摘要:
An improved FET capacitance driver logic circuit has an inverter feedback stage (22) connected from the output to the input of an output FET (23) to allow the output FET to have a large capacitance charging current surge followed by a reduced conduction thereafter.
摘要:
The invention relates to an amplifier arrangement comprising a first (T1) and a second (T2) field-effect transistor of the same conductivity type and a driver circuit (Q1, Q2, Q3, T3, T4, T5, I) which is responsive to drive the respective drain electrodes of the two field-effect transistors (T1, T2) to a signal to be amplified and applied to the input terminals (3, 4) drive the respective drain electrodes of the two field-effect transistors (T1, T2). An element (R) having a resistive action is formed between the drain and the gate electrode of the first field-effect transistor (T1) and an element (C) having a capacitive action is formed between the gate and the source electrode. Together with said elements (R, C) the first field-effect transistor (T1) constitutes a reactance circuit having an inductive character, which is arranged in parallel with the parasitic gate-source capacitance of the second field-effect transistor (T2). This results in the step-function response and edge steepness of step-function signals on the output terminal (5) at the drain electrode of the second field-effect transistor (T2) being improved in comparison with an amplifier arrangement without said reactance circuit. The circuit is very suitable for integration in BICMOS technology.
摘要:
An input buffer circuit for converting a logic level of an input logic signal comprises an inversion circuit (52, 82) and a level shift circuit (23) in which the inversion circuit comprises an input terminal (61) to which the input signal is applied, a first voltage source for supplying a first predetermined voltage, a second voltage source for supplying a second predetermined voltage having a level lower than that of the first predetermined voltage, a first resistor circuit (71) having a first end connected to the first voltage source, a first enhancement type field effect transistor (59) having a drain connected to a second end of the first resistor circuit, a source connected to the second voltage source and a gate connected to the input terminal, a second resistor circuit having a first end connected to the first voltage source, and a second enhancement type field effect transistor (60) having a drain connected to a second end of the second resistor circuit, a source connected to the drain of the first enhancement type field effect transistor and a gate connected to the the gate of the first enhancement type field effect transistor.
摘要:
A gallium arsenide NAND gate (100) is connected between a power source (V DD ) and a ground potential. The gate (100) is comprised of a load transistor (20) of a normally-on type field effect transistor having an output terminal (C) and a drain connected to the power source (V DD ), a first driver transistor (22) of a normally-off type field effect transistor having a gate electrode as a first input terminal (IN,) and a source-to-drain current path series-connected to that of the load transistor (20), and a second driver transistor (24) of two normally-off type field effect transistors (24A, 248) having a common gate electrode for a second input terminal (IN 2 ) and source-to-drain current paths series-connected between the power source (V po ) and the ground potential through the series-connected first driver transistor (22) and load transitor (20). The normally-off type field effect transistors (24A, 24B) are parallel-connected to each other so as to equally constitute a single driver transistor as the second driver transistor (24).
摘要:
An output buffer circuit has a data input terminal (IN) which receives logic data, load and drive transistors (20,22), a driver (24) for selectively turning on the transistors (20, 22) in accordance with the logic value of the logic data, a data output terminal (OUT) which is connected to a power source terminal (VD) of the VDD level through a current path of the load transistor (20) and is grounded through a current path of the drive transistor (22), and a capacitor (26) connected as a load to the data output terminal (OUT). The output buffer circuit further has a transition detector circuit (46) for generating a pulse signal in responseto a change in level of each of address signals (A1 - AN), and a preset circuit (48) for supplying, in response to the pulse signal, a charge or discharge current to the capacitor (26) while a voltage at the data output terminal (OUT) is not at the VDD/2 level.
摘要:
An input buffer circuit having a source follower circuit composed of a first FET (Q 1 ) whose gate electrode has an input (V in ) connected thereto, and a second FET (Q 2 ) of the same conductivity type as that of the first FET, whose drain electrode is connected to a source electrode of the first FET (Qi) directly or through at least one level-shifting diode (D i ) and whose gate electrode is supplied with a control voltage (V cont ); and a FET inverter circuit (Q 3 , 0 4 ) which is connected to the drain electrode of the second FET directly or through at least one level-shifting diode (D 2 ); an output signal being derived from the FET inverter circuit (Q 3 , Q 4 ).
摘要:
An input buffer circuit having a source follower circuit composed of a first FET (Q 1 ) whose gate electrode has an input (V in ) connected thereto, and a second FET (Q 2 ) of the same conductivity type as that of the first FET, whose drain electrode is connected to a source electrode of the first FET (Qi) directly or through at least one level-shifting diode (D i ) and whose gate electrode is supplied with a control voltage (V cont ); and a FET inverter circuit (Q 3 , 0 4 ) which is connected to the drain electrode of the second FET directly or through at least one level-shifting diode (D 2 ); an output signal being derived from the FET inverter circuit (Q 3 , Q 4 ).