Wireless communication frequency signal amplification apparatus and transmitting and receiving apparatus
First Claim
1. A wireless communication frequency signal amplification apparatus, comprising:
- a first path having at least one amplifier having a first semiconductor device at an output stage thereof;
a second path having an output lower than that of the first path, and the second path having at least one amplifier having a second semiconductor device formed to accomodate a smaller output than an output of the first semiconductor device at an output stage thereof;
a control circuit to control the paths so that the paths are operative one at a time;
a branching circuit on an input side and a branching circuit on an output side of the paths for branching an input signal into an operative one of the paths in accordance with a desired output level of the apparatus; and
a phase adjuster for adjusting a phase of the signal so that signal so that the phase of the signal through the first path when the first path is operative becomes substantially the same as the phase of the signal though the second path when the second path is operative.
5 Assignments
0 Petitions
Accused Products
Abstract
To provide a high frequency amplifying apparatus for reducing a phase change caused in switching to a different output level, a variable phase shifter is provided at at least one location of respective paths rearward from a branching circuit for switching a path on a high output side having an amplifier using a first semiconductor device at an output stage and a path on a low output side having an amplifier using a second semiconductor device with a smaller output than the first semiconductor device on an output stage in accordance with a desired output level. After branching and a phase length of the variable phase shifter is set to a pre-determined value such that passing phase lengths of the respective paths become substantially the same by passing either of the paths.
21 Citations
19 Claims
-
1. A wireless communication frequency signal amplification apparatus, comprising:
-
a first path having at least one amplifier having a first semiconductor device at an output stage thereof;
a second path having an output lower than that of the first path, and the second path having at least one amplifier having a second semiconductor device formed to accomodate a smaller output than an output of the first semiconductor device at an output stage thereof;
a control circuit to control the paths so that the paths are operative one at a time;
a branching circuit on an input side and a branching circuit on an output side of the paths for branching an input signal into an operative one of the paths in accordance with a desired output level of the apparatus; and
a phase adjuster for adjusting a phase of the signal so that signal so that the phase of the signal through the first path when the first path is operative becomes substantially the same as the phase of the signal though the second path when the second path is operative. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A communication signal transmitting and receiving apparatus, comprising:
-
a first up converter electrically connected to an output of a base band portion for converting a base band signal from the base band portion into an intermediary frequency signal;
an second up converter electrically connected to an output of the first up converter for converting the intermediary signal from the first up converter into a wireless frequency signal and vice versa;
a first down converter electrically connected to an antenna for converting the wireless frequency signal from the antenna into an intermediary frequency signal;
a second down converter electrically connected between an output of the first down converter and an input of the base band portion for converting the intermediary frequency signal from the first down converter into a base signal to be inputted into the base band portion;
an amplifying device electrically connected between an output of the second up converter and the antenna for amplifying the wireless frequency signal from the second up converter to be sent to or received from an antenna, comprising;
a first path having at least one amplifier having a first semiconductor device at an output stage thereof;
a second path having an output lower than that of the first path, and the second path having at least one amplifier having a second semiconductor device formed to accommodate a smaller output than an output of the first semiconductor device at an output stage thereof;
a control circuit to control the paths so that the paths are operative one at a time;
a branching circuit on an input side and a branching circuit on an output side of the paths for branching an input signal into an operative one of the paths in accordance with a desired output level of the apparatus; and
a phase adjuster for adjusting a phase of the signal so that the phase of the signal through the first path when the first path is operative becomes substantially the same as the phase of the signal through the second path when the second path is operative. - View Dependent Claims (15, 16)
-
-
17. A dual-band and/or dual-mode portable communication terminal including two sets of communication signal transmitting and receiving apparatus, each of which comprising:
-
a first up converter electrically connected to an output of a base band portion for converting a base band signal from the baaase band portion into an intermediary frequency signal and vice versa;
an second up converter electrically connected to an output of the first up converter for converting the intermediary signal from the first up converter into a wireless frequency signal and vice versa;
a first down converter electrically connected to an antenna for converting the wireless frequency signal from the antenna into an intermediary frequency signal;
a second down converter electrically connected between an output of the first down converter and an input of the base band portion for converting the intermediary frequency signal from the first down converter into a base band signal to be inputted into the base band portion;
an amplifying device electrically connected between an output of the second up converter and the antenna for amplifying the wireless frequency signal from the second up converter to be sent to or received from an antenna, comprising;
a first path having at least one amplifier having a first semiconductor device at an output stage thereof;
a second path having an output lower than that of the first path, and the second path having at least one amplifier having a second semiconductor device formed to accommodate a smaller output than an output of the first semiconductor device at an output stage thereof;
a control circuit to control the paths so that the paths are operative one at a time;
a branching circuit on an input side of the paths and a branching circuit on an output side of the paths for branching an input signal into an operative one of the paths in accordance with a desired output level of the apparatus; and
a phase adjuster for adjusting a phase of the signal so that phase of the signal through the first path when the first path is operative becomes substantially the same as the phase of the signal through the second path when the second path is operative. - View Dependent Claims (18, 19)
-
Specification