# US 11,121,675 B2 · Remotely powered low power oscillator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,675 B2 - Document ID: US11121675B2 - Status: Granted - Kind: B2 - Application number: 16/726,465 - Filed: 2019-12-24 - Published: 2021-06-24 - Granted: 2021-09-14 - Earliest claimed: 2019-12-24 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Sudipto Chakraborty; Rajiv Joshi; Steven J. Holmes; Bruce B. Doris - Web page: https://patentgrep.com/patent/US11121675B2 ## CPC - 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 5/04: Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature - H03B 5/1228: {the amplifier comprising one or more field effect transistors} - H03B 5/1243: {the means comprising voltage variable capacitance diodes} - H03B 5/1278: {the parameter being an amplitude of a signal, e.g. maintaining a constant output amplitude over the frequency range} - H03L 1/00: Stabilisation of generator output against variations of physical values, e.g. power supply - H03L 5/00: Automatic control of voltage, current, or power - 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) - H03L: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B) ## Abstract A remotely powered low power oscillator. According to an embodiment of the present invention, a method comprises an oscillator core, in a first environment, generating an oscillating signal; a power management system, in a second environment, supplying power to the oscillator core to operate the oscillator core; a sensing system, in the first environment, sensing one or more parameters of the oscillator core, and generating one or more signals representing said one or more parameters; transmitting the one or more signals from the sensing system to the second environment; and using the one or more signals in the second environment to control the power supplied to the oscillator core from the power management system. ## Claims ### Claim 1 A method comprising: an oscillator core, in a first environment, generating an oscillating signal; a power management system, in a second environment, supplying power to the oscillator core to operate the oscillator core, including supplying the power from a voltage source to the oscillator core via a pass transistor by applying a current output of the pass transistor to the oscillator core; a sensing system, in the first environment, sensing one or more parameters of the oscillator core that are dependent on a temperature of the oscillator core, and generating one or more temperature dependent signals representing said temperature of the oscillator core; transmitting the one or more temperature dependent signals representing the temperature of the oscillator core from the sensing system to the second environment; and using in the second environment, the one or more temperature dependent signals representing the temperature of the oscillator core to generate a reference signal, and using the generated reference signal to determine the power supplied to the oscillator core from the power management system, including applying an output of an error amplifier to a gate of the pass transistor to control the current output of the pass transistor and the power supplied by the power management system to the oscillator core to operate the oscillator core, wherein the using the one or more temperature dependent signals to generate a reference signal includes: applying the one or more temperature dependent signals to a peak voltage detector in the second environment to generate a peak voltage signal in the second environment representing the temperature of the oscillator core. ### Claim 2 (depends on 1) The method according to claim 1, wherein: the transmitting the one or more signals from the sensing system to the second environment includes using DC communications between the first environment and the second environment to communicate the one or more signals to the second environment; and the supplying power to the oscillator core to operate the oscillator core includes using the DC communications between the first environment and the second environment to supply the power to the oscillator core. ### Claim 3 (depends on 1) The method according to claim 1, wherein the sensing system sensing one or more parameters of the oscillator core includes the sensing system sensing the one or more parameters of the oscillator core via a direct electrical coupling of the sensing system to the oscillator core. ### Claim 4 (depends on 1) The method according to claim 1, wherein the sensing system sensing one or more parameters of the oscillator core includes the sensing system sensing the one or more parameters of the oscillator core via a scaled electrical coupling of the sensing system to the oscillator core. ### Claim 5 (depends on 1) The method according to claim 1, wherein the sensing system sensing one or more parameters of the oscillator core includes the sensing system sensing the one or more parameters of the oscillator core via a magnetic coupling of the sensing system to the oscillator core. ### Claim 6 (depends on 1) The method according to claim 1, wherein the sensing system sensing one or more parameters of the oscillator core includes the sensing system sensing the one or more parameters of the oscillator core via a capacitive coupling of the sensing system to the oscillator core. ### Claim 7 (depends on 1) The method according to claim 1, wherein: the oscillator core generates an oscillating signal having a frequency; and the sensing system sensing one or more parameters of the oscillator core includes the sensing system sensing the frequency of the oscillating signal. ### Claim 8 A method comprising: an oscillator core, in a first environment, generating an oscillating signal; a power management system, in a second environment, supplying power to the oscillator core to operate the oscillator core, including supplying the power from a voltage source to the oscillator core via a pass transistor by applying a current output of the pass transistor to the oscillator core; a sensing system, in the first environment, sensing one or more parameters of the oscillator core that are dependent on a temperature of the oscillator core, and generating one or more temperature dependent signals representing said temperature of the oscillator core; transmitting the one or more temperature dependent signals representing the temperature of the oscillator core from the sensing system to the second environment; and using the one or more temperature dependent signals representing the temperature of the oscillator core in the second environment to generate a reference signal, and using the generated reference signal to determine the power supplied to the oscillator core from the power management system, including applying an output of an error amplifier to a gate of the pass transistor to control the current output of the pass transistor, wherein: the oscillator core generates an oscillating signal having a variable amplitude; and the sensing system sensing one or more parameters of the oscillator core includes the sensing system sensing the amplitude of the oscillating signal. ### Claim 9 A system comprising: an oscillator core, in a first environment, for generating an oscillating signal; a power management system, in a second environment, for supplying power to the oscillator core to operate the oscillator core, including a pass transistor for supplying the power from a voltage source to the oscillator core by applying a current output of the pass transistor to the oscillator core, and an error amplifier for applying an output of the error amplifier to a gate of the pass transistor; a sensing system, in the first environment, for sensing one or more parameters of the oscillator core that are dependent on a temperature of the oscillator core, for generating one or more temperature dependent signals representing said temperature of the oscillator core, and for transmitting the one or more temperature dependent signals representing the temperature of the oscillator core from the sensing system to the second environment; and wherein the one or more temperature dependent signals representing the temperature of the oscillator core are used in the second environment to generate a reference signal, and the reference signal is used to determine the power supplied to the oscillator core from the power management system, including applying the output of the error amplifier to the gate of the pass transistor to control the current output of the pass transistor and the power supplied by the power management system to the oscillator core to operate the oscillator core, wherein the using the one or more temperature dependent signals to generate a reference signal includes: applying the one or more temperature dependent signals to a peak voltage detector in the second environment to generate a peak voltage signal in the second environment representing the temperature of the oscillator core. ### Claim 10 (depends on 9) The system according to claim 9, wherein the sensing system is electrically coupled to the oscillator core to sense the one or more parameters of the oscillator core. ### Claim 11 (depends on 9) The system according to claim 9, wherein the sensing system is magnetically coupled to the oscillator core to sense the one or more parameters of the oscillator core. ### Claim 12 (depends on 1) The system according to claim 1, wherein: the oscillator core generates an oscillating signal having a frequency; and the one or more parameters includes changes in the frequency of the oscillating signal. ### Claim 13 A system comprising: a power source, in one environment, for supplying power to an oscillator core, in another environment to operate the oscillator core, including a pass transistor for supplying the power from a voltage source to the oscillator core by applying a current output of the pass transistor to the oscillator core, and an error amplifier for applying an output of the error amplifier to a gate of the pass transistor; a monitor, in the another environment, for monitoring one or more parameters of the oscillator core that are dependent on a temperature of the oscillator core, for generating one or more temperature dependent signals representing said temperature of the oscillator core, and for transmitting the one or more temperature dependent signals representing the temperature of the oscillator core from the another environment to the one environment, and wherein the one or more temperature signals representing the temperature of the oscillator core are used in the one environment to generate a reference signal, and the reference signal is used to determine the power supplied to the oscillator core from the power source, including applying the output of the error amplifier to the gate of the pass transistor to control the current output of the pass transistor and the power supplied by the power source to the oscillator core to operate the oscillator core, wherein the using the one or more temperature dependent signals to generate a reference signal includes: applying the one or more temperature dependent signals to a peak voltage detector in the second environment to generate a peak voltage signal in the second environment representing the temperature of the oscillator core. ### Claim 14 (depends on 13) The system according to claim 13, wherein the monitor is electrically coupled to the oscillator core to monitor the one or more parameters of the oscillator core. ### Claim 15 (depends on 13) The system according to claim 13, wherein the monitor is magnetically coupled to the oscillator core to sense the one or more parameters of the oscillator core. ### Claim 16 (depends on 13) The system according to claim 13, wherein: the oscillator core generates an oscillating signal having a frequency; and the monitor monitors changes in the frequency of the oscillating signal. ### Claim 17 A method comprising: an oscillator core, in a first environment, generating an oscillating signal; a power management system, in a second environment, supplying power to the oscillator core to operate the oscillator core, including supplying the power from a voltage source to the oscillator core via a pass transistor by applying a current output of the pass transistor to the oscillator core; a sensing system, in the first environment, sensing one or more parameters of the oscillator core that are dependent on a temperature of the oscillator core, and generating one or more temperature dependent signals representing said temperature of the oscillator core; transmitting the one or more temperature dependent signals representing the temperature of the oscillator core from the sensing system to the second environment; and using the one or more temperature dependent signals representing the temperature of the oscillator core in the second environment to generate a reference signal, and using the generated reference signal to determine the power supplied to the oscillator core from the power management system, including applying an output of an error amplifier to a gate of the pass transistor to control the current output of the pass transistor, wherein the using the one or more temperature dependent signals to generate a reference signal includes: applying the one or more temperature dependent signals to a peak voltage detector in the second environment to generate a peak voltage signal in the second environment representing the temperature of the oscillator core; and the using the generated reference signal to determine the power supplied to the oscillator core from the power management system further includes: setting a specific value of the current from the power management system to the oscillator core; obtaining an amplitude of the oscillator core; setting the second environment to an initial setting to obtain a desired voltage change in an output of the oscillator core; detecting a value of the peak voltage signal; and adjusting the second environment until the value of the peak voltage signal is equal to a desired value. ### Claim 18 A method comprising: an oscillator core, in a first environment, generating an oscillating signal; a power management system, in a second environment, supplying power to the oscillator core to operate the oscillator core, including supplying the power from a voltage source to the oscillator core via a pass transistor by applying a current output of the pass transistor to the oscillator core; a sensing system, in the first environment, sensing one or more parameters of the oscillator core that are dependent on a temperature of the oscillator core, and generating one or more temperature dependent signals representing said temperature of the oscillator core; transmitting the one or more temperature dependent signals representing the temperature of the oscillator core from the sensing system to the second environment; and using the one or more temperature dependent signals representing the temperature of the oscillator core in the second environment to generate a reference signal, and using the generated reference signal to determine the power supplied to the oscillator core from the power management system, including applying an output of an error amplifier to a gate of the pass transistor to control the current output of the pass transistor, and further comprising employing current mode signaling between the first and second environments to reduce DC voltage drop and electromagnetic cross-talk due to instrumentation wiring between the first and second environments.