Claims
- 1. A radio communication apparatus comprising:a first semiconductor chip including a first amplifying element having an input terminal and an output terminal, and a bias circuit which provides the input terminal of the first amplifying element with a bias voltage in accordance with a power control voltage; a second semiconductor chip including a second amplifying element having an input terminal to which a signal provided from the output terminal of the first amplifying element is supplied and an output terminal which provides an output signal to be supplied to an antenna; and a control circuit coupled to the bias circuit and to the input terminal of the second amplifying element and controlling a bias voltage to the input terminal of the second amplifying element, wherein the control circuit has a first mode and a second mode, and a changing rate in the bias voltage to be supplied to the input terminal of the second amplifying element for change in the power control voltage is different between the first mode and the second mode.
- 2. A radio communication apparatus according to claim 1, wherein the control circuit includes a third amplifying element having an input terminal and an output terminal which is coupled to the input terminal of the second amplifying element and to the bias circuit, and a resistance element coupled between the input terminal of the third amplifying element and the output terminal of the third amplifying element.
- 3. A radio communication apparatus according to claim 2, wherein the first semiconductor chip includes a fourth amplifying element having an input terminal to which a bias voltage from the bias circuit is supplied and an output terminal which provides an output signal to the input terminal of the first amplifying element.
- 4. A radio communication apparatus according to claim 3, wherein the control circuit is included in the second semiconductor chip.
- 5. A radio communication apparatus according to claim 4, wherein the first amplifying element, the second amplifying element, the third amplifying element and the fourth amplifying element are MOSFETs.
- 6. A radio communication apparatus according to claim 5, wherein the control circuit receives a control signal for indicating a mode of the control circuit.
- 7. A radio communication apparatus according to claim 6, wherein a voltage at the input terminal of the third amplifying element is changed in accordance with the control signal.
- 8. A radio communication apparatus according to claim 2, wherein the control circuit is included in the second semiconductor chip.
- 9. A radio communication apparatus according to claim 8, wherein the first amplifying element, the second amplifying element, the third amplifying element and the fourth amplifying element are MOSFETs.
- 10. A radio communication apparatus according to claim 9, wherein the control circuit receives a control signal for indicating a mode of the control circuit.
- 11. A radio communication apparatus according to claim 10, wherein a voltage at the input terminal of the third amplifying elemene is changed in accordance with the control signal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-244709 |
Aug 1998 |
JP |
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Parent Case Info
This is a continuation application of U.S Ser. No. 09/385,690, filed Aug. 30, 1999 now U.S Pat. No. 6,172,567.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
5-152978 |
Jun 1993 |
JP |
6-310954 |
Nov 1994 |
JP |
7-143506 |
Jun 1995 |
JP |
Non-Patent Literature Citations (1)
Entry |
Nikkei Electronics, Jan. 27, 1997, pp. 115-126 and English translation. |
Continuations (1)
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Number |
Date |
Country |
Parent |
09/385690 |
Aug 1999 |
US |
Child |
09/722563 |
|
US |