US 12,597,897 B2Granted

Differential amplifying apparatus

AssigneeMurata Manufacturing Co., Ltd.

InventorsMasafumi Kazuno, Kenji Mukai

Life of this patent

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Abstract

A differential amplifying apparatus includes an input matching circuit serving as an input balun to which a signal inputted to an input terminal is input, an output matching circuit serving as an output balun that outputs a signal to an output terminal, first and second amplifiers provided in parallel between the input balun and the output balun and configured to output a differential signal, a diode provided between a reference potential and a path between the input balun and the first amplifier, a second diode provided between a reference potential and a path between the input balun and the second amplifier, and a bias circuit that applies a bias to the first diode and the second diode, in which a cathode of the first diode and a cathode of the second diode are connected to the reference potential side.

Claims8

Dependent claims

A differential amplifying apparatus comprising:

an input terminal;
an input balun to which a signal input to the input terminal is input;
an output terminal;
an output balun configured to output a signal to the output terminal;
first and second amplifiers connected in parallel with each other between the input balun and the output balun, the first and second amplifiers being configured to output a differential signal;
a first diode between a reference potential and a first path connecting the input balun to the first amplifier, and configured to allow current to flow from the first path to ground;
a second diode between the reference potential and a second path connecting the input balun to the second amplifier, and configured to allow current to flow from the second path to ground;
and
a bias circuit configured to apply a bias to the first diode and to the second diode,
wherein a cathode of the first diode and a cathode of the second diode are connected to the reference potential, and
wherein the input balun comprises a transformer with a primary winding and a secondary winding.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/051,665Filed 1 Nov 2022
Priority: JP 2021-1792192 Nov 2021
Published: US 2023/0134242 A14 May 2023
Granted: 7 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H03F 3/45475
Characterised by the way of implementation of the active amplifying circuit in the differential amplifier: using IC blocks as the active…
H03F 1/565
Modifications of input or output impedances, not otherwise provided for: using inductive elements
H03F 3/26
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements: push-pull amplifiers; Phase-splitters therefor
H03F 2200/06
Indexing scheme relating to amplifiers: a balun, i.e. balanced to or from unbalanced converter, being present at the input of an amplifier