13 patents
Utility
Voltage regulator and bandgap voltage reference with novel start-up circuit and seamless voltage reference switch over for PSR enhancement
6 Sep 22
A voltage regulation loop includes a voltage reference generation block that includes a bandgap voltage reference circuit; a linear voltage regulator block that includes a first and second linear voltage regulators, wherein the first linear voltage regulator provides a first regulated power supply to the bandgap voltage reference circuit in the voltage reference generation block, and the second linear voltage regulator provides a second regulated power supply to a load; and a soft startup circuit connected between the voltage reference generation block and the linear voltage regulator block, wherein a selector functions with a control block to output a selected voltage reference to pass to the soft startup circuit, wherein the soft startup circuit smooths the selected voltage reference and produces a smoothed voltage reference to pass to the linear voltage regulator block to prevent overshoots at startup.
Bishoy Milad Helmy Zaky, Anand Veeravalli Raghupathy
Filed: 19 Jun 19
Utility
High Accuracy Low Power Small Area Cmos Current Starved Ring Oscillator with Novel Compensation Techniques for Supply, Temperature and Process Dependency
4 Aug 22
An apparatus includes a poly current generator circuit, which includes a fractional bandgap circuit, or a bandgap voltage reference circuit and a current reference generator, an adaptive bias current generator, a frequency generator to generate an output clock signal having a select frequency, wherein the frequency generator includes a current starved ring oscillator that comprises n identical cascaded stages connected in a shape of a ring, wherein an output of the nth cascaded stage is fed back as an input of the first cascaded stage, wherein n is an odd number greater than or equal to 3; and clock buffers configured to buffer the output clock signal generated by the frequency generator for distribution.
Bishoy Milad HELMY ZAKY, Sameh Ahmed Assem IBRAHIM, Hazem Hassan Mohamed HAMMAM, Anand VEERAVALLI RAGHUPATHY, Moises Emanuel ROBINSON
Filed: 22 Apr 22
Utility
Current Reference Circuit with Current Mirror Devices Having Dynamic Body Biasing
16 Sep 21
A current reference circuit with one or more current mirror devices having dynamic body biasing includes a voltage-to-current converter circuit having a feedback loop that includes an operational amplifier, an NMOS device, and a resistor to generate a reference current; a current mirror circuit, including one or more current mirror devices with source degeneration, to produce one or more output currents that are copies of the reference current; and a body-biasing stage including an active N-well to dynamically set a body-biasing voltage for the one or more current mirror devices.
Mohammad Ahmed RADWAN, Anand Veeravalli RAGHUPATHY, Michael A NIX
Filed: 14 Mar 20
Utility
Dual-loop regulated switched capacitor DC-DC converter
23 Mar 21
A dual loop regulated switched-capacitor converter circuit includes a switched capacitor array that includes a plurality of switches and capacitors; a digital controller for controlling the switched capacitor array; a pulse modulator connected to the digital controller; a clock generator connected to the digital controller; a first comparator connected to the pulse modulator; and a feedback network connected to the first comparator.
Sameh Assem Ibrahim, Mohammad Ahmed Radwan, Michael A Nix
Filed: 31 Dec 19
Utility
Methods and apparatus for online timing mismatch calibration for polar and segmented power amplifiers
2 Mar 21
An apparatus and methods for timing mismatch in a power amplifier includes a segmented PA with two-path timing mismatch calibration to improve ACLR performance over different signal transitions, process, voltage and temperature (PVT) variations and device aging; a fast and efficient algorithm for measuring and calibrating the delay of two paths (signal path and control path); a signal magnitude variation detection circuit, such as flash ADC, with improved comparator's performance for RF signal processing and minimum delay.
Jose Silva-Martinez, Junning Jiang, He Hu, John Tabler
Filed: 26 Aug 19
Utility
Voltage Regulator and Bandgap Voltage Reference with Novel Start-up Circuit and Seamless Voltage Reference Switch Over for PSR Enhancement
23 Dec 20
A voltage regulation loop includes a voltage reference generation block that includes a bandgap voltage reference circuit; a linear voltage regulator block that includes a first and second linear voltage regulators, wherein the first linear voltage regulator provides a first regulated power supply to the bandgap voltage reference circuit in the voltage reference generation block, and the second linear voltage regulator provides a second regulated power supply to a load; and a soft startup circuit connected between the voltage reference generation block and the linear voltage regulator block, wherein a selector functions with a control block to output a selected voltage reference to pass to the soft startup circuit, wherein the soft startup circuit smooths the selected voltage reference and produces a smoothed voltage reference to pass to the linear voltage regulator block to prevent overshoots at startup.
Bishoy Milad HELMY ZAKY, Anand Veeravalli Raghupathy
Filed: 18 Jun 19
Utility
On-chip emulation of large resistors for integrating low frequency filters
7 Sep 20
A system for processing of signals with poles that are low in frequency includes a switched capacitor circuit that includes two switches connected to an input and an output of a switching capacitor (Cs), respectively, in an alternating manner at a selected switching frequency (fSW); and a filter capacitor connected between an input and the switched capacitor circuit.
Anand Veeravalli Raghupathy
Filed: 28 Aug 16
Utility
Scalable low output impedance bandgap reference with current drive capability and high-order temperature curvature compensation
1 Jun 20
A bandgap reference circuit includes a circuit for high-order temperature curvature compensation; and a circuit for low output impedance and current drive capability, wherein an output voltage of the bandgap reference circuit can be independently adjusted to be either above or below a silicon bandgap voltage without impacting temperature curvature.
Sameh Assem Ibrahim, Anand Veeravalli Raghupathy, Mostafa Mohamed Hesham Kamel Toubar, Moises Emanuel Robinson
Filed: 26 Jun 18
Utility
Circuit and Method for Pass Transistor Sharing In Voltage Regulators
20 May 20
A voltage regulator includes a load detection controller for detecting whether an output capacitor is present at an output of the voltage regulator; a digital controller for selecting a functional state of the voltage regulator based on a signal from the load detection controller; a first feedback loop for regulation when the output capacitor is not present; a second feedback loop for regulation when the capacitance output capacitor is present; and a first pass transistor shared by the load detection controller, the first feedback loop, and the second feedback loop, wherein the first pass transistor is configured to work with the first or second feedback loop selected for regulation based on the functional state of the voltage regulator.
Sameh Assem IBRAHIM, Faisal Abdellatif Elseddeek HUSSIEN, Mohamed Mostafa Saber ABOUDINA, Moises Emanuel ROBINSON, He HU
Filed: 20 Mar 18
Utility
Circuit and method for load detection using switched capacitors
18 May 20
A load detection circuit includes a variable current source circuit having a first input connected to a power supply, a second input, and a first output connected to an output load; a switched capacitor circuit having a third input connected to an external voltage reference signal, a fourth input connected to the first output of the variable current source, a fifth input connected to ground, a sixth input, and a second output; a comparator having a seventh input connected to the second output of the switched capacitor circuit, an eighth input connected to the first output of the variable current source, and a third output; an edge detector having a ninth input connected to the third output of the comparator, and a fourth output; and a digital controller having a fifth output connected to the variable current source and a sixth output connected to the switched capacitor circuit.
Sameh Ahmed Assem Ibrahim, Faisal Abdellatif Elseddeek Hussien, Mohamed Mostafa Saber Aboudina, Mohamed Ahmed Mohamed El-Nozahi
Filed: 13 Jul 17
Utility
Scalable Low Output Impedance Bandgap Reference with Current Drive Capability and High-order Temperature Curvature Compensation
22 Apr 20
A bandgap reference circuit includes a circuit for high-order temperature curvature compensation; and a circuit for low output impedance and current drive capability, wherein an output voltage of the bandgap reference circuit can be independently adjusted to be either above or below a silicon bandgap voltage without impacting temperature curvature.
Sameh Assem IBRAHIM, Anand VEERAVALLI RAGHUPATHY, Mostafa Mohamed Hesham Kamel TOUBAR, Moises Emanuel ROBINSON
Filed: 26 Jun 18
Utility
Method and apparatus for low-output-noise, high-power-supply-rejection and high-precision trimmable band-gap voltage reference suitable for production test
20 Apr 20
A band-gap reference circuit includes a band-gap voltage reference core to provide a reference voltage; a low impedance block; three capacitors; two transmission gates to connect and disconnect the capacitors; and two digital control blocks.
Mostafa Mohamed Hesham Kamel Toubar, Anand Veeravalli Raghupathy, Sameh Ahmed Assem Ibrahim
Filed: 29 Nov 18
Utility
Method and apparatus for band-gap based power-on-reset including fast, low power and accurate brownout detection
21 Oct 19
A power-on reset (POR) circuit with an auxiliary control circuit and an enhanced resistor ladder for brownouts circuit detectors in low power applications includes a power-up detector circuit for detecting power supply ramp-up while charging; a brownout detector circuit for sensing power supply falling down; a set-reset (SR) latch to generate a power-on-reset (POR) signal; a start-up network; and an internal band-gap voltage reference circuit, wherein the internal band-gap voltage reference circuit is configured to be started by the start-up network to serve as a reference for the power-up detector circuit.
Luis Angel Tellez Estrada, Anand Veeravalli Raghupathy
Filed: 11 Nov 18
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