# US 11,309,833 B2 · LC oscillator capable of temperature compensation

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- Number: US 11,309,833 B2
- Document ID: US11309833B2
- Status: Granted
- Kind: B2
- Application number: 16/860,661
- Filed: 2020-04-28
- Published: 2020-11-05
- Granted: 2022-04-19
- Earliest claimed: 2019-05-02
- Assignees: Wavepia Co., Ltd.
- Applicants: Wavepia Co., Ltd.
- Inventors: Sang-Hun Lee
- Web page: https://patentgrep.com/patent/US11309833B2

## CPC

- H03B 5/04: Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
- H03B 5/1212: {the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair}
- H03B 5/1215: {the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair}
- H03B 5/1228: {the amplifier comprising one or more field effect transistors}
- H03B 5/1243: {the means comprising voltage variable capacitance diodes}
- H03B 5/1265: {switched capacitors}
- H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H)

## Abstract

An LC oscillator capable of temperature compensation includes a differential voltage supplier providing a positive differential voltage to a positive node and a negative differential voltage to a negative node and a differential oscillation frequency signal output unit outputting a positive oscillation frequency signal using the positive differential voltage provided to the positive node by the differential voltage supplier and a negative oscillation frequency signal using the negative differential voltage provided to the negative node by the differential voltage supplier.

## Claims

### Claim 1

An LC oscillator capable of temperature compensation, comprising:
a differential voltage supplier configured to provide a positive differential voltage to a positive node and provide a negative differential voltage to a negative node; and
a differential oscillation frequency signal output unit configured to output a positive oscillation frequency signal using the positive differential voltage provided to the positive node by the differential voltage supplier and output a negative oscillation frequency signal using the negative differential voltage provided to the negative node by the differential voltage supplier,
wherein the differential oscillation frequency signal output unit comprises:
an inductor connected between the positive node and the negative node;
a positive basic capacitor connected to the positive node;
a negative basic capacitor connected between the positive basic capacitor and the negative node, wherein the positive basic capacitor and the negative basic capacitor are connected through transistors enabled by an output enable signal, wherein transistors comprise only first and second transistors;
a first positive varactor connected to the positive node and varied by a first control voltage; and
a first negative varactor connected between the first positive varactor and the negative node and varied by the first control voltage.

### Claim 2 (depends on 1)

The LC oscillator of claim 1, wherein the first control voltage is increased when a temperature is higher than a reference temperature.

### Claim 3

An LC oscillator capable of temperature compensation, comprising
a differential voltage supplier configured to provide a positive differential voltage to a positive node and provide a negative differential voltage to a negative node and a differential oscillation frequency signal output unit configured to output a positive oscillation frequency signal using the positive differential voltage provided to the positive node by the differential voltage supplier and output a negative oscillation frequency signal using the negative differential voltage provided to the negative node by the differential voltage supplier,
wherein the differential oscillation frequency signal output unit comprises:
an inductor connected between the positive node and the negative node;
a positive basic capacitor connected to the positive node;
a negative basic capacitor connected between the positive basic capacitor and the negative node, wherein the positive basic capacitor and the negative basic capacitor are connected through transistors enabled by an output enable signal, wherein transistors comprise only first and second transistors;
a first positive varactor connected to the positive node and varied by a first control voltage;
a first negative varactor connected between the first positive varactor and the negative node and varied by the first control voltage;
a second positive varactor connected to the positive node and varied by a second control voltage; and
a second negative varactor connected between the second positive varactor and the negative node and varied by the second control voltage.

### Claim 4 (depends on 3)

The LC oscillator of claim 3, wherein a variable range of the second positive varactor is smaller than a variable range of the first positive varactor.

### Claim 5 (depends on 3)

The LC oscillator of claim 3, wherein a variable range of the second negative varactor is smaller than a variable range of the first negative varactor.

### Claim 6 (depends on 3)

The LC oscillator of claim 3, wherein the first control voltage is increased when a temperature is higher than a reference temperature.

### Claim 7 (depends on 3)

The LC oscillator of claim 3, wherein the second control voltage is increased when a temperature is higher than a reference temperature.

### Claim 8 (depends on 3)

The LC oscillator of claim 3, wherein the first and second transistors are NMOS transistors.

### Claim 9 (depends on 1)

The LC oscillator of claim 1, wherein the first and second transistors are NMOS transistors.

### Claim 10

An LC oscillator capable of temperature compensation, comprising:
a differential voltage supplier configured to provide a positive differential voltage to a positive node and provide a negative differential voltage to a negative node; and
a differential oscillation frequency signal output unit configured to output a positive oscillation frequency signal using the positive differential voltage provided to the positive node by the differential voltage supplier and output a negative oscillation frequency signal using the negative differential voltage provided to the negative node by the differential voltage supplier,
wherein the differential oscillation frequency signal output unit comprises:
an inductor connected between the positive node and the negative node;
a positive basic capacitor connected to the positive node;
a negative basic capacitor connected between the positive basic capacitor and the negative node, wherein the positive basic capacitor and the negative basic capacitor are connected through transistors enabled by an output enable signal, wherein transistors comprises first and second transistors, wherein the first transistor comprises a first source terminal and the second transistor comprises a second source terminal, wherein the first and second source terminals are directly connected to each other such that current is allowed to flow from the first source terminal to the second source terminal;
a first positive varactor connected to the positive node and varied by a first control voltage; and
a first negative varactor connected between the first positive varactor and the negative node and varied by the first control voltage.

### Claim 11 (depends on 10)

The LC oscillator of claim 10, wherein transistors comprise only first and second transistors.