Dual mode transceiver
First Claim
1. A dual mode transceiver operable in either a Frequency Division Duplexing (FDD) or Time Division Duplexing (TDD) mode comprising:
- an up conversion path for converting an intermediate frequency (IF) signal to a radio frequency (RF) signal in either an upper frequency range or a lower frequency range;
a down conversion path for converting a received RF signal in either an upper frequency range or a lower frequency range to an IF signal;
a diplexer, having an upper range filter and a lower range filters for connecting to an antenna;
a switch array which in FDD mode, connects said up conversion path to one of said upper range filter and said lower range filter and connects said down conversion path to the other said filter, and, in TDD mode, alternatively connects said up and down conversion paths to a selected one of said upper range filter and said lower range filter;
a switch controller for selecting which connections are made by said switch array depending on mode of operation and on whether said transceiver is transmitting or receiving; and
a mode selection switch, for selecting whether said transceiver is operating in FDD or TDD mode.
4 Assignments
0 Petitions
Accused Products
Abstract
A dual mode transceiver architecture suitable for adaptation in either a handset or a base station and capable of operating in both Frequency Division Duplex (FDD) mode or in Time Division Duplexing (TDD) mode is disclosed. Such a transceiver has an up conversion path capable of up converting an Intermediate Frequency (IF) to a Radio Frequency (RF) signal in either an upper band frequency range or a lower band frequency range. Also the transceiver has a down conversion path, used for receiving, for down converting a RF signal in either the upper band or lower band to a desirable IF frequency. The transceiver includes a switch array capable of switching the up conversion path to either the upper band port or the lower band port of a diplexer and the switch array also switches the upper band port and lower band port of the diplexer to the down conversion path depending on whether the transceiver is operating in TDD mode or FDD mode. Also, if in TDD mode, the switch array determines whether the transceiver is transmitting or receiving.
130 Citations
22 Claims
-
1. A dual mode transceiver operable in either a Frequency Division Duplexing (FDD) or Time Division Duplexing (TDD) mode comprising:
-
an up conversion path for converting an intermediate frequency (IF) signal to a radio frequency (RF) signal in either an upper frequency range or a lower frequency range; a down conversion path for converting a received RF signal in either an upper frequency range or a lower frequency range to an IF signal; a diplexer, having an upper range filter and a lower range filters for connecting to an antenna; a switch array which in FDD mode, connects said up conversion path to one of said upper range filter and said lower range filter and connects said down conversion path to the other said filter, and, in TDD mode, alternatively connects said up and down conversion paths to a selected one of said upper range filter and said lower range filter; a switch controller for selecting which connections are made by said switch array depending on mode of operation and on whether said transceiver is transmitting or receiving; and a mode selection switch, for selecting whether said transceiver is operating in FDD or TDD mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A dual mode transceiver comprising:
-
transmit means for up converting an intermediate frequency (IF) signal to a radio frequency (RF) signal in either an upper frequency range or a lower frequency range; receive means for down converting a received RF signal in either an upper frequency range or a lower frequency range to an IF signal; means for connecting an upper band filter and a lower band filter to an antenna; switch means for; connecting an up converted signal to be transmitted to either the upper band filter or the lower band filter, connecting the upper band filter to either the output of the transmit means or the input of the receive means, connecting the lower band filter to either the output of the transmit means or the input of the receive means, and connecting the input of the receive means to either the upper band filter or the lower band filter; and controller means for selecting which connections are made by said switch means depending on in which mode the transceiver is operating and on whether said transceiver is transmitting or receiving.
-
Specification