Lower voltage switching of current mode logic circuits

Apparatus comprising:

• a circuit, the circuit including:
• a first transistor and a second transistor, each having a respective control terminal and respective first and second terminals, the control terminal of the first transistor is coupled to a first input terminal, the first terminal of the first transistor is coupled to a first voltage terminal, the first terminal of the second transistor is coupled to a first output terminal;
• a first resistor having a first resistor terminal directly connected to the first input terminal and having a second resistor terminal directly connected to the first output terminal;
• a first capacitor having a first capacitor terminal coupled to the second terminal of the first transistor and having a second capacitor terminal coupled to the first output terminal;
• a third transistor having a respective control terminal and respective first and second terminals, the first terminal of the third transistor is coupled to the second terminal of the first transistor and the second terminals of the second and third transistors are coupled to a second voltage terminal;
• fourth and fifth transistors, each having a respective control terminal and respective first and second terminals, the control terminal of the fourth transistor is coupled to a second input terminal, the first terminal of the fourth transistor is coupled to the first voltage terminal, the first terminal of the fifth transistor is coupled to a second output terminal, and the control terminals of the second and fifth transistors are coupled together;
• a second resistor having a third resistor terminal directly connected to the second input terminal and having a fourth resistor terminal directly connected to the second output terminal;
• a second capacitor having a third capacitor terminal coupled to the second terminal of the fourth transistor and having a fourth capacitor terminal coupled to the second output terminal;
• and
• a sixth transistor having a respective control terminal and respective first and second terminals, its first terminal is coupled to the second terminal of the fourth transistor, the control terminals of the third and sixth transistors are coupled together, and the second terminals of the fifth and sixth transistors are coupled to the second voltage terminal;
• wherein the circuit is a first circuit, the apparatus further comprising a second circuit including:
• a first pair of transistors;
• a second pair of transistors cross-coupled to the first pair of transistors;
• a first input transistor coupled to the first pair of transistors, the first input transistor having a respective control terminal coupled to the first output terminal;
• a second input transistor coupled to the second pair of transistors, the second input transistor having a respective control terminal coupled to the second output terminal;
• a current source transistor coupled to the first and second input transistors;
• wherein the first pair of transistors, second pair of transistors, and first and second input transistors are bipolar junction transistors, and the current source transistor is a metal-oxide semiconductor field-effect transistor.