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.
|Country:||Trinidad & Tobago|
|Published (Last):||15 September 2005|
|PDF File Size:||12.63 Mb|
|ePub File Size:||17.93 Mb|
|Price:||Free* [*Free Regsitration Required]|
BiCMOS logic gate – NEC Corporation
Static Dynamic Domino logic Four-phase logic. Since collector current of the first NPN transistor 69 equals the collector current I of the third NPN transistor 73, the potential drop V generated by the first resistor 71 is expressed as. A brief glossary of logic families the guiness book of records point of view.
Therefore, it has a defect that switching speed becomes remarkably slow with a heavy output load, but there is a merit on the other 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. And in addition, product of the constant current source multiplied by the resistance of the first or the second resistor 3 or 4 in FIG. BiCMOS current switching circuit having a plurality of resistors of a specified value.
The series of transistortransistor logic ttl integrated circuits are the most popular family of ttl integrated circuit logic. 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 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.
Since the transistors of a standard TTL gate are saturated switches, minority carrier storage time in each junction limits the switching speed of the device.
In order to achieve the object, a BiCMOS logic gate of an embodiment of the present invention comprises:. BiCMOS current switching circuit having a plurality of resistors of a specified value. The BiCMOS logic circuit recited in one of claim 8 and claim 9, wherein each of said respective load capacitance discharging means connected to said emitter bidmos said NPN transistor of one of said pair of emitter followers comprises: Quickly replacing diodetransistor logic, it was used to build the mini and mainframe computers of the s and s.
These devices usually ran off a 15 volt power supply and were found in industrial control, where the high differential was intended to minimize the effect of noise.
US5739703A – BiCMOS logic gate – Google Patents
In an ordinary NPN transistor with an emitter size of 0. The constant current source used may include a bipolar transistor controlled by a reference bicjos. Bicmos current steering pipeline circuit technique.
So, a minimum power supply voltage of 3. This paper addresses the testing of bicmos logic circuits. In the slave latch, gates of a third and a fourth nMOS transistors and are controlled by potential drops generated by the first and the second resistors 3 and 4 of the master latch, respectively, and potential drops generated by a first and a second resistor and control the emitter followers driving the first and the second output terminals 21 and 22, respectively. The master latch latches input complementary logic signals by a falling edge of the clock signal C as described in connection with FIG.
The BiCMOS logic circuit recited in claim 11, wherein each of said respective load capacitance discharging means connected to an emitter of the NPN transistor of one of said pair of emitter followers comprises: Beginning with an introduction to vlsi systems and basic concepts of mos transistors, this second edition of the book then proceeds to describe the various concepts of vlsi, such as the structure and operation of mos transistors and inverters, standard cell library design and its characterization, analog and digital cmos logic design, semiconductor memories, and bicmos technology and circuits.
By supplying a constant voltage obtained from a band gap reference circuit based on the negative power supply VEE to the constant voltage supply VCS, value of Vcs-Vf can be maintained always constant, independent of temperature change or power supply fluctuation. 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 substrate with at least one circuit of a type selected from the group consisting of: Since the initial devices used oxide-isolated metal gates, they were called CMOS complementary metal—oxide—semiconductor logic.
It is only when both the first and the third nMOS transistors 6 and 17 become ON that an output signal logic at the second output terminal 22 is turned to LOW by a potential drop generated by current flowing through the first resistor 3.
Logic family – Wikipedia
This is a certain merit for designing a transistor size for a semiconductor integrated circuit of a master slice method which realizes a desired logic by only a wiring process with standardized transistors prepared on a semiconductor substrate.
Wikipedia articles needing clarification from July Variations on the basic TTL design are intended to reduce these effects and improve speed, power consumption, or both. A CMOS gate draws no current other than leakage when in a steady 1 or 0 state.
Thus, input complementary logic signals are latched logix a falling edge of the clock signal C. When two ECL gates are cascade-connected, input signal level for the lower pair of NPN transistors should be lower by a forward base-emitter bias Vf than that for the upper pair of NPN transistors.
Additionally, the constant current source loigc be a current mirror. At next falling edge of the clock signal C, the master latch latches new status of the input complementary logic signals when they are changed, while the slave latch retaining its status independent of the master latch status inactivated by logic LOW of the clock signal C.
But here, the gate-drain overlay, capacitance C1′ is fairly small in MOS transistors. Diode logic dl is the most primitive of all the digital logic families.
Now, a minimum power supply voltage necessary for a BiCMOS logic gate of the embodiment is considered. The BiCMOS logic circuit recited in one of claims 2, 5, and 1, wherein said constant current source comprises a current mirror circuit. Interconnecting any two logic families often required special logicc such as additional pull-up resistorsor purpose-built interface circuits, since the logic families may use different voltage levels to represent 1 and 0 states, and may have other interface requirements only met within the logic family.
Therefore, when a logic signal of an amplitude of mV is input, its fluctuation is not bicms reflected to the output level because it equals that a margin of mV is reserved for buffering the input fluctuation. The PMOS and I 2 L logic families were used for relatively short periods, mostly in special purpose custom large-scale integration circuits devices and are generally considered obsolete. Therefore, complementary logic signals of logic HIGH and logic LOW, which are the same as logic latched by the master latch at the falling edge just before of the clock signal C, are output from the first and the second output terminals 21 and 22, respectively, in the case.
In the latch circuit of FIG. The foregoing, further objects, features, and advantages of this invention will become apparent from a consideration of the following description, the appended claims, and the accompanying drawings in which the same numerals indicate the same or the corresponding parts.
Therefore, GND potential defined as 0V, output potential Vout1 of the first output terminal 79 is given by a following equation 3when base-emitter bias of the fourth NPN transistor 75 is Vf, too. A “logic family” may also refer to a set of techniques used to implement logic within VLSI integrated circuits such as central processorsmemories, or other complex functions.
This is a certain merit for designing a transistor size for a semiconductor integrated circuit of a master slice method which realizes a desired logic by only a wiring process with standardized transistors prepared on a semiconductor substrate. Propagation delay is the time taken for a two-input NAND gate to produce a result after a change of state at its inputs.
CMOS gates can also tolerate much wider voltage ranges than TTL gates because the logic thresholds are approximately proportional to power supply voltage, and not the fixed levels required by bipolar circuits.
Bicmos and steering logic pdf book
Introduction year is when at least some of the devices of the family were available in volume for civilian uses. As heretofore described, BiCMOS logic gates of the embodiments can be applied in various logic gates by arranging a desired combination of differential pairs of nMOS transistors. 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.