Comparator circuit for generating a control signal corresponding

Details Comparator circuit for generating a control signal corresponding Comparator circuit for generating a control signal corresponding

1994-12-29

1996-04-23

Callahan, Tomothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 87, 327 80, 327436, H03K 522

Patent

active

055107354

ABSTRACT:
A comparator circuit (31) for sensing a voltage difference between a battery voltage and a power supply voltage is coupled to a switch (39). The comparator circuit is capable of accurately sensing a voltage near the power supply voltage. The comparator circuit (31) comprises a first amplification stage (32-36), a second amplification stage (37), and a Schmitt trigger (38). The first amplification stage (32-36) includes a first source follower (32) and a second source follower (33) for generating a differential voltage corresponding to a difference voltage between the battery voltage and the power supply voltage. The first amplification stage (32-36) reduces problems in amplifying voltage near the power supply voltage by level shifting the voltage through the use of source followers and insuring transistors operate in a saturation region of operation. The second amplification stage (37) further amplifies the difference voltage between the battery voltage and the power supply voltage. The Schmitt trigger (38) provides a logic signal for controlling the switch (39).

REFERENCES:
patent: 4394587 (1983-07-01), McKenzie et al.
patent: 4511810 (1985-04-01), Yukawa
patent: 4598215 (1986-01-01), Schechtman et al.
patent: 4658157 (1987-04-01), McGowan
patent: 5180930 (1993-01-01), Mayes
patent: 5289054 (1994-02-01), Lucas
patent: 5311071 (1994-05-01), Ueda
patent: 5341034 (1994-08-01), Matthews

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