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CMOS-differential-amplifier-sense-amplifier

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CMOS differential-amplifier sense amplifier

Details

Inventors: Hodapp, Stephen;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Miller; Stanley D.
Assistant Examiner: Phan; Trong Quang
Attorney, Agent or Firm: Fisher; John A., Van Myers; Jeffrey, Clingan, Jr.; James L.

A CMOS sense amplifier for use in a memory comprises two CMOS differential amplifiers. Each differential amplifier receives the same two signals generated from a selected bit line pair and each provides a different one of a complementary pair of signals. Each differential amplifier has a current mirror for loads. Each differential amplifier uses a transistor current source. A transistor will operate as a more ideal current source if it is in saturation. The transistor current source is biased by the current mirror of the differential amplifier of which it is a part. The resulting differential amplifier thus has a transistor current source which is biased closer to saturation than if biased by a normal clock signal which is either at the high or low power supply voltage. The self-biasing aspect avoids the problems associated with generating a special reference voltage for the differential amplifier.

DETAILED DESCRIPTION An object of the present invention is to provide an improved sense amplifier.
Another object of the invention is to provide an improved differential-amplifier sense amplifier.
Yet another object of the invention is to provide a CMOS differential amplifier with an improved current source.
These and other objects are achieved in a sense amplifier having a voltage-controlled current source, a first current mirror load, a first transistor, and a second transistor.
The first voltage-controlled current source has a control terminal, and first and second current terminals for flowing current therebetween.
The second terminal is coupled to a first power supply terminal.
The first current mirror load has a reference portion and a load portion.
The reference portion is coupled to the control terminal of the first voltage-controlled current source.
The load portion provides an output signal of the differential amplifier.
The first transistor has a first current electrode coupled to the reference portion of the first current mirror, a control electrode coupled to a first input signal, and a second current electrode coupled to the first terminal of the first voltage-controlled current source.
The second transistor has a first current electrode coupled to the load portion of the current mirror, a control electrode for receiving a second input signal, and a second current electrode coupled to the second current electrode of the first transistor.

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