Texas Instruments Corporation

Karan Singh Jain

Harish Venkataraman

Susan A Curtis

Gary Franklin Chard

Timothy Bryan Merkin

Erick Omar Torres

A bandpass sense amplifier circuit (FIG.A) is disclosed. The circuit includes a capacitor (C) having a first terminal coupled to receive an input signal (Vin) and a second terminal. A current conveyor circuit (-) has a third terminal (X) coupled to the second terminal of the capacitor and a fourth terminal (Z) arranged to mirror a current into the third terminal. A voltage follower circuit () has an input terminal coupled to the fourth terminal of the current conveyor circuit and an output terminal.

Capacitor, first and second current conveyors mirror current into input

A method of decoding a biphase mark coded (BMC) data stream. A BMC encoded signal (BMC signal) including a preamble and data payload is received at a receiver which includes a BMC decoder state machine (state machine). The preamble is processed using the state machine including measuring a total duration spanning at least three transitions to provide a &#x2267;2 UI duration measure, a calculated 0.75 UI duration value (0.75 UI duration value) is generated from the &#x2267;2 UI duration measure, and the 0.75 UI duration value is compared to a programmed UI range. Provided the 0.75 UI duration value is within the programmed UI range data, respective bits are extracted bit-by-bit from the data payload using the 0.75 UI duration value to obtain unencoded data.

Self-learning and self-correcting decoding of BMC encoded signal

A circuit and method for providing a current limiting feature in a low dropout ('LDO') linear voltage regulator. A pass element generates an output voltage that is less than the input voltage. The pass element is normally enabled by an error amplifier that compares a feedback signal from the output of the pass element with a reference signal. However, the pass element may be enabled by a current limiting circuit that bypasses the error amplifier to limit the current generated at the output of the pass element.

LDO current limit control with sense and control transistors

Low noise capacitive sensor with integrated bandpass filter

A circuit for a level shifting of common mode voltage. The circuit includes a first amplifier, wherein the input of the first amplifier is coupled to a voltage source and another input of the first amplifier is coupled 2.5v, feedback resistor, R, and feedback capacitor, C, connected coupled to the voltage source, wherein other side of feedback resistor is coupled between two resistors, Rand Rand wherein the other side of the feedback capacitor is coupled between Rand the output of the first amplifier, Ris connected to Vfrom one side and Rand Rfrom the other, Ris connected to Rand Rfrom one side and Cand output of the first amplifier from the other side, another resistor, Ris connect to the output of the first amplifier, Cand Rfrom one side and Ryet another resistor, and input of ampfrom the other, a second amplifier, Ampis connected to the Rand Rat one input and 1.5v at the other input, and wherein the output of the second amplifier is connected to Rand Rconnects to one input of the second amplifier and the output of the second amplifier.

Method, apparatus and system for level shifting of common mode voltage from input to output for capacitive feedback transimpedance amplifier

An integrated analog data receiver for a capacitive touch screen. An analog data receiver circuit for a touch screen device is provided including a sigma delta analog to digital converter configured for direct connection to an analog output of a touch screen device, and further including an integrator circuit having an input coupled for receiving the analog output signal and outputting an integrated output voltage; a comparator coupled to the integrated output voltage and a first bias voltage and outputting a comparison voltage; a clocked sampling latch coupled to the comparison voltage and to a clock signal and outputting quantized data bits corresponding to samples of the comparison voltage; and a digital filter and decimator coupled to the clocked sampling latch and outputting serial data bits which form a digital representation corresponding to the output of the touch screen device. Additional circuits and systems are disclosed.

Growing community of inventors

Dallas, TX, United States of America

Karan Singh Jain