Methods and structures to generate on/off keyed carrier signals for signal isolators

A transmitter system for a signal isolator system, comprising:

• an oscillator circuit coupled to an isolator device,
• a control switch, coupled between the oscillator circuit and a voltage supply having an input for an input signal to be transmitted by the system;
• and
• a quenching switch, coupled between two components of the oscillator, that becomes conductive during a transition from an ON state of the oscillator to an OFF state of the oscillator as determined by the input signal.

A transmitter system for a signal isolator system, comprising:

• an oscillator circuit coupled to an isolator device,
• a control switch, coupled between the oscillator circuit and a voltage supply having an input for an input signal to be transmitted by the system;
• and
• a current injection circuit, coupled to the oscillator, that becomes active during a transition from an OFF state of the oscillator to an ON state of the oscillator as determined by the input signal.

A multi-channel transmitter system for a signal isolator system, comprising:

• a plurality of channels for transmission of respective signals across an isolation barrier, each channel comprising a transmitter and an isolator device,
• the transmitters each comprising:
• an oscillator circuit coupled to an isolator device,
• a control switch, coupled between the oscillator circuit and a voltage supply having an input for an input signal to be transmitted by the system;
• and
• a means for accelerating transition of the oscillator circuit on a transition between an ON state and an OFF state as determined by the input signal.