Infineon Technologies Ag

Semiconductor Components Industries, LLC

Ami Semiconductor Belgium Bvba

Alcatel Lucent

K.u. Leuven Research & Development

Michiel Steyaert

Jean-Michel Vladimir Redouté

Andreas Wiesbauer

Wim Dehaene

Jorg Daniels

Tim Piessens

A driver circuit suitable for outputting a signal onto an output line affected by conducted EMI, has a slope control circuit and an output circuit, (op-amp, Mo, Mto M). It can be used for driving a LIN network. The slope control circuit outputs a slope controlled version of the input signal to the output circuit, which (M,M) is arranged to reduce an amount of conducted EMI induced DC shift in the output circuit. This can involve clipping a feedback signal, and regulating an output stage of the op-amp to prevent the DC shift. Having a separate output circuit can help shield the slope control circuit from the EMI on the output line.

Driver circuit with EMI immunity

An apparatus is provided which has a first analog input and a second analog input. In a particular implementation, the first analog input is coupled to a first controllable oscillator and the second analog input is coupled to a second controllable oscillator. First and second digital output signals generated based on output oscillations from the first controllable oscillator and the second controllable oscillator are combined.

Analog-to-digital converter using oscillators

A DC current regulator circuit comprises a first circuit node () which is operable to receive an external input voltage. A transistor (M) has an input, a first leg and a second leg. The first leg of the transistor is isolated from the first circuit node (). An amplifier () has an output connected to the input of the transistor (M), a first amplifier input for receiving a reference voltage (V) and a second amplifier input connected to the first circuit node (). A low-pass filter () connects between the output of the amplifier and the first circuit node (). A current mirror () connects in series with the second leg of the transistor (M) and has a first branch () for providing a regulated output current and a second branch () which connects to the first circuit node (). The current regulator has reduced sensitivity to conducted EMI received at the first circuit node ().

DC current regulator insensitive to conducted EMI

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Leuven, Belgium

Michiel Steyaert