H - Electricity – 03 – K
Patent
H - Electricity
03
K
330/20, 323/4
H03K 19/094 (2006.01) H03F 3/345 (2006.01) H03K 19/003 (2006.01) H03K 19/017 (2006.01)
Patent
CA 1323910
ABSTRACT OF THE DISCLOSURE A MOS (preferably CMOS type) analog NOR amplifier suitable for use in building a programmable array logic (PAL) or the like, or for other usuages. The analog NOR amplifier consists of a reference MOS transistor and first pull-up means at one branch and a plurality of input MOS transistors and second pull-up means at another branch with a constant current source connected to the sourct terminals of these MOS transistors, which forms a configruation similar to a differential amplifier. With the gate terminals of the plurality ofinput MOS transistors as logic input ends, the drain terminals of the same will act as the output end of a standard NOR gate and the drain terminal of the referenceMOS transistor will behave as the output end of a standard OR gate. On account of the differential amplifier structure, the MOS analog NOR amplifier will not generate current spikes when in logic transient transition and the amplifier gain can be kept low thereby acquiring a low output impedance to further improve the logic transient response. Furthermore, a constant current source is provided to be utilized in the MOS analog NOR amplifier, whereby the Miller capacitance of the amplifier will be maintained at almost zero so that a high speed but cost- effective NOR gate is achievable.
597021
Acer Laboratories Incorporated
Mcfadden Fincham
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