US 11,637,549 B2Granted

Replica circuit and oscillator including the same

AssigneeSK hynix Inc.

InventorByung Guk Kim

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Abstract

The present technology includes a replica circuit and an oscillator including the same. The replica circuit includes a first terminal to which a replica voltage having a positive voltage is supplied, a second terminal to which a ground voltage is supplied, a replica main circuit connected between the first terminal and the second terminal and configured to form a first current path in response to the replica voltage, and a replica sub circuit connected in parallel with the replica main circuit between the first terminal and the second terminal and configured to form a second current path in response to the replica voltage. A current flowing through the second current path having a replica sub current amount is less than a current flowing through the first current path having a replica main current amount.

Claims20

Dependent claims

A replica circuit comprising:

a first terminal to which a replica voltage having a positive voltage is supplied;
a second terminal to which a ground voltage is supplied;
a replica main circuit connected between the first terminal and the second terminal and configured to form a first current path in response to the replica voltage, in order to replicate a current of a main circuit that generates a sub clock and an inverted sub clock in a voltage controlled oscillator;
and
a replica sub circuit connected in parallel with the replica main circuit between the first terminal and the second terminal and configured to form a second current path in response to the replica voltage, in order to replicate a current of a sub circuit for reducing noise of the sub clock and the inverted sub clock in the voltage controlled oscillator,
wherein the replica main circuit is configured so that a current flowing through the first current path has a replica main current amount, and
wherein the replica sub circuit is configured so that a current flowing through the second current path has a replica sub current amount less than the replica main current amount.

4 more elements

An oscillator comprising:

a voltage controlled oscillator operable according to a control voltage and including:
a main circuit configured to generate a clock and an inverted clock by inverting an input signal and an inverted input signal, respectively;
and
a sub circuit configured to reduce noise of the clock and the inverted clock;
a replica circuit operable according to a replica voltage and including:
a replica main circuit configured to replicate a voltage or a current of the main circuit;
and
a replica sub circuit configured to replicate a voltage or a current of the sub circuit;
and
an amplifier configured to output an amplified voltage to the voltage controlled oscillator and the replica circuit by amplifying a difference between a reference voltage and the replica voltage so that the replica voltage and the control voltage are equal to each other,
wherein the voltage controlled oscillator is configured to adjust the control voltage in response to the amplified voltage, and the replica circuit is configured to maintain a level of the replica voltage in response to the amplified voltage, and
wherein the level of the replica voltage is adjusted according to a size of switches configuring the replica main circuit and the replica sub circuit.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/475,607Filed 15 Sep 2021
Priority: KR 10-2021-00442775 Apr 2021
Published: US 2022/0321109 A16 Oct 2022
Granted: 25 Apr 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03K 3/0322
Ring oscillators: with differential cells
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…
H03K 17/6872
The output circuit comprising more than one controlled field-effect transistor: using complementary field-effect transistors
H03L 7/0995
Concerning mainly the controlled oscillator of the loop: the oscillator comprising a ring oscillator