CMOS inverter– link1 — link2 – Determination of pull up / pull down ratios – Stick diagram – lamda based rules – Super buffers – BiCMOS & steering logic. , Current steering switch and hybrid BiCMOS multiplexer with CMOS A BiCMOS logic circuit operating as a gate comprising. A current steering switch circuit responsive to a cmos signal. Pdf a new bicmos circuit for driving large capacitive load. Bicmos technology seminar ppt and pdf.
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Output current of the first current mirror is supplied as input current to the second current mirror and output current thereof is supplied to the coupled sources of the differential pair of the first and the second nMOS transistors 6 and 7 in the embodiment of FIG.
Therefore, with MOS transistors of low gate-drain voltage in addition to extremely low source-drain voltage, a BiCMOS logic gate with a low power supply voltage is provided in the embodiment, which can be cascaded with little increase of the power supply voltage. The voltage swing of the complementary logic output signal are determined by the reference voltage and resistance ratio of resistors in the circuit, so that the output voltage swing is independent of power supply fluctuation or temperature change.
The BiCMOS logic gate recited in one of claims 2, 5, and 1, wherein each of said load elements consists of a combination of reference resistors prepared in the same kind of fabrication process. In a nMOS transistor of 0.
Bicmos logic circuits wiley encyclopedia of electrical. In addition, power supply voltage can be still diminished to smaller than 1.
When the clock signal C turns to logic HIGH, the slave latch latches the new status of the master latch, revising the output complementary logic signals of the first and the second output terminals 21 and So, there is a problem that output amplitude fluctuates however accurately the constant voltage supply VCS is maintained. The BiCMOS logic circuit recited in one of claims 5 through 9 or 1 or 2, connected directly with a circuit of a type selected from the group consisting of: These values are equivalent to those of a NPN transistor materialized by a self-alignment process.
Therefore, a primary object of the present invention is to overcome these problems of the prior arts above described and to realize a logic gate of high applicability fabricated by a low-cost BiCMOS process, which can be implemented stably at high speed steerinf a low power supply voltage.
For example, early digital clocks or electronic calculators may have used one or more PMOS devices to provide most of the logic for the finished product. And also a high operating speed is realized in the embodiment, without any high cost processing as a self-alignment process or a trench element separation process, since values of incidental capacitances of MOS transistors are equivalent to those of a bipolar transistor materialized by the self-alignment process and the trench element separation process, and cutoff frequency of MOS transistor is sufficiently high.
Furthermore, with a combination of BiCMOS logic gates of the embodiments having their own constant surrent sources, a still complexed BiCMOS logic gate provided with different constant current sources can be materialized. Values are very typical and would vary slightly depending on application conditions, manufacturer, temperature, and particular type of logic circuit.
Some military bcmos pre-dated civilian use. The German physicist Walter H. Because stsering the incompatibility of the CD series of chips with the previous TTL family, a new bicmoss emerged which combined the best of the TTL family with the advantages of the CD family.
Furthermore, in a BiCMOS logic gate of an embodiment of the present invention, a dynamic range of said output complementary logic signal is arranged to be not smaller than a dynamic range of said input complementary logic signal and not larger than two times of said dynamic range of said input complementary logic signal.
Pdf a new bicmos circuit for driving large capacitive load.
The BiCMOS logic circuit recited in one of claims 5 through 9 or 1 or 2, in combination with, sharing a common power supply with, and being on a common stdering with at least one circuit of a type selected from the group consisting of: Several early transistorized computers e. Therefore, it has a defect that switching speed becomes remarkably slow with a heavy output load, but there is a merit on the logoc hand that it can be implemented with a power supply voltage lower by a forward base-emitter bias Vf than the ECL gate since output logic signals are not biased thereby.
A whole range of newer families has emerged that use CMOS technology.
Furthermore, with a combination of BiCMOS logic gates of the embodiments having their own constant surrent sources, a still complexed BiCMOS logic gate provided with different constant current sources can be materialized. And, it is apparent that a more stable and faster master-slave type flipflop can be provided by bicmoe the latch circuit of FIG. Drain current intensity of the first nMOS transistor 6 is equal to intensity steeding its constant current source when it sheering ON.
View and download logic3 psu instruction manual online. In the embodiments heretofore described, emitter followers having a resistor as their load discharging element are applied, but the load discharging elements can be substituted by nMOS transistors with their gates connected to the positive power supply GND as shown in FIG.
A logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several logiic designs, usually with compatible logic levels and power supply characteristics within a family. So, drain potential of the first nMOS transistor 6 drops from GND potential by a product of anf resistance R2 of the first resistor 3 multiplied by a current intensity Ics of the constant current source. All of these technologies were developed in the ss and.
The master and the slave latch have a same circuit configuration with the latch circuit of FIG. Cascade connection of MOS transistors can be applied widely because of their characteristics that the threshold voltages can be reduced and the operating speed does not sharply slow down with saturation, compared with bipolar transistors.
Additionally, the constant current source may be sfeering current mirror. DTL was also made by Fairchild and Westinghouse. Logic family 1 logic family in computer engineering, a logic family may refer to one of two related concepts. Positive parenting and teaching techniques to build healthy relationships with kids.
Texas Instruments soon introduced its own family of RTL. So, a minimum necessary power supply voltage is given by a following bicmis 11 assuming the necessary voltage for the constant current source as 0. But here, the gate-drain overlay, capacitance C1′ is fairly small in MOS transistors.
The extremely small steerimg of the on-chip wiring caused an increase in performance by several orders of magnitude.
MOS transistors, used for differential pairs of the BiCMOS logic gate of the embodiment, have smaller mutual conductance gm compared with bipolar transistors, resulting in oogic small difference between an input dynamic range and an output dynamic range. Now, conditions necessary for designing a large scale integrated logic circuit consisting of the BiCMOS logic gate of the embodiment are described.
Many motherboards have a voltage regulator module to provide the even lower power supply voltages required by hicmos CPUs.
Logic family – Wikipedia
Now, a minimum power supply voltage necessary for a BiCMOS logic gate of the embodiment is considered. The equation 1 shows that the collector current I has a constant value determined by the voltage difference Vcs, the forward base-emitter bias Vf of the third NPN transistor 73 and the resistance R2 of the third resistor So, drain potential of the first nMOS transistor 6 drops from GND potential by a product of a resistance R2 of the first resistor 3 multiplied by a current intensity Ics of the constant current source.
Output current ssteering the first current mirror is supplied as input current to the second current mirror and output current thereof is supplied to the coupled sources of the differential pair of the first and the second nMOS transistors 6 and 7 in the embodiment of FIG.