| 发明名称 | Power amplifier | ||
| 摘要 | A power amplifier includes an amplification transistor which performs power amplification, a bias circuit which outputs a bias voltage to a base of the amplification transistor, a control terminal to which a control voltage is applied for controlling switching between an operating state and a stopping state of the bias circuit, and a bias voltage adjustment circuit connected to the control terminal. The bias voltage adjustment circuit includes a variable capacitance element which is connected to the control terminal and whose capacitance value decreases as the control voltage increases, a discharge circuit which discharges electric charge accumulated in the variable capacitance element to the control terminal, and a control circuit which is connected to the bias circuit and controls the bias voltage. The bias voltage adjustment circuit outputs, to the bias circuit, a bias voltage adjustment signal which increases the bias voltage for a predetermined period after the control voltage is applied. | ||
| 申请公布号 | US9374039(B2) | 申请公布日期 | 2016.06.21 |
| 申请号 | US201514951071 | 申请日期 | 2015.11.24 |
| 申请人 | PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. | 发明人 | Kamitani Masatoshi;Wakita Kazuya;Enomoto Shingo;Seki Masato |
| 分类号 | H03G3/30;H03F1/30;H03F1/02;H03F3/19;H03F3/21 | 主分类号 | H03G3/30 |
| 代理机构 | McDermott Will & Emery LLP | 代理人 | McDermott Will & Emery LLP |
| 主权项 | 1. A power amplifier comprising: an amplification transistor which performs power amplification; a bias circuit which outputs a bias voltage to a base of the amplification transistor; a control terminal to which a control voltage is applied for controlling switching between an operating state and a stopping state of the bias circuit; and a bias voltage adjustment circuit connected to the control terminal, wherein the bias voltage adjustment circuit includes: a variable capacitance element which is connected to the control terminal and whose capacitance value decreases as the control voltage increases;a discharge circuit which discharges electric charge accumulated in the variable capacitance element to the control terminal; anda control circuit which is connected to the bias circuit and controls the bias voltage, and the bias voltage adjustment circuit outputs, to the bias circuit, a bias voltage adjustment signal which increases the bias voltage for a predetermined period after the control voltage is applied. | ||
| 地址 | Osaka JP | ||