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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Other such logic families, such as domino logicuse clocked dynamic techniques to minimize size, power consumption and delay. And so, with MOS transistors free of speed down caused by an excessive amplitude of an input signal, a BiCMOS logic gate of the embodiment can be practically combinated with other type logic gates including a logic gate needing a low power supply for avoiding deterioration caused by hot electrons without any additional power supply, providing a high applicability.
So, speed reduction caused by slow response of bipolar transistors of high mutual conductance is also eliminated in the embodiment. 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. The integrated injection logic IIL or I steeringg L uses bipolar transistors in a current-steering arrangement to implement logic functions.
Another problem of the MCML gate is that logic circuits may not function when the logic circuits are designed with a series of a large number of MCML gates because of amplitude attenuation, since very low mutual conductance gm of MOS transistors makes voltage gain of a MCML gate near 1.
Steering, the constant current source may be steeering current mirror. The BiCMOS logic circuit recited in claim 2, characterized in that said load capacitance discharging means connected to an emitter of one of said pair of emitter followers consist of a nMOS transistor, a gate of said nMOS transistor connected to one lovic said positive terminal of said power bcmos and an emitter of the other of said pair of emitter followers.
And so, with MOS transistors free of speed down caused by an excessive amplitude of an input signal, a BiCMOS logic gate of the embodiment can be practically combinated with other type logic gates including a logic gate needing a low power supply for avoiding deterioration caused by hot electrons without any additional power supply, providing a high applicability.
In this way, a flipflop logic is realized by the circuit of FIG. This paper addresses the testing of bicmos logic circuits. Archived from the original on Therefore, a minimum power supply voltage for an ECL gate non-cascaded is calculated as 2. The bicmos approach university of california, berkeley. The BiCMOS logic circuit recited in one of claims 5 through 9 or 1 or 2, connected steeeing with a circuit of a type selected from the group consisting of: In other words, no ECL gate predominant in its speed to sub-micron-processed CMOS gates is materialized by simple and low-cost processes as a bipolar process.
Therefore, when a logic signal of an amplitude of mV is input, its fluctuation is not directly reflected to the output level because it equals that a margin of mV is reserved for buffering the input fluctuation.
In order to provide a high speed, stable and low voltage swing logic gate highly applicable to a low-cost BiCMOS process, a BiCMOS logic circuit of the disclosed invention has a pair of MOS transistors, the gates of which are supplied with complementary logic input signals, and the sources of which are coupled together and are supplied with a constant current.
When the gate switches states, current is drawn from the power supply to charge the capacitance at the output of the gate. CMOS logic gates use complementary arrangements of enhancement-mode N-channel and P-channel field effect transistor.
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 logiic which the same numerals indicate the same or the corresponding parts. 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 logix standardized transistors prepared on a semiconductor substrate.
US5739703A – BiCMOS logic gate – Google Patents
ECL-compatible semiconductor device having a prediffused gate array. United States Patent Drain of the fifth nMOS transistor 19 is connected to the second resistor 4 together with drain of the third nMOS transistor 17 and further connected to gate of the sixth nMOS transistor 20 and the first output terminal 21, and similarly, drain steeriny the sixth nMOS transistor 20 is connected to the second resistor 3 together with drain of the fourth nMOS transistor 18 and further connected to gate of the fifth nMOS transistor 19 and the second output terminal In the latch circuit of FIG.
Steerign, because the logic thresholds of CMOS were proportional to the power supply voltage, CMOS devices were well-adapted to battery-operated systems with simple power supplies. Therefore, complementary logic signals of logic Pogic 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. Bicmos current steering pipeline circuit technique ieee.
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.
In computer engineering, a logic family may refer to one of two related concepts. Additionally, the constant current source may be a current mirror.
The BiCMOS logic circuit recited in one of claims 5 through 9 or 1, wherein a logic voltage swing of said complementary logic output signal is predetermined by selection of fixed values of quantities selected from the group consisting of: The technique uses the bipolar devices present in a bicmos technology as both a sensitive current detector, and a low impedance driver.
In steeering analog market the ability to integrate large mixed systems provides the compelling cost advantage of bicmos. 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 a small difference between an input dynamic range and an output dynamic range.
BiCMOS logic gate – NEC Corporation
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.
In a nMOS transistor of 0. Reduced energy implies less heat dissipation. By enlarging the gate width, the basic gate-source voltage Vgs can be diminished until the threshold voltage Vth. Bicmos a new bicmos circuit for driving large capacitive load. 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.
A whole range of newer families has emerged that use CMOS technology. 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. Cutoff frequency fr of a 0. This page was last edited on 18 Julyat High level of the logic signal input to an ECL gate is determined by the forward base-emitter bias Vf of NPN transistors 75, 76 constituting preceding emitter followers, as mV for example.
With HC and HCT logic and LS-TTL logic competing in the market it became clear that further improvements were needed to create the ideal logic device that combined high speed, with low power dissipation and compatibility with older logic families. It is extremely simple and inexpensive because it only uses passive components.