Title:
POWER AMPLIFICATION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2021/124613
Kind Code:
A1
Abstract:
The present invention improves the linearity of an input power-output power characteristic of an amplification circuit. A power amplification circuit (1) is provided with an amplification circuit (2), a bias circuit (3), a detection unit (4), and a control circuit (5). The amplification circuit (2) includes a first bipolar transistor (Tr2). An emitter follower (30) of the bias circuit (3) includes a second bipolar transistor (Tr3). The emitter follower (30) supplies a bias current to a base of the first bipolar transistor (Tr2). The detection unit (4) detects a voltage (Vcc) at a power supply terminal (11) connected to a collector of the first bipolar transistor (Tr2). The control circuit (5) includes a current limiting circuit (54) provided between a battery terminal (12) and a collector of the second bipolar transistor (Tr3). The control circuit (5), in accordance with the voltage detected by the detection unit (4), modifies an upper limit value of a control current (Ice) supplied to the collector of the second bipolar transistor (Tr3).
Inventors:
HIROBE MASAKAZU
Application Number:
PCT/JP2020/032730
Publication Date:
June 24, 2021
Filing Date:
August 28, 2020
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03F3/24; H03F1/32
Foreign References:
| JP2019176454A | 2019-10-10 | |||
| JP2010074542A | 2010-04-02 | |||
| JP2009253918A | 2009-10-29 | |||
| JP2002009558A | 2002-01-11 |
Attorney, Agent or Firm:
HOKUTO PATENT ATTORNEYS OFFICE (JP)
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