US 10,389,317 B2Granted

Differential amplifier circuit and radar device

AssigneePanasonic Intellectual Property Management Co., Ltd.

InventorsToshiaki Ozeki, Jun'ichi Naka

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Abstract

A differential amplifier circuit comprises: first and second input terminals; first and second output terminals; a first transistor comprising a gate terminal connected to the first input terminal; a second transistor comprising a gate terminal connected to the second input terminal; a first resistor connected between the source terminal of the first transistor and the source terminal of the second transistor; a third transistor comprising a drain terminal connected to the source terminal of the first transistor, a gate terminal connected to the drain terminal of the first transistor, and a source terminal connected to the first output terminal; a fourth transistor comprising a drain terminal connected to the source terminal of the second transistor, a gate terminal connected to the drain terminal of the second transistor, and a source terminal connected to the second output terminal; first to fourth current sources; and second and third resistors.

Claims16

Dependent claims

A differential amplifier circuit comprising:

first and second input terminals that receive differential input voltages;
first and second output terminals that output output voltages;
a first transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the first input terminal;
a second transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the second input terminal;
a first resistor connected between the source terminal of the first transistor and the source terminal of the second transistor;
a third transistor comprising a drain terminal connected to the source terminal of the first transistor, a gate terminal connected to the drain terminal of the first transistor, and a source terminal connected to the first output terminal;
a fourth transistor comprising a drain terminal connected to the source terminal of the second transistor, a gate terminal connected to the drain terminal of the second transistor, and a source terminal connected to the second output terminal;
a first current source connected between the source terminal of the first transistor and a power-supply voltage;
a second current source connected between the source terminal of the second transistor and the power-supply voltage;
a second resistor comprising a first terminal connected to the source terminal of the third transistor;
a third resistor comprising a first terminal connected to the source terminal of the fourth transistor;
a third current source connected between the drain terminal of the first transistor and a ground;
and
a fourth current source connected between the drain terminal of the second transistor and the ground.

11 more elements

A radar device comprising:

an antenna that receives a radar signal;
an RF signal processing circuit that converts the radar signal received by the antenna into an intermediate-frequency signal;
and
a differential amplifier circuit, wherein
the differential amplifier circuit comprises:
first and second input terminals that receive the intermediate-frequency signal from the RF signal processing circuit as differential input voltages;
first and second output terminals that output output voltages;
a first transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the first input terminal;
a second transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the second input terminal;
a first resistor connected between the source terminal of the first transistor and the source terminal of the second transistor;
a third transistor comprising a drain terminal connected to the source terminal of the first transistor, a gate terminal connected to the drain terminal of the first transistor, and a source terminal connected to the first output terminal;
a fourth transistor comprising a drain terminal connected to the source terminal of the second transistor, a gate terminal connected to the drain terminal of the second transistor, and a source terminal connected to the second output terminal;
a first current source connected between the source terminal of the first transistor and a power-supply voltage;
a second current source connected between the source terminal of the second transistor and the power-supply voltage;
a second resistor comprising a first terminal connected to the source terminal of the third transistor;
a third resistor comprising a first terminal connected to the source terminal of the fourth transistor;
a third current source connected between the drain terminal of the first transistor and a ground;
and
a fourth current source connected between the drain terminal of the second transistor and the ground.

16 more elements

A differential amplifier circuit comprising:

first and second input terminals that receive differential input voltages;
first and second output terminals that output output voltages;
a first transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the first input terminal;
a second transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the second input terminal;
a first resistor connected between the source terminal of the first transistor and the source terminal of the second transistor;
a third transistor comprising a source terminal connected to the source terminal of the first transistor, a gate terminal connected to the drain terminal of the first transistor, and a drain terminal connected to the first output terminal;
a fourth transistor comprising a source terminal connected to the source terminal of the second transistor, a gate terminal connected to the drain terminal of the second transistor, and a drain terminal connected to the second output terminal;
a first current source connected between the source terminal of the first transistor and a power-supply voltage;
a second current source connected between the source terminal of the second transistor and the power-supply voltage;
a second resistor comprising a first terminal connected to the drain terminal of the third transistor;
a third resistor comprising a first terminal connected to the drain terminal of the fourth transistor;
a third current source connected between the drain terminal of the first transistor and a ground;
and
a fourth current source connected between the drain terminal of the second transistor and the ground.

11 more elements

A radar device comprising:

an antenna that receives a radar signal;
an RF signal processing circuit that converts the radar signal received by the antenna into an intermediate-frequency signal;
and
a differential amplifier circuit, wherein
the differential amplifier circuit comprises:
first and second input terminals that receive the intermediate-frequency signal from the RF signal processing circuit as differential input voltages;
first and second output terminals that output output voltages;
a first transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the first input terminal;
a second transistor comprising a source terminal, a drain terminal, and a gate terminal that is connected to the second input terminal;
a first resistor connected between the source terminal of the first transistor and the source terminal of the second transistor;
a third transistor comprising a source terminal connected to the source terminal of the first transistor, a gate terminal connected to the drain terminal of the first transistor, and a drain terminal connected to the first output terminal;
a fourth transistor comprising a source terminal connected to the source terminal of the second transistor, a gate terminal connected to the drain terminal of the second transistor, and a drain terminal connected to the second output terminal;
a first current source connected between the source terminal of the first transistor and a power-supply voltage;
a second current source connected between the source terminal of the second transistor and the power-supply voltage;
a second resistor comprising a first terminal connected to the drain terminal of the third transistor;
a third resistor comprising a first terminal connected to the drain terminal of the fourth transistor;
a third current source connected between the drain terminal of the first transistor and a ground;
and
a fourth current source connected between the drain terminal of the second transistor and the ground.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/465,583Filed 21 Mar 2017
Priority: JP 2016-08649222 Apr 2016
Published: US 2017/0310292 A126 Oct 2017
Granted: 20 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H03F 3/45251
Using MOSFET transistors as the active amplifying circuit: complementary Pl types having parallel inputs and being supplied in series
H03F 3/193
With semiconductor devices only: with field-effect devices
H03F 3/45197
Using MOSFET transistors as the active amplifying circuit: pl types
H03F 3/45659
Measuring at the loading circuit of the differential amplifier: controlling the loading circuit of the differential amplifier