US 11,444,575 B2Granted

Bias circuit

AssigneeSumitomo Electric Industries, Ltd.

InventorsHideki Tango, Tatsuya Hashinaga, Harutoshi Tsuji

Life of this patent

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Abstract

Included are: a first power source 3 configured to output a voltage required for a first gate bias voltage for turning a power amplifier 2 to an ON state; a second power source 4 configured to output a voltage required for a second gate bias voltage for turning the power amplifier 2 to an OFF state; a changeover switch 5 connected between the first power source 3 and the power amplifier 2 and configured to supply either the first gate bias voltage or the second gate bias voltage to the power amplifier 2 by switching a state between the first power source 3 and the power amplifier 2 to either an open state or a short-circuit state on the basis of a control signal related to on-off control of the power amplifier 2; and a resistance value varying unit 15 connected between the second power source 4 and the power amplifier 2 and configured such that a resistance value thereof is variable.

Claims3

Dependent claims

A bias circuit configured to supply a gate bias voltage for performing on-off control of an amplifier, to the amplifier, the bias circuit comprising:

a first power source connected in series to a gate terminal of the amplifier and configured to output a voltage required for a first gate bias voltage for turning the amplifier to an ON state;
a second power source connected in series to the gate terminal of the amplifier and configured to output a voltage required for a second gate bias voltage for turning the amplifier to an OFF state;
a changeover switch connected between the first power source and the amplifier and configured to supply either the first gate bias voltage or the second gate bias voltage to the amplifier by switching a state between the first power source and the amplifier to either an open state or a short-circuit state on the basis of a control signal related to on-off control of the amplifier;
a resistor connected between the second power source and the amplifier to protect the second power source;
and
an on/off switch connected between one end and the other end of the resistor and configured to short-circuit or open both ends of the resistor on the basis of the control signal.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/147,845Filed 13 Jan 2021 · continuation
Published: US 2021/0135629 A16 May 2021
Granted: 13 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H03F 1/0211
In transistor amplifiers: with control of the supply voltage or current
H03F 3/245
Of transmitter output stages: with semiconductor devices only
H03F 1/30
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements: modifications of…
H03F 1/301
Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters: in MOSFET amplifiers

Family

PCT/JP2017/006612Parent of this continuation · filed 22 Feb 2017
US 2021/0135629 A1Pre-grant publication · published 6 May 2021
Application16/480,754Parent of this continuation
US 10,924,064 B2Parent of this continuation
US 2019/0393840 A1Published application
US 11,444,575 B2This patent

From the US filing history. Foreign family members aren’t listed.

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