Texas Instruments Corporation

Sunil Rafeeque

Anand Kannan

Praful Kumar Parakh

Anand Subramanian

Abhijith Arakali

Venakatesh Guduri

A temperature dependent correction circuit includes a first supply source, a second supply source, a rectifying circuit, and a reference. The first supply source is configured to supply a first signal that varies with temperature along a first constant or continuously variable slope. The second supply source is configured to supply a second signal that varies with temperature along a second constant or continuously variable slope. The rectifying circuit is configured to receive the first and second signal, rectify the first signal to produce a first rectified signal, and add the first rectified signal to the second signal to produce a correction signal. The reference is configured to receive the correction signal.

Piecewise correction of errors over temperature without using on-chip temperature sensor/comparators

A reference circuit may include a bandgap reference stage, a filter stage, and a buffer stage. The reference stage may be configured to generate a reference voltage or current. The filter stage may be coupled to the reference stage and may be configured to receive the reference voltage or current, filter noise from the reference voltage or current, receive a buffer output voltage or current, and filter noise from the buffer output voltage or current. The buffer stage may be coupled to the filter stage and may be configured to isolate the reference stage and the filter stage from a loading effect of a load circuit and generate a reference signal based on the reference voltage or current to drive the load circuit.

Monolithic reference architecture with burst mode support

A minimal area, power efficient, high swing and monolithic ground centered headphone amplifier circuit operable on a low voltage. An input amplifier stage includes a first input terminal and a second input terminal and having a first gain. An output amplifier stage is coupled to an output of the input amplifier stage to provide an output signal and having a second gain. A feedback network coupled between the first input terminal and the output of the output amplifier stage. A level shifting unit coupled to the first input terminal and the feedback network. A charge pump coupled to the output amplifier stage to generate a negative supply voltage and to minimize a noise associated with the negative supply voltage using a loop gain of the amplifier, wherein the loop gain is a combination of the first gain, the second gain, and a gain of the feedback network.

Area and power efficient, high swing and monolitihic ground centered headphone amplifier circuit operable on a low voltage

A circuit and a method for biasing a compound cascode current mirror (CCCM) that enables high-voltage swing at the output and accurate current mirroring is presented. The CCCM has mirror transistors and cascode transistors which may be of a different technology kind. The drain-source voltage Vds of the mirror transistor on the input leg of the CCCM is held at a voltage Vov that is generated by the biasing circuit; Vov is the overdrive voltage of the input mirror transistor of the CCCM and the value of Vov is maintained by the bias circuit and a feed-back amplifier such that the mirror transistor remains on the edge of its active region, over manufacture deviations and tracks even over operational conditions such as temperature and supply variations. The feed-back amplifier drives the gates of the cascode transistors and uses its feedback node to hold the Vds at Vov.

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Bengaluru, India

Sunil Rafeeque