Patents Assigned to Mixed-Signal Devices Inc.
  • Patent number: 12261596
    Abstract: Low temperature coefficient capacitors are described. In an embodiment, a capacitor includes several metal-oxide-semiconductor (MOS) transistors, where each of the several MOS transistors includes a gate, a source and a drain terminal, and where the source and drain terminals of each of the several MOS transistors are connected; several switches, where each of the switches includes two terminals; where first terminals of each of the switches from the several switches are connected together; and where a second terminal of each of the switches from the several switches is connected to a gate terminal of each of the several MOS transistors.
    Type: Grant
    Filed: September 10, 2021
    Date of Patent: March 25, 2025
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Rakesh Kumar Palani, Shouri Chatterjee, Sweta Agarwal, Srikar Bhagavatula
  • Publication number: 20250070683
    Abstract: In an embodiment of the invention, a full wave rectifier circuit includes an LC tank including an inductor and a first capacitor in parallel with a first end connected to supply voltage VDD, first and second transistors with drains connected to a second end of the LC tank, third transistor with source connected to source of the first transistor and to first current source, gate connected to gate of second transistor and to biasing signal VBN through first resistor and to input signal VINN through second capacitor, and drain connected to VDD, and fourth transistor with source connected to source of second transistor and to second current source, gate is connected to gate of first transistor and to biasing signal VBN through second resistor and to input signal VINP through third capacitor, and drain connected to VDD.
    Type: Application
    Filed: August 23, 2024
    Publication date: February 27, 2025
    Applicant: Mixed-Signal Devices Inc.
    Inventor: Srikar Bhagavatula
  • Patent number: 12231145
    Abstract: Systems and methods for digital signal synthesis with variable sample rate digital-to-analog converters (DACs) in accordance with various embodiments of the invention are described. One embodiment includes a digital frequency generator that includes a direct digital frequency synthesizer (DDFS); a digital-to-analog converter (DAC); a frequency/phase estimation circuit; a stable reference clock (REF CLK); a variable frequency sample clock; a frequency control word (FCW); where the DAC is sampled by the variable frequency sample clock; where the DDFS is clocked by the variable frequency sample clock; where the frequency/phase estimation circuit receives as inputs the stable REF CLK and the variable frequency sample clock and estimates a FCW frequency error and adjusts the FCW to the DDFS; where the DDFS receives the FCW and outputs a digital sine codeword at the variable frequency sample clock to the DAC, where the FCW to the DDFS is continuously adjusted to track the variable frequency sample clock.
    Type: Grant
    Filed: February 24, 2023
    Date of Patent: February 18, 2025
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 12206425
    Abstract: Systems and methods for processing and storing digital information are described. One embodiment includes a method for linearizing digital-to-analog conversion including: receiving an input digital signal; segmenting the input digital signal into several segments, each segment being thermometer-coded; generating a redundant representation of each of the several segments, defining several redundant segments; performing a redundancy mapping for the several segments, defining redundantly mapped segments; assigning a probabilistic assignment for redundantly mapped segments; converting each redundantly mapped segment into an analog signal by a sub-digital-to-analog converter (DAC); and combining the analog signals to define an output analog signal.
    Type: Grant
    Filed: August 24, 2023
    Date of Patent: January 21, 2025
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 12123968
    Abstract: Systems and methods for digitally synthesizing chirp signal in a low intermediate frequency (IF) band and using frequency multipliers to generate a higher frequency signal for radar applications are described. An embodiment includes a chirp signal generator that includes: a direct digital frequency synthesizer (DDFS) that is configured to receive an input sync signal and a frequency reference signal and generate several chirp signals at a first frequency that is in a low intermediate frequency (IF) band, several frequency multipliers that are configured to increase the chirp signals to higher frequencies and several bandpass filter circuits that are configured to remove nonlinearities from the chirp signals to generate a clean output signal.
    Type: Grant
    Filed: February 4, 2022
    Date of Patent: October 22, 2024
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 12085972
    Abstract: Systems and methods for sampled band-gap reference voltage generators are described. An embodiment includes a band-gap reference voltage generator circuit that includes: a first load transistor, a second load transistor where the gates of the first and second load transistors are connected, a first bipolar transistor, a second bipolar transistor, where the bases of the first and second bipolar transistors are connected, a first capacitor where a first terminal of the first capacitor is connected to the emitter of the first bipolar transistor through a first switch and a second terminal of the first capacitor is connected to the emitter of the second bipolar transistor through a second switch.
    Type: Grant
    Filed: March 31, 2022
    Date of Patent: September 10, 2024
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Rakesh Kumar Palani, Srikar Bhagavatula
  • Patent number: 11933919
    Abstract: Systems and methods for synthesis of a modulated RF signal using a variety of modulation schemes are described. An embodiment includes a direct frequency synthesizer with frequency modulated continuous wave (FMCW) modulation that includes: a high speed BAW resonator that generates a frequency signal; a BAW oscillator that receives the frequency signal and generates an output BAW clock signal (BAW CLK); a frequency and phase estimation circuit that receives a reference clock signal from a reference clock (REF CLK) and the BAW CLK and generates a frequency error and a phase error; a frequency chirp generator that receives chirp parameters, a chirp sync signal and generates a nominal frequency control word (FCW); and a high speed digital to analog converter (HS DAC) that receives the BAW CLK and the codeword and outputs an analog signal.
    Type: Grant
    Filed: February 24, 2022
    Date of Patent: March 19, 2024
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Publication number: 20240063803
    Abstract: Systems and methods for processing and storing digital information are described. One embodiment includes a method for linearizing digital-to-analog conversion including: receiving an input digital signal; segmenting the input digital signal into several segments, each segment being thermometer-coded; generating a redundant representation of each of the several segments, defining several redundant segments; performing a redundancy mapping for the several segments, defining redundantly mapped segments; assigning a probabilistic assignment for redundantly mapped segments; converting each redundantly mapped segment into an analog signal by a sub-digital-to-analog converter (DAC); and combining the analog signals to define an output analog signal.
    Type: Application
    Filed: August 24, 2023
    Publication date: February 22, 2024
    Applicant: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 11777511
    Abstract: Systems and methods for processing and storing digital information are described. One embodiment includes a method for linearizing digital-to-analog conversion including: receiving an input digital signal; segmenting the input digital signal into several segments, each segment being thermometer-coded; generating a redundant representation of each of the several segments, defining several redundant segments; performing a redundancy mapping for the several segments, defining redundantly mapped segments; assigning a probabilistic assignment for redundantly mapped segments; converting each redundantly mapped segment into an analog signal by a sub-digital-to-analog converter (DAC); and combining the analog signals to define an output analog signal.
    Type: Grant
    Filed: September 14, 2021
    Date of Patent: October 3, 2023
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Publication number: 20230266448
    Abstract: Systems and methods for synthesis of a modulated RF signal using a variety of modulation schemes are described. An embodiment includes a direct frequency synthesizer with frequency modulated continuous wave (FMCW) modulation that includes: a high speed BAW resonator that generates a frequency signal; a BAW oscillator that receives the frequency signal and generates an output BAW clock signal (BAW CLK); a frequency and phase estimation circuit that receives a reference clock signal from a reference clock (REF CLK) and the BAW CLK and generates a frequency error and a phase error; a frequency chirp generator that receives chirp parameters, a chirp sync signal and generates a nominal frequency control word (FCW); and a high speed digital to analog converter (HS DAC) that receives the BAW CLK and the codeword and outputs an analog signal.
    Type: Application
    Filed: February 24, 2022
    Publication date: August 24, 2023
    Applicant: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 11469761
    Abstract: Systems and methods for frequency reference generation are described. In an embodiment, a frequency reference circuit, includes: a bandgap proportional to temperature (PTAT) generator circuit that generates a bandgap PTAT current; a resistor complementary to temperature (CTAT) generator circuit that generates a resistor CTAT current; an adder that adds the PTAT current and the CTAT current to generate a constant current Icons; a switched-resistor (switched-R) circuit that receives the constant current Icons and a previously generated output clock and generates an output; a bandgap voltage reference generator circuit that generates a bandgap voltage VBG; an integrator circuit that receives the output of the switched-R circuit and the bandgap voltage VBG and generates an output; and a voltage-controlled oscillator (VCO) circuit that receives the output of the integrator circuit and generates a frequency reference.
    Type: Grant
    Filed: September 10, 2021
    Date of Patent: October 11, 2022
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Rakesh Kumar Palani, Shouri Chatterjee, Sweta Agarwal, Srikar Bhagavatula
  • Publication number: 20220252694
    Abstract: Systems and methods for digitally synthesizing chirp signal in a low intermediate frequency (IF) band and using frequency multipliers to generate a higher frequency signal for radar applications are described. An embodiment includes a chirp signal generator that includes: a direct digital frequency synthesizer (DDFS) that is configured to receive an input sync signal and a frequency reference signal and generate several chirp signals at a first frequency that is in a low intermediate frequency (IF) band, several frequency multipliers that are configured to increase the chirp signals to higher frequencies and several bandpass filter circuits that are configured to remove nonlinearities from the chirp signals to generate a clean output signal.
    Type: Application
    Filed: February 4, 2022
    Publication date: August 11, 2022
    Applicant: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 11405045
    Abstract: The present embodiments introduce an approach for designing perfectly linear DACs using non-ideal components. The approach may eliminate the non-linearity of the DAC and remove the conventional trade-offs between performance and complexity.
    Type: Grant
    Filed: September 10, 2021
    Date of Patent: August 2, 2022
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 11374583
    Abstract: Injection locked resonator-based oscillators in accordance with various embodiments of the invention are described. An embodiment includes an injection locked resonator-based oscillator, that includes: an amplifier, a feedback circuit, a delayed locked loop (DLL), an off-chip high-frequency resonator that generates a resonance frequency, a switch connected to a power source Vdd, and a voltage-controlled oscillator (VCO), where an input to the amplifier is connected to both the high-frequency resonator and the DLL to lock a signal, where an output from the amplifier is connected to the feedback circuit that is provided back to the high-frequency resonator.
    Type: Grant
    Filed: August 16, 2021
    Date of Patent: June 28, 2022
    Assignee: Mixed-Signal Devices Inc.
    Inventor: Srikar Bhagavatula
  • Publication number: 20220085823
    Abstract: The present embodiments introduce an approach for designing perfectly linear DACs using non-ideal components. The approach may eliminate the non-linearity of the DAC and remove the conventional trade-offs between performance and complexity.
    Type: Application
    Filed: September 10, 2021
    Publication date: March 17, 2022
    Applicant: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 11258448
    Abstract: Systems and methods for digital synthesis of an output signal using a frequency generated from a resonator and computing amplitude values that take into account temperature variations and resonant frequency variations resulting from manufacturing variability are described. A direct frequency synthesizer architecture is leveraged on a high Q resonator, such as a film bulk acoustic resonator (FBAR), a spectral multiband resonator (SMR), and a contour mode resonator (CMR) and is used to generate pristine signals.
    Type: Grant
    Filed: October 19, 2020
    Date of Patent: February 22, 2022
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Publication number: 20220006465
    Abstract: Systems and methods for processing and storing digital information are described. One embodiment includes a method for linearizing digital-to-analog conversion including: receiving an input digital signal; segmenting the input digital signal into several segments, each segment being thermometer-coded; generating a redundant representation of each of the several segments, defining several redundant segments; performing a redundancy mapping for the several segments, defining redundantly mapped segments; assigning a probabilistic assignment for redundantly mapped segments; converting each redundantly mapped segment into an analog signal by a sub-digital-to-analog converter (DAC); and combining the analog signals to define an output analog signal.
    Type: Application
    Filed: September 14, 2021
    Publication date: January 6, 2022
    Applicant: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Publication number: 20210175889
    Abstract: Systems and methods for digital synthesis of an output signal using a frequency generated from a resonator and computing amplitude values that take into account temperature variations and resonant frequency variations resulting from manufacturing variability are described. A direct frequency synthesizer architecture is leveraged on a high Q resonator, such as a film bulk acoustic resonator (FBAR), a spectral multiband resonator (SMR), and a contour mode resonator (CMR) and is used to generate pristine signals.
    Type: Application
    Filed: October 19, 2020
    Publication date: June 10, 2021
    Applicant: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 10840939
    Abstract: A parallel delta sigma modulator architecture is disclosed. The parallel delta sigma modulator architecture includes a signal demultiplexer configured to receive an input signal and to demultiplex the input signal to output a plurality of streams, a plurality of delta sigma modulators executing in parallel, each delta sigma modulator configured to receive a stream from the plurality of streams and to generate a delta sigma modulated output, and a signal multiplexer configured to receive a plurality of delta sigma modulated outputs from the plurality of delta sigma modulators and to multiplex together the plurality of delta sigma modulated outputs into a pulse train.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: November 17, 2020
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti
  • Patent number: 10812087
    Abstract: Systems and methods for digital synthesis of an output signal using a frequency generated from a resonator and computing amplitude values that take into account temperature variations and resonant frequency variations resulting from manufacturing variability are described. A direct frequency synthesizer architecture is leveraged on a high Q resonator, such as a film bulk acoustic resonator (FBAR), a spectral multiband resonator (SMR), and a contour mode resonator (CMR) and is used to generate pristine signals.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: October 20, 2020
    Assignee: Mixed-Signal Devices Inc.
    Inventors: Tommy Yu, Avanindra Madisetti