US 10,771,046 B2Granted

Comparator and oscillator circuit using said comparator

AssigneeFuji Electric Co., Ltd.

InventorKenji Nakagomi

Life of this patent

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Abstract

Oscillator circuit uses a comparator, and controls charge-discharge of Miller capacitance between gate and drain of a MOSFET serving as an amplifier of the comparator gain unit and gate capacitance of the MOSFET, and enables comparator output to follow a high-frequency control signal that is input externally. An oscillator circuit uses a comparator CMP having differential and gain units. This oscillator circuit includes: a charge-discharge controller to control charge-discharge of Miller capacitance between gate and drain of a MOSFET and gate capacitance of the MOSFET; and an output controller to control output of the gain unit. Output controller includes: an inverter to connect to an input of the differential unit and receive a control signal input; a logic circuit to receive output of the inverter and output of the gain unit as an input; a transistor; and a capacitor to connect to input and output of the logic circuit.

Claims9

Dependent claims

A comparator having a differential unit and a gain unit, comprising:

a charge-discharge control unit configured to connect to an output of the differential unit and configured to control charge-discharge of Miller capacitance between the gate and the drain of a MOSFET serving as an amplifier of the gain unit and gate capacitance of the MOSFET;
and
an output control unit configured to control an output of the gain unit,
a signal generated at an external terminal of the comparator being input to one of the inputs of the differential unit,
the output control unit including:
a first inverter configured to receive a signal generated at the external terminal as an input;
a first logic circuit configured to receive the output of the first inverter and the output of the gain unit as an input;
a first transistor having a drain configured to connect to the output of the gain unit, a source configured to connect to a reference potential of the comparator, and a gate configured to connect to the output of the first logic circuit;
and
a first capacitor configured to connect to the input and the output of the first logic circuit.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/700,386Filed 2 Dec 2019 · continuation
Priority: JP 2017-24072315 Dec 2017
Published: US 2020/0106427 A12 Apr 2020
Granted: 8 Sep 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H03K 5/08
Shaping pulses: by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
H03F 3/45
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements: differential amplifiers
H03K 3/0231
By the use of differential amplifiers or comparators, with internal or external positive feedback: astable circuits
H03K 3/353
Generators characterised by the type of circuit or by the means used for producing pulses: by the use, as active elements, of field-effect…

Family

PCT/JP2018/040507Parent of this continuation · filed 31 Oct 2018
US 2020/0106427 A1Pre-grant publication · published 2 Apr 2020
US 10,771,046 B2This patent

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

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