Texas Instruments Corporation

Joseph Alan Sankman

Mark William Morgan

Rajarshi Mukhopadhyay

Rajat Chauhan

Lei Chen

Keith Edmund Kunz

Sandeep Shylaja Krishnan

Avinash Shreepathi Bhat

Kishan Joshi

Raveesh Magod Ramakrishna

Abhiram Mumma Reddy

An amplifier includes a first stage and a second stage. The first stage includes a first output and a second output. The second stage includes an output, a first transistor and a second transistor. The first transistor includes a drain coupled to the first output of the first stage, and a source coupled to the output of the second stage. The second transistor includes a drain coupled to the second output of the first stage, and a gate coupled to the output of the second stage.

Differential amplifier compensation

In an example method of trimming a voltage reference circuit, the method includes: setting the circuit to a first temperature; trimming a first resistor (R) of a differential amplifier stage of the circuit; and trimming a first resistor (R) of a scaling amplifier stage of the circuit. The trimming equalizes current flow through the differential amplifier stage and the scaling amplifier stage. The method includes: trimming a second resistor (R) of the scaling amplifier stage to set an output voltage of the circuit to a target voltage at the first temperature; setting the circuit to a second temperature; and trimming a second resistor (R) of the differential amplifier stage, a third resistor (R) of the scaling amplifier stage, and a fourth resistor (R) of the scaling amplifier stage to set the output voltage of the circuit to the target voltage at the second temperature.

Two-temperature trimming for a voltage reference with reduced quiescent current

A system includes a battery. The system also includes a low dropout regulator (LDO) circuit with an input coupled to the battery and the LDO circuit. The system also includes a load coupled to an output of the LDO circuit. The LDO circuit includes an error amplifier and a control circuit coupled to the error amplifier. The LDO circuit also includes a first pass transistor coupled to the control circuit and configured to provide a first pass current as a function of load current according to a first continuous conduction curve. The LDO circuit also includes a second pass transistor coupled to the control circuit and configured to provide a second pass current as a function of load current according to a second continuous conduction curve.

Low dropout regulator (LDO) circuit with smooth pass transistor partitioning

Aspects of the disclosure provide for a circuit. In at least some examples, the circuit comprises a first amplifier, a voltage divider, a first resistor, and a transistor. The first amplifier comprises a first input terminal configured to receive a first voltage signal, a second input terminal coupled to a first node, and an output terminal. The voltage divider is coupled between a second node and a ground node and having the first node as an output node of the voltage divider. The first resistor is coupled at a first end to the second node. The transistor comprises a gate terminal coupled to the output terminal of the first amplifier, the transistor being coupled between an input voltage node and a second end of the first resistor.

Low dropout control for light load quiescent current reduction

A system includes an input voltage source, a linear regulator coupled to the input voltage source, and a load coupled to an output of the linear regulator. The linear regulator includes an error amplifier coupled to a control terminal of a switch; and a control circuit coupled to the error amplifier and configured to provide a reference voltage to the error amplifier. The control circuit includes a mode selection circuit with a slow loop configured to sample a load current and with a fast loop configured to detect an output voltage error signal. The mode selection circuit is configured to adjust a mode of the control circuit between a continuous power mode and a duty cycle power save mode based on the sampled load current and the output voltage error signal.

Low quiescent current linear regulator with mode selection based on load current and fast transient detection

An electronic circuit includes a first transistor, a second transistor, and a variable resistor. The first transistor has a first threshold voltage. The second transistor has a second threshold voltage that is different from the first threshold voltage. The second transistor is coupled to the first transistor. The variable resistor is coupled to the first transistor and the second transistor. The variable resistor is configured to adjust a temperature coefficient of the electronic circuit. The electronic circuit is configured to generate a reference voltage based on a difference of the first threshold voltage and the second threshold voltage.

Voltage threshold gap circuits with temperature trim

A method and device for providing isolated power transfer to a low-power load across a capacitor of a series resonance circuit are shown. The method includes comparing an output voltage received via a feedback loop with a desired output voltage. Responsive to determining that the output voltage is not equal to the desired output voltage, the method determines a sub-harmonic order of the resonant frequency of the series resonance circuit to use as a switching frequency and switches the series resonance circuit at substantially the determined subharmonic order of the resonant frequency.

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Dallas, TX, United States of America

Joseph Alan Sankman