# US 2019/0173425 A1 · Wide band frequency oscillator circuit and oscillation method using ring voltage controlled oscillator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173425 A1 - Document ID: US20190173425A1 - Status: Published application - Kind: A1 - Application number: 16/158,352 - Filed: 2018-10-12 - Published: 2019-06-06 - Earliest claimed: 2017-12-04 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Seong Mo MOON; In Bok YOM - Web page: https://patentgrep.com/patent/US20190173425A1 ## CPC - H03B 5/124: {the means comprising a voltage dependent capacitance} - H03B 5/1293: {having means for achieving a desired tuning characteristic, e.g. linearising the frequency characteristic across the tuning voltage range} - H03B 5/1296: {the feedback circuit comprising a transformer} - H03K 3/0315: {Ring oscillators} - H03K 3/0322: {with differential cells} - 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) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) ## Abstract Disclosed is a wide band frequency oscillator circuit and oscillation method using a ring voltage-controlled oscillator (VCO). The frequency oscillator circuit includes a low drop-out (LDO) regulator configured to generate an input voltage of a ring VCO, and the ring VCO connected to the LDO regulator and configured to control an oscillation frequency based on the input voltage, wherein the LDO regulator includes a feedback adjustable resistor. ## Claims ### Claim 1 A frequency oscillator circuit, comprising: a low drop-out (LDO) regulator configured to generate an input voltage of a ring voltage-controlled oscillator (VCO); and the ring VCO connected to the LDO regulator and configured to control an oscillation frequency based on the input voltage, wherein the LDO regulator comprises a feedback adjustable resistor. ### Claim 2 (depends on 1) The frequency oscillator circuit of claim 1, wherein one side of the feedback adjustable resistor is connected to an output end of the LDO regulator to control the input voltage. ### Claim 3 (depends on 1) The frequency oscillator circuit of claim 1, wherein the ring VCO comprises a plurality of amplifiers connected in series. ### Claim 4 (depends on 3) The frequency oscillator circuit of claim 3, wherein at least one of the plurality of amplifiers comprises a voltage-controlled capacitor using a P-type metal oxide semiconductor (PMOS). ### Claim 5 (depends on 3) The frequency oscillator circuit of claim 3, wherein the plurality of amplifiers is configured to control the oscillation frequency using a plurality of input voltages. ### Claim 6 (depends on 5) The frequency oscillator circuit of claim 5, wherein the plurality of input voltages comprises at least one of: a first input voltage for coarse tuning of the oscillation frequency; and a second input voltage for fine tuning of the oscillation frequency. ### Claim 7 (depends on 6) The frequency oscillator circuit of claim 6, wherein at least one of the first input voltage and the second input voltage is an output voltage of the LDO regulator. ### Claim 8 A frequency oscillation method, comprising: generating an input voltage using a low drop-out (LDO) regulator; and controlling an oscillation frequency of a ring voltage-controlled oscillator (VCO) connected to the LDO regulator based on the input voltage, wherein the LDO regulator comprises a feedback adjustable resistor. ### Claim 9 (depends on 8) The frequency oscillation method of claim 8, wherein one side of the feedback adjustable resistor is connected to an output end of the LDO regulator, wherein the generating comprises controlling the input voltage by adjusting the feedback adjustable resistor. ### Claim 10 (depends on 8) The frequency oscillation method of claim 8, wherein the ring VCO comprises a plurality of amplifiers connected in series. ### Claim 11 (depends on 10) The frequency oscillation method of claim 10, wherein at least one of the plurality of amplifiers comprises a voltage-controlled capacitor using a P-type metal oxide semiconductor (PMOS). ### Claim 12 (depends on 9) The frequency oscillation method of claim 9, wherein the plurality of amplifiers is configured to control the oscillation frequency using a plurality of input voltages. ### Claim 13 (depends on 12) The frequency oscillation method of claim 12, wherein the controlling of the oscillation frequency comprises at least one of: performing coarse tuning of the oscillation frequency by adjusting a first input voltage; and performing fine tuning of the oscillation frequency by adjusting a second input voltage, wherein the plurality of input voltages comprises the first input voltage and the second input voltage. ### Claim 14 (depends on 13) The frequency oscillation method of claim 13, wherein at least one of the first input voltage and the second input voltage is an output voltage of the LDO regulator.