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Home I/O Systems BiCMOS-bit-line-load-for-a-memory-with-improved-reliability

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 BiCMOS bit line load for a memory with improved reliability

Details
Inventors: Nogle, Scott G.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Dixon; Joseph L.
Assistant Examiner: Lane; Jack A.
Attorney, Agent or Firm: Polansky; Paul J.

A BiCMOS (Bipolar Complementary Metal Oxide Semiconductor) bit line load for a memory with improved speed write recovery and improved reliability. Comprises a first bipolar transistor, a resistor, and a second and third bipolar transistors respectively coupled to first and second bit lines of a differential bit line pair. The improvement in speed is accomplished through the use of the bipolar transistors which generally switch faster than corresponding MOS transistors. The first bipolar transistor has a collector coupled to a power supply voltage terminal, a base for receiving a bias signal, and an emitter coupled to the collectors of the second and third bipolar transistors. The resistor is coupled between the collector and emitter of the first bipolar transistor. The bit line load has improved reliability by preventing self-boosting at the bases of the second and third bipolar transistors by decreasing their collector voltages enough during switching to bias them into saturation.

DETAILED DESCRIPTION Accordingly, there is provided, in one form, a bit line load coupled to a differential bit line pair in a block of the memory.
The bit line load comprises first, second, and third transistors, and a resistor.
The first transistor has a collector coupled to a power supply voltage terminal, a base for receiving a bias signal, and an emitter for providing a first reference voltage.
The resistor has a first terminal coupled to the power supply voltage terminal, and a second terminal coupled to the emitter of the first transistor.
The second transistor has a collector for receiving the first reference voltage, a base for receiving an equalization signal, and an emitter coupled to a bit line.
The third transistor has a collector for receiving the first reference voltage, a base for receiving the equalization signal, and an emitter coupled to a complementary bit line.
These and other objects, features and advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.



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