Microchip Technology Inc.

Atmel Germany Gmbh

Burkhard Gehring

Hans-Peter Waible

Wolfgang Roeper

Reinhard Reimann

Juergen Schnabel

Horst Haefner

Friedemann Schmidt

Hermann Hammel

Thorsten Fahlbusch

Gerald Krimmer

Juergen Eckert

Hans-Werner Groh

Michael Hecker

Wolfgang Schneider

Michael Vogt

A controller area network (CAN) transmitter includes an output stage circuit including a CANH port and a CANL port, and an input stage circuit configured to receive an input signal. The input signal is configured to indicate whether the output stage circuit is to provide dominant or recessive states. The CAN transmitter includes a cascode circuit configured to provide output signals on the output stage circuit to provide dominant or recessive states based on the input signal. The CAN transmitter includes a switch circuit configured to, based upon the input signal, switch the cascode circuit on and off.

CAN transmitter with fast CANL loop and switched output cascode

A controller area network (CAN) transmitter includes an output stage circuit, a replica circuit of the output stage circuit configured to produce a replica signal, and a control amplifier configured to control a CANL output signal of the CAN transmitter in order to maintain the replica signal at a desired level.

CAN transmitter with fast CANL control loop

A d.c. signal controlled oscillator includes a frequency-determining network having a control input and a modulation input. A phase regulating loop includes the oscillator and components that provide a control signal to the control input. A circuit apparatus for driving the oscillator includes a modulation generator that provides a modulation signal to the modulation input, and a circuit arrangement that autonomously generates a signal depending on and representing a slope of the modulation and provides this slope signal to the modulation generator, which generates the modulation signal dependent on the slope signal. A method of operating the oscillator involves switching a frequency divider successively to two different frequencies, respectively sampling and holding the two different arising control voltages, forming a difference between the two control voltages, and activating the modulation generator so that a modulation swing of the modulation signal is determined by this difference between the control voltages.

Method and apparatus for driving a direct current or voltage controlled oscillator with modulation slope feedback

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Heilbronn, Germany

Burkhard Gehring