| 主权项 |
1. A power amplifier (PA) system configured to operate about a plurality of modes and a plurality of frequency bands, the PA system comprising:
an input port for inputting input signals that are processed in the PA system to generate output signals; an output port that outputs the output signals in a mode selected from the plurality of modes and in a frequency band selected from the plurality of frequency bands during a time interval, wherein the output signals vary with time; one or more amplifying modules, each amplifying module comprising a plurality of banks, each of the banks comprising one or more transistors, wherein each of the banks is configured to have an input terminal and amplify power of signals to a predetermined level; a plurality of matching modules, each matching module being configured to be adjusted to provide an impedance corresponding to the frequency band and conditions, wherein the number of the plurality of matching modules is one more than the number of the one or more amplifying modules, and the plurality of matching modules and the one or more amplifying modules are coupled alternately in series having a first matching module coupled to the input port of one of the one or more amplifying modules and a last matching module coupled to the output port of the one or another of the amplifying modules; and a controller coupled to the input terminal of each of the banks and to the plurality of matching modules through a bidirectional control line; at least one of the matching modules comprising:
a signal path extending from a first port of the matching module to a second port thereof;a first switch coupled to the signal path;one or more second switches;a plurality of first microstrips coupled in parallel, each of the first microstrips having one end coupled to the signal path and the other end coupled to the first switch, wherein the plurality of first microstrips are configured to provide first impedances corresponding to respective frequency bands; anda plurality of second microstrips coupled in series through the one or more second switches, wherein the number of the plurality of second microstrips is one more than the number of the one or more second switches, the plurality of second microstrips and the one or more second switches are coupled alternately in series to form a shunt stub having one end coupled to the signal path and the other end being ground or short, and an electrical length of the shunt stub is adjusted by switching on and off the one or more second switches to provide second impedances corresponding to respective frequency bands,whereinthe controller controls the first switch to select one of the plurality of first microstrips to provide the first impedance corresponding to the frequency band during the time interval, and controls the one or more second switches to obtain the electrical length that provides the second impedance corresponding to the frequency band during the time period,and whereina combination of the first impedance and the second impedance provides the impedance for the frequency band during the time interval; the PA system being further characterized in that: the controller receives information on the output signals and the conditions, and based on the information the controller controls the input terminal of each of the banks to select one of the banks from each amplifying module in a predetermined series to turn on the selected banks in the series and adjusts the plurality of matching modules, wherein the matching module coupled to receive signals from a last bank of the selected banks in the series is coupled to the output port, and wherein the controller controls the input terminal of each of the banks and adjusts the matching modules variably with time as the information varies to provide a signal path that has the selected banks and the adjusted matching modules to meet specifications on properties associated with the output signals during each time interval. |
