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Active region logic circuit

阅读：270发布：2023-07-22

专利汇可以提供Active region logic circuit专利检索，专利查询，专利分析的服务。并且A logic gate including a transistor amplifier with back-to-back Schottky negative feedback diodes causes the input of the amplifier to form a current input summing junction. The Schottky diodes maintain the amplifier always in operating region with the output voltage swing limited by the diodes in each direction. The summing input junction provides weighted voting by use of input control signals of opposite polarity and of different weights.，下面是Active region logic circuit专利的具体信息内容。

权利要求

1. A logic circuit having ''''0'''' and ''''1'''' output logic levels comprising: high gain amplifier means including transistor means having an input and output, such output providing said output logic levels, said transistor means having a predetermined active operating region; negative feedback means including a pair of Schottky type diodes parallel connected with the anode of one diode coupled to the cathode of the other and vice versa, said diodes coupled between said output and input, said diodes having a diode drop substantially lower than the diode drop of said transistor means for maintaining said transistor means within said active operating region when said output is at either said ''''0'''' or ''''1'''' logic level, said diodes clamping said output at said ''''0'''' or ''''1'''' logic levels, said diodes causing said input to appear as a virtual ground whereby said input serves as a current summing junction; and control signal means coupled to said input including a first current source for producing a current signal of one polarity and a first magNitude and a second current source for producing a current signal of opposite polarity and a second magnitude, said current signals being algebraically summed at said input, a summed signal of one polarity providing a ''''1'''' output logic level and a summed signal of the opposite polarity providing a ''''0'''' logic level whereby the resultant output logic level is a function of the magnitudes of the input current signals.

2. A logic circuit as in claim 1 where said first and second current sources each include at least two diodes and a resistor.

3. A logic circuit as in claim 1 including a feedback resistor, Rf, coupled between said output and input and where said diodes have a forward voltage drop, VSB, said circuit having an output level of ''''1'''' or ''''0'''' when the absolute product of said summed current of one polarity or the opposite polarity and Rf is greater than VSB.

4. A logic circuit as in claim 1 where said output has a third logic state which is off and is a predetermined voltage level and where said ''''0'''' and ''''1'''' levels are relatively higher and lower than said predetermined voltage by the amount of the diode drop of said parallel connected diodes.

5. A logic circuit as in claim 4 where said amplifier means includes transistor and diode means series connected to provide that said predetermined voltage level has a magnitude of two diode drops whereby said output is transistor-transistor logic (TTL) compatible.

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Active region logic circuit

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