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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C1 and C3 represent a base-collector capacitance and a stteering capacitance respectively, with C3 being a collector capacitance to the semiconductor substrate. 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: Schottky formulated a theory predicting the Schottky effectwhich led to the Schottky diode and later Schottky transistors. 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 steerig the first and the second output terminals 21 and 22, respectively, in the case.
On the other hand, having a merit as for the power supply voltage reduction without emitter follower, the conventional CML gate is inferior in its output-driving capacity and has a problem of a remarkable slowdown with a load of fanouts or wiring capacitances.
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.
University of connecticut bicmos best of both worlds.
Since nMOS transistors, having low mutual conductance gm compared with bipolar transistors, are used as switching elements in the BiCMOS logic gate of the embodiment, complementary signals are better to be used for the logic signals. It could be used both with logic devices which used 3.
US5739703A – BiCMOS logic gate – Google Patents
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 logkc. By enlarging the gate width, the basic gate-source voltage Vgs can be diminished until the threshold voltage Vth.
In a nMOS transistor of 0. And also a high operating speed is realized in the embodiment, without any high cost processing as a self-alignment process or a bimos 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 steeting frequency of MOS transistor is sufficiently high.
Bicmos a new bicmos circuit for driving large capacitive. Logic reference guide bipolar, bicmos, and cmos logic technology commitment, reliable steerint supply innovation, lowvoltage logic portfolio comprehensive, mature logic solutions.
In connection with the drawings, embodiments of the present invention will be described in the following paragraphs.
So, the first and the second nMOS transistors 6 and 7 follows immediately to an input signal swing strering a charge or a discharge of each drain begins at once. A CMOS gate draws no current other than leakage when in a steady 1 or 0 state. Bicmos technology seminar ppt and pdf report logic reference guide bipolar, bicmos, and cmos logic technology commitment, reliable global supply innovation, lowvoltage logic portfolio comprehensive.
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. Configuration of the latch circuit of FIG. 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 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.
Several techniques and design styles are primarily used in designing large single-chip application-specific integrated circuits ASIC and CPUs, rather than generic logic families intended for use in multi-chip applications.
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. 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.
Logic family – Wikipedia
Furthermore, with a combination of BiCMOS logic gates of the embodiments having their own constant bicjos sources, a still complexed BiCMOS logic gate provided with different constant current sources can be materialized.
These values are equivalent to those of a NPN transistor materialized by a self-alignment process. Bicmos is a complement to pure cmos and bipolar technologies in important system application areas.
The problem with bicmos n for standard bicmos, the logic swing is v dd 2v bea. Other such logic families, such as domino logicuse clocked dynamic techniques to minimize size, power consumption and delay. The master latch latches input stteering logic signals by a falling edge of the clock signal C as described in connection with FIG.
Archived from the original on Each potential of both electrodes of the gate-drain overlap capacitance C1′ are shifted to opposite side, and so, C1′ is about two times as affecting as other capacitances. MOS transistors, used for differential pairs of the BiCMOS logic gate of the embodiment, have smaller mutual conductance gm compared with bipolar steerng, resulting in a small difference between an input dynamic range and an output dynamic range.
This paper addresses the testing of stedring logic circuits. So, a minimum power supply voltage of 3. Bicmos logic circuits wiley encyclopedia of electrical. Variations on the basic TTL design are intended to reduce these effects and improve speed, power consumption, or both. ECL-compatible semiconductor device having a prediffused gate array. And in addition, product of the constant current source multiplied by the resistance of the first or bixmos second resistor 3 or 4 in FIG.
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 of said NPN transistor of one of said pair of emitter followers comprises: