Differential cryogenic transmitter

An integrated-circuit signal transmitter comprising:

• one or more inputs to receive a transmitter power supply that cycles periodically between power-off and power-on voltage levels to define a sequence of enable intervals during which the signal transmitter is to output voltage levels corresponding to respective transmit data bits onto an external signaling link;
• and
• output circuitry to:
• generate, at the start of each output-enable interval, an initial nonzero voltage across conductors of the external signaling link, the initial nonzero voltage having a first polarity;
• and
• during each output-enable interval and after generating the initial nonzero voltage, conditionally transition the initial nonzero voltage to a second nonzero voltage according to whether the transmit data bit corresponding to the output-enable interval has a predetermined one of two binary states, the second nonzero voltage having a polarity opposite the first polarity.

A signal transmitter comprising:

• means for receiving a transmitter power supply that cycles periodically between power-off and power-on voltage levels to define a sequence of enable intervals during which the signal transmitter is to output voltage levels corresponding to respective transmit data bits onto an external signaling link;
• and
• means for generating, at the start of each output-enable interval, an initial nonzero voltage across conductors of the external signaling link, the initial nonzero voltage having a first polarity;
• and
• means for conditionally transitioning the initial nonzero voltage to a second nonzero voltage during each output-enable interval according to whether the transmit data bit corresponding to the output-enable interval has a predetermined one of two binary states, the second nonzero voltage having a polarity opposite the first polarity.