It can be thought of as a back-to-back diode arrangement.
The input stage transistor Q1 performs a current steering function. The basic TTL inverter consists of three stages: a current steering input, a phase splitting stage, and an output driver stage. This circuit overcomes the limitations of the single transistor inverter circuit. The schematic of a TTL inverter is shown in Figure 1. In this laboratory activity, the transistor-transistor logic (TTL) circuit inverter (not gate) and 2-input NAND gate configurations are examined. ADALM2000 Activity: TTL Inverter and NAND GateĪ variety of digital logic circuit techniques have been in use since the 1960s when integrated logic gates were first produced.
