Transceiver apparatus and module

• US 20060128322A1
• Filed: 12/09/2005
• Published: 06/15/2006
• Est. Priority Date: 12/10/2004
• Status: Abandoned Application

• Current Assignee: Hitachi Media Electronics Co., Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Media Electronics Co., Ltd. (Hitachi, Ltd.)
• Inventors: Katagishi, Makoto, Igarashi, Yutaka
• Application Number:
  US11/297,318
• Publication Number:
  US 20060128322A1
• Time in Patent Office: Days
• US Class Current: 455/78
• CPC Class Codes: H03G 3/3068 Circuits generating control signals for both R.F. and I.F. stages
• CPC Class Codes: H04B 1/0053 with common antenna for more than one band

Abstract

It is possible to facilitate design and reduce a size and power dissipation of a radio frequency integrated circuit RFIC for full duplex system, by forming a duplexer for passing only a desired band, a low noise amplifier circuit LNA for amplifying an output signal of the duplexer, and a BPF for passing only a desired band in an output signal of the LNA in the same module and preventing a leak level of a transmission signal to a receiver side from affecting the design of the RFIC.

Claims

1. A module that can be applied to a transceiver apparatus, the transceiver apparatus including an antenna, a duplexer for passing only a desired band in a signal from the antenna or a signal to the antenna, a low noise amplifier circuit for amplifying an output signal of the duplexer, a first band pass filter for passing only a desired band in an output signal of the low noise amplifier circuit, a radio frequency integrated circuit for conducting frequency conversion to a low frequency band on an output signal of the first band pass filter, a second band pass filter for passing only a desired band in a transmission signal generated by the radio frequency integrated circuit, a power amplifier circuit for amplifying an output signal of the second band pass filter, and an isolator inserted so as to make it possible for the power amplifier circuit to conduct power amplification efficiently even if impedance of the antenna changes and so as to stabilize impedance of the antenna seen from the power amplifier, the duplexer passing only a desired band in an output signal of the isolator and outputting the passed signal to the antenna,

wherein the module comprises the duplexer, the low noise amplifier circuit, and the first band pass filter.

2. A transceiver apparatus including an antenna, a duplexer for passing only a desired band in a signal from the antenna or a signal to the antenna, a low noise amplifier circuit for amplifying an output signal of the duplexer, a first band pass filter for passing only a desired band in an output signal of the low noise amplifier circuit, a radio frequency integrated circuit for conducting frequency conversion to a low frequency band on an output signal of the first band pass filter, a second band pass filter for passing only a desired band in a transmission signal generated by the radio frequency integrated circuit, a power amplifier circuit for amplifying an output signal of the second band pass filter, an isolator inserted so as to make it possible for the power amplifier circuit to conduct power amplification efficiently even if impedance of the antenna changes and so as to stabilize impedance of the antenna seen from the power amplifier, a coupler for branching an output signal of the isolator, and a detector circuit for detecting a signal level of an output of the coupler, the duplexer passing only a desired band in the output signal of the isolator and outputting the passed signal to the antenna,

wherein:

a bias current in the low noise amplifier circuit is increased when an output level of the detector circuit is high, and

the bias current in the low noise amplifier circuit is decreased when the output level of the detector circuit is low.

3. A module that can be applied to a transceiver apparatus, the transceiver apparatus including an antenna, a duplexer for passing only a desired band in a signal from the antenna or a signal to the antenna, a low noise amplifier circuit for amplifying an output signal of the duplexer, a first band pass filter for passing only a desired band in an output signal of the low noise amplifier circuit, a radio frequency integrated circuit for conducting frequency conversion to a low frequency band on an output signal of the first band pass filter, a second band pass filter for passing only a desired band in a transmission signal generated by the radio frequency integrated circuit, a power amplifier circuit for amplifying an output signal of the second band pass filter, an isolator inserted so as to make it possible for the power amplifier circuit to conduct power amplification efficiently even if impedance of the antenna changes and so as to stabilize impedance of the antenna seen from the power amplifier, a coupler for branching an output signal of the isolator, and a detector circuit for detecting a signal level of an output of the coupler, the duplexer passing only a desired band in the output signal of the isolator and outputting the passed signal to the antenna,

wherein:

the module comprises the duplexer, the low noise amplifier circuit, the first band pass filter, the coupler, and the detector circuit,

a bias current in the low noise amplifier circuit is increased when an output level of the detector circuit is high, and

the bias current in the low noise amplifier circuit is decreased when the output level of the detector circuit is low.

4. A module that can be applied to a transceiver apparatus, the transceiver apparatus including an antenna corresponding to operations in N (where N is an integer ≧

2) transceiver bands, an antenna switch for changing over N signals from the antennas in the transceiver bands and N signals to the antennas in the transceiver bands, N duplexers for passing only desired bands in signals from the antenna switch or signals to the antenna switch, N low noise amplifier circuits intended for N receiver bands for amplifying output signals of the duplexers, N first band pass filters intended for N receiver bands for passing only desired bands in output signals of the low noise amplifier circuits, a radio frequency integrated circuit for conducting frequency conversion to a low frequency band on output signals of the first band pass filters, N second band pass filters for passing only desired bands in transmission signals generated by the radio frequency integrated circuit, N power amplifier circuits for amplifying output signals of the second band pass filters so as to be able to output the output signals of the second band pass filters from the antenna at a desired transmission level, N isolators intended for N transmitter bands and inserted so as to make it possible for the power amplifier circuits to conduct power amplification efficiently even if impedance of the antenna changes and so as to stabilize impedance of the antenna seen from the power amplifiers, N couplers intended for N transmitter bands for branching output signals of the isolators, and N detector circuits intended for N transmission bands for detecting signal levels of outputs of the couplers, increasing a bias current in the low noise amplifier circuit when the detected output level is high, and decreasing the bias current in the low noise amplifier circuit when the detected output level is low, the duplexers passing only a desired band in the output signals of the isolators and outputting the passed signal to the antenna,

wherein;

the module comprises the antenna switch, the duplexers, the low noise amplifier circuits, the first band pass filters, the couplers, and the detector circuits.

5. A module that can be applied to a transceiver apparatus according to claim 4, wherein a control signal for changing over the antenna switch to a corresponding band and a control signal for turning on a low noise amplifier circuit intended only for a corresponding band among the N low noise amplifier circuits are supplied from the radio frequency integrated circuit.

6. A module intended for transceiver apparatus, the module comprising:

a switch for changing over a plurality of transceiver signals;

a plurality of duplexers connected to the switch to conduct frequency separation on the transceiver signals;

a plurality of low noise amplifiers for amplifying output receiver signals of the duplexers; and

a plurality of band pass filters connected respectively to the low noise amplifiers,

wherein the band pass filters output balanced signals.

7. A module intended for transceiver apparatus according to claim 6, wherein:

outputs of the band pass filters are connected to receiver terminals of the module, and

when mounting the module on the same plane as that of a direct conversion receiver circuit externally connected to the module, the receiver terminals of the module and input terminals of the direct conversion receiver circuit are arranged so as to be opposed to each other.

8. A module intended for transceiver apparatus according to claim 6, wherein:

outputs of the band pass filters are connected to receiver terminals of the module, and

when mounting the module on a plane opposite to that of a direct conversion receiver circuit externally connected to the module, the receiver terminals of the module and input terminals of the direct conversion receiver circuit are arranged so as to be opposed to each other.

9. A module intended for transceiver apparatus according to claim 6, wherein the switch, the duplexers, the low noise amplifiers, and the band pass filters are formed as separate chips.

10. A module intended for transceiver apparatus according to claim 6, wherein the duplexers, the low noise amplifiers, and the band pass filters are formed as

monolithic ICs so as to associate a mononolithic IC with each of a plurality of receiver bands.

11. A module intended for transceiver apparatus according to claim 6, wherein the whole of the switch, the duplexers, the low noise amplifiers, and the band pass filters is formed as a monolithic IC.

12. A transceiver apparatus comprising:

a switch for changing over a plurality of transceiver signals;

a plurality of duplexers connected to the switch to conduct frequency separation on the transceiver signals;

a plurality of low noise amplifiers for amplifying output receiver signals of the duplexers; and

a plurality of band pass filters connected respectively to the low noise amplifiers,

wherein a module intended for the transceiver apparatus from which the band pass filters output balanced signals is connected to a direct conversion receiver circuit.

13. A transceiver apparatus according to claim 12, wherein when mounting the module intended for the transceiver apparatus on the same plane as that of the direct conversion receiver circuit, signals lines of the balanced signals output from the module and the direct conversion receiver circuit are arranged and connected so as to be opposed to each other.