Bipolar is characterized by use of (non-insulated gate) transistors and most often associated with Transistor Transistor Logic (TTL) based logic levels. As CMOS technology came of age and got ...

Transistor-transistor-logic (TTL) はバイポーラトランジスタと抵抗器で構成されるデジタル回路の一種。論理ゲート段（例えばANDゲート）と増幅段のどちらの機能もトランジスタを使って実装しているので、（RTLやDTLとの対比で）このように呼ばれている。

Dual 3-input NOR gate implemented in RTL as used in the Apollo ... The first commercially produced TTL micrologic chips were Sylvania’s Universal High-Logic Level (SUHL) and the successor ...