tap transformer integrated on a single substrate:
selectively enabling one or more of said plurality of amplifiers; and
adjusting a gain of said one or more of said plurality of amplifiers that are enabled, wherein:
each of said plurality of amplifiers is coupled to one of different pairs of taps on said multi-tap transformer;
each of said different pairs of taps have at least one primary winding of said multi-tap transformer in common;
an impedance of each of said plurality of amplifiers is matched to an impedance of said corresponding pair of taps on said multi-tap transformer.
2. The method according to claim 1, wherein said plurality of amplifiers comprise two or more power amplifiers.
3. The method according to claim 2, wherein an output impedance of each of said two or more power amplifiers is different.
4. The method according to claim 1, wherein said multi-tap transformer is coupled to an on-chip antenna.
5. The method according to claim 1, wherein said multi-tap transformer is coupled to an antenna integrated on a package coupled to said chip.
6. The method according to claim 5, wherein said multi-tap transformer is integrated on said package.
7. The method according to claim 1, comprising communicating RF signals via said selectively enabled amplifiers and said multi-tap transformer.
8. A system for enabling communication, the system comprising:
one or more circuits on a chip integrated on a single substrate, said one or more circuits comprising a plurality of amplifiers and a multi-tap transformer;
said one or more circuits are configured to:
selectively enable one or more of said plurality of amplifiers; and
adjust a gain of said one or more of said plurality of amplifiers that are enabled, wherein:
each of said plurality of amplifiers is coupled to one of different pairs of taps on said multi-tap transformer;
each of said different pairs of taps have at least one primary winding of said multi-tap transformer in common;
an impedance of each of said plurality of amplifiers is matched to an impedance of said corresponding pair of taps on said multi-tap transformer.
9. The system according to claim 8, wherein said plurality of amplifiers comprise two or more power amplifiers.
10. The system according to claim 9, wherein an output impedance of each of said two or more power amplifiers is different.
11. The system according to claim 8, wherein said multi-tap transformer is coupled to an on-chip antenna.
12. The system according to claim 8, wherein said multi-tap transformer is coupled to an antenna integrated on a package coupled to said chip.
13. The system according to claim 12, wherein said multi-tap transformer is integrated on said package.
14. The system according to claim 8, wherein said one or more circuits are operable to communicate RF signals via said selectively enabled amplifiers and said multi-tap transformer.
15. The system according to claim 8, wherein said multi-tap transformer comprises ferromagnetic materials integrated in said chip.
16. A communication system comprising:
a multi-tap transformer comprising a first pair of taps and a second pair of taps, wherein said first pair of taps and said second pair of taps have at least one primary winding of said multi-tap transformer in common;
a first amplifier coupled to said first pair of taps, wherein an impedance of said first amplifier is matched to an impedance of said first pair of taps;
a second amplifier coupled to said second pair of taps, wherein an impedance of said second amplifier is matched to an impedance of said second pair of taps; and
a circuit configured to:
selectively enable one or both of said first amplifier and said second amplifier to communicate RF signals; and
adjust a gain of said one or both of said first amplifier and said second amplifier that are enabled.