# US 2019/0356268 A1 · Circuit with shunt path > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0356268 A1 - Document ID: US20190356268A1 - Status: Published application - Kind: A1 - Application number: 15/983,041 - Filed: 2018-05-17 - Published: 2019-11-21 - Earliest claimed: 2018-05-17 - Assignees: Microsoft Technology Licensing, LLC - Applicants: Microsoft Technology Licensing, LLC - Inventors: Julia Jacinta BUSONO; Jack Thomas LAVIER; Robert Glenn RUNDELL - Web page: https://patentgrep.com/patent/US20190356268A1 ## CPC - H03B 5/04: Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature - H03B 5/364: {the amplifier comprising field effect transistors (H03B5/366 takes precedence)} - H03H 7/06: including resistors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) - H03B 5/1206: {using multiple transistors for amplification} - H03B 2200/0012: Pierce oscillator - H03B 2200/0092: Measures to linearise or reduce distortion of oscillator characteristics - 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) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract Examples are disclosed that relate to oscillator circuits. One example provides a circuit comprising an amplifier, a resonator in parallel with the amplifier, and a shunt path including one or more circuit elements, the shunt path coupled to a first node downstream of an output of the amplifier and to a second node, the shunt path configured to shunt current received at the first node away from an input of the resonator and toward the second node, the second node having, at steady state, a relatively lower voltage than an input voltage of the resonator. ## Claims ### Claim 1 A circuit, comprising: an amplifier; a resonator in parallel with the amplifier; and a shunt path including one or more circuit elements, the shunt path coupled to a first node downstream of an output of the amplifier and to a second node, the shunt path configured to shunt current received at the first node away from an input of the resonator and toward the second node, the second node having, at steady state, a relatively lower voltage than an input voltage of the resonator. ### Claim 2 (depends on 1) The circuit of claim 1, further comprising a resistor in parallel with the amplifier. ### Claim 3 (depends on 1) The circuit of claim 1, where the one or more circuit elements include a resistor. ### Claim 4 (depends on 3) The circuit of claim 3, where a resistance of the resistor is selected based on a dissipation current associated with the resonator, such that, with the dissipation current dissipated by the resistor, a non-overdrive condition of the resonator is satisfied. ### Claim 5 (depends on 3) The circuit of claim 3, where the resistance is further selected based on a common-mode voltage requirement of the amplifier. ### Claim 6 (depends on 3) The circuit of claim 3, where the one or more circuit elements include a capacitor. ### Claim 7 (depends on 6) The circuit of claim 6, where a capacitance of the capacitor is selected to minimize an impedance of the capacitor at an oscillation frequency of the circuit. ### Claim 8 (depends on 6) The circuit of claim 6, where the capacitor substantially eliminates a DC path to the second node. ### Claim 9 (depends on 6) The circuit of claim 6, where the resistor and the capacitor form a high-pass filter. ### Claim 10 (depends on 6) The circuit of claim 6, where the one or more circuit elements include a switch operable to electrically disconnect the second node from the one or more circuit elements and thereby disable shunting of the current received at the first node away from the input of the resonator and toward the second node until steady state is reached. ### Claim 11 (depends on 10) The circuit of claim 10, where the switch includes a MOSFET. ### Claim 12 (depends on 10) The circuit of claim 10, where the amplifier and the resonator form an oscillator, and where the switch is controlled by a signal produced by the oscillator. ### Claim 13 (depends on 1) The circuit of claim 1, where the second node is a ground node. ### Claim 14 A circuit, comprising: an amplifier; a resonator in parallel with the amplifier; and a shunt path including a resistor, the shunt path coupled to a first node downstream of an output of the amplifier and to a second node, the shunt path configured to shunt current received at the first node away from an input of the resonator and toward the second node, the second node having, at steady state, a relatively lower voltage than an input voltage of the resonator. ### Claim 15 (depends on 14) The circuit of claim 14, where a resistance of the resistor is selected based on a dissipation current associated with the resonator, such that, with the dissipation current dissipated by the resistor, a non-overdrive condition of the resonator is satisfied. ### Claim 16 (depends on 14) The circuit of claim 14, where the shunt path includes a capacitor. ### Claim 17 (depends on 14) The circuit of claim 14, where the shunt path includes a switch operable to electrically disconnect the second node from the resistor and the capacitor and thereby disable shunting of the current received at the first node away from the input of the resonator and toward the second node until steady state is reached. ### Claim 18 (depends on 17) The circuit of claim 17, where the amplifier and the resonator form an oscillator, and where the switch is controlled by a signal produced by the oscillator. ### Claim 19 A circuit, comprising: an amplifier; a resonator in parallel with the amplifier; and a shunt path including one or more circuit elements, the shunt path coupled to a first node downstream of an output of the amplifier and to a second node, the shunt path configured to limit current supply to the resonator by shunting current away from an input of the resonator and toward the second node, such that the current shunted away from the input of the resonator results in a drive level of the resonator that satisfies a non-overdrive condition of the resonator. ### Claim 20 (depends on 19) The circuit of claim 19, where the one or more circuit elements include: a resistor; a capacitor; and a switch operable to electrically disconnect the second node from the one or more circuit elements and thereby disable shunting of the current away from the input of the resonator and toward the second node until steady state is reached.