Freescale Semiconductor,inc.

Nxp Usa, Inc.

Ravi Dixit

Parul K Sharma

Sanjay Kumar Wadhwa

Anil Kumar Gottapu

Nidhi Chaudhry

An integrated circuit includes a base current cancellation circuit and a complementary to absolute temperature (CTAT) circuit. The base current cancellation circuit includes a first bipolar junction transistor (BJT) and a current mirror coupled to the first BJT. The current mirror is configured to provide a mirrored current to a base electrode of the first BJT. The CTAT circuit is coupled to receive a voltage signal corresponding to a reference current of the current mirror. The CTAT circuit includes a second BJT coupled to form a base current based on the voltage signal.

Base current cancellation circuit and method therefor

An integrated circuit includes an output driver circuit configured to provide a first voltage at an output terminal. The output driver circuit includes a transistor having a first current electrode coupled at a voltage supply terminal and a second current electrode coupled at the output terminal, and a resistor having a first terminal coupled at the output terminal and a second terminal coupled at a first node. An amplifier circuit is coupled to the output driver circuit and is configured to generate a proportional to absolute temperature (PTAT) current in a first circuit branch of the output driver circuit coupled at the first node. A complementary to absolute temperature (CTAT) circuit is configured to generate a CTAT current in a second circuit branch coupled at the first node.

Reference voltage generator with regulator system

A voltage regulator includes an error amplifier, a voltage buffer, a transistor, a frequency compensation circuit, a capacitor, and a resistive network. The error amplifier receives a reference signal and a feedback signal, and generates an intermediate control signal. The voltage buffer receives the intermediate control signal and generates a control signal. The transistor has a gate that receives the control signal, a first terminal that receives a supply voltage signal, and a second terminal that generates a regulated output signal. The frequency compensation circuit is connected to the second terminal of the transistor. The capacitor is connected to the error amplifier and the frequency compensation circuit. The resistive network receives the regulated output signal and generates the feedback signal.

Linear voltage regulator

A Universal Serial Bus (USB) controller includes a USB transceiver to detect a high-speed (HS) disconnect between the USB controller and a device connected to it. The USB transceiver includes a reference-voltage generation circuit, a HS current driver, first and second comparators, and a multiplexer. The reference-voltage generation circuit generates HS disconnect and transmitter reference-voltage signals that have a constant voltage difference. The first comparator receives DP and DM signals that correspond to a HS Start of Frame (SOF) packet during HS disconnect detection, and generates a control voltage. The multiplexer outputs at least one of the DP and DM signals based on the logic state of the control voltage. The second comparator receives the selected signal and the HS disconnect reference-voltage signal, and outputs a HS disconnect output voltage signal when the selected signal is greater than the HS disconnect reference-voltage signal.

USB transceiver

A circuit for scaling down first and second input voltages includes first and second voltage scale-down circuits that scale down the first and second input voltages, respectively. The first voltage scale-down circuit includes a transistor that receives the first input voltage at its gate and, operating in a source-follower configuration, scales down the first input voltage to generate a first output voltage at its source. The second voltage scale-down circuit is identical to the first voltage scale-down circuit and generates a second output voltage based on the second input voltage.

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Noida, India

Ravi Dixit