摘要:
A delay circuit (14) of the type having current tree (60) for selectively applying a current source (66) to either a first (62) or a second (64) circuit node in response to the state of an input signal (Vin), the circuit nodes being resistively coupled (76, 78) to a first voltage source (Vdd) and providing an output signal (V3, V4) delayed from the input signal according to a delay response, the delay circuit being characterized by: a first capacitance circuit (102, 108, 120) coupled between a second variable magnitude voltage source (Vc) and the first circuit node; and a second capacitance circuit (100, 104, 118) coupled between the second variable magnitude voltage source and the second circuit node, the capacitances of the first and second capacitance circuits varying according to the magnitude of the second variable magnitude voltage source, the first and second capacitance circuits determining the delay response for the delay circuit.
摘要:
In a source-coupled FET logic type output circuit, the drain electrodes of first and second FETs (Q1, Q2) are coupled through a level shift element (LS1) to a high-voltage power source (V DD ) and load elements (LD1, LD2), the gate electrodes of the FETs are respectively connected to first and second input terminals (IN, IN ), and the source electrodes of these transistors which are coupled together are coupled to a low-voltage power source (V SS ) by first constant-current power source (CC1). Furthermore, between the high-voltage power source (V DD ) and the low-voltage power source (V SS ) are connected, third FET (Q3) with its gate electrode coupled to the drain electrode of first FET (Q1), level shift elements (LS2, LS3), second constant- current power source (CC2), fourth FET (Q4) with its gate electrode coupled to the drain electrode of second FET (Q2), level shift element (LS4), third constant- current power source (CC3), fifth FET (Q5) with its gate electrode coupled between fourth FET (Q4) and level shift element (LS4), sixth FET (Q6) with its gate electrode coupled between third level shift element (LS3) and second constant-current power source (CC2), and fifth level shift element (LS5). An output signal with the potential corresponding to that of a complementary signal inputted to the input terminal ( IN , IN) to cause the third through sixth FETs (Q3, Q4, Q5, Q6) to perform a push-pull function is obtained at an output terminal (OUT) expending from a connection point between the fifth and sixth FETs (Q5, Q6).
摘要:
A logic circuit having a differential amplifier comprising a transistor pair of first (T₁) and second (T₂) transistors and further comprising a third transistor (T₃) connected in parallel with the second transistor (T₂), a first driving circuit (1) operatively connected to drive the first and second transistors with complementary output signals (A, A ) having a first (H₁) and second (L₁) levels, and a second driving circuit (2) operatively connected to drive the third transistor (T₃) with an output signal (B) having third (H₂) and fourth (L₂) levels, one (H₂) of which third and fourth levels is beyond one end of the range between the first and second levels and the other (L₂) of which levels is either within that range or beyond the other end of that range.
摘要:
A GaAs two level differential current switch (DCS) circuit is disclosed. Two cross-coupled, push-pull output buffer stages are coupled to the DCS logic circuit to increase the gain and to improve noise margins. The circuit is compatible with other GaAs logic circuits such as super buffer logic (SBL) or source follower logic (SFFL).
摘要:
Voltage controlled, triggered oscillator including a NAND gate (12) and a set of series connected triggerable delay circuits (14), the output of the NAND gate (12) being fed back to one of its inputs through the delay circuits (14). A trigger signal (Vf) is applied to another input of the NAND gate (12) and to triggering inputs of the delay circuits (14). When the trigger signal is asserted, each delay circuit (14a, 14b) produces an output signal of state which tracks the state of its input signal but with a predetermined delay so that the NAND gate output oscillates with a frequency determined by the delay times of the delay circuits (14) and the propagation time of the NAND gate (12). When the trigger signal is deasserted the NAND gate output is terminated and each delay circuit (14a, 14b) drives its output signal high regardless of the state of its input signal so that the oscillator may be rapidly retriggered.
摘要:
Circuit amplificateur différentiel régénateur de signaux complémentaires analogiques de faible amplitude, incluant:
- une paire différentielle de transistors à effet de champ (T,,T 2 ) dont les sources communes sont connectées à une première tension d'alimentation V ss à travers une charge (R 3 ); - une paire de charges (R 1 , R 2 ) connectées respectivement au drain de chaque transistor de la paire différentielle (T,, T 2 ) et à une seconde alimentation (v DD ); - un circuit régérateur de niveau comprenant une paire de diodes (D 1 , D 2 ) prelevant les signaux respectivement au drain de chaque transistor de la paire différentielle (T 1 , T 2 ), caractériséen ce que les signaux transportés par les diodes (D 1 , D 2 ) sont appliqués respectivement sur le transistor bas (T, o , T 20 ) d'une paire d'étages PUSH-PULL, dont le transistor haut (T 11 , TR,) reçoit directement le signal prélevé sur le drain du transistor opposé de la paire différentielle (T,, T 2 ), la source des transistors bas (T 10 , T 2o ) des étages PUSH-PULL étant portée à la masse et le drain du transistor haut (T 11 ,TR 1 ) de ces étages étant porté au second potentiel d'alimentation V DD , les sorties complémentaires amplifiées étant disponibles aux points milieux (11,21) des étages PUSH-PULL.
Application: régénération de signaux complémentaires analogiques de faible amplitude et de valeur continue moyenne va-riable pour mémoires statiques.