摘要:
A first transistor is connected to a second transistor so that the first and second transistors may be initially biased in a non-conducting state when a first node is at a first voltage potential and a second node is at a second voltage potential. A potential altering circuit selectively alters the voltage potential at the first and second nodes, causes the first and second transistors to be in a conducting state for accelerating a voltage transistion at the first and second nodes toward final values, and maintains the first and second nodes at their final voltage potentials for implementing a desired Boolean function. The biasing circuit is connected to facilitate turning off the first and second transistors when the circuit is being reset for subsequent Boolean evaluations. More specifically, the biasing circuit inhibits current flow through the first and second transistors during a precharge operation to prevent excessive power consumption. The circuit according to the present invention may be employed in a number of logic applications such as simple OR/NOR or AND/NAND circuits, generalized parallel/serial logic networks, comparators, etc.. When employed in a chain, such as in a generalized parallel/serial logic network, NMOS circuit elements may be employed together with gate coupling circuitry to ensure high speed operation with minimum size.
摘要:
A high-performance flip-flop circuit implementation. The flip-flop circuit comprises an "implicit" one-shot to generate a delayed clock output (407). The flip-flop comprises a delay block (405) coupled to a clock input (210). The flip-flop may be a D-type flip-flop. In a positive-edge-triggered embodiment of the flip-flop, a falling edge (540) of the delayed clock output (407) follows a rising edge (544) of a clock signal after a delay period (548). The flip-flop clocks in new data at a data input (205) in response to the clock input (210) during this delay period (548). Data is held in a storage block (450). The flip-flop has extremely good transient characteristics, especially set-up and clock-to-output times. The flip-flop consumes no static power.
摘要:
A first transistor is connected to a second transistor so that the first and second transistors may be initially biased in a non-conducting state when a first node is at a first voltage potential and a second node is at a second voltage potential. A potential altering circuit selectively alters the voltage potential at the first and second nodes, causes the first and second transistors to be in a conducting state for accelerating a voltage transistion at the first and second nodes toward final values, and maintains the first and second nodes at their final voltage potentials for implementing a desired Boolean function.
摘要:
A high-performance dynamic flip-flop circuit implementation. The dynamic flip-flop circuit comprises an "implicit" one-shot to generate a delayed clock output (319). The flip-flop comprises a delay block (317) coupled to a clock input (305). The flip-flop may be a D-type flip-flop. In a positive-edge-triggered embodiment of the flip-flop, a falling edge (440) of the delayed clock output (319) follows a rising edge (444) of a clock signal after a delay period (448). The flip-flop clocks in new data at a data input (305) in response to the clock input (310) during this delay period (448). Data is held in a storage block (360). The flip-flop has extremely good transient characteristics, especially set-up and clock-to-output times. The flip-flop consumes no static power.
摘要:
A high-performance flip-flop circuit implementation. The flip-flop circuit comprises an "implicit" one-shot to generate a delayed clock output (407). The flip-flop comprises a delay block (405) coupled to a clock input (210). The flip-flop may be a D-type flip-flop. In a positive-edge-triggered embodiment of the flip-flop, a falling edge (540) of the delayed clock output (407) follows a rising edge (544) of a clock signal after a delay period (548). The flip-flop clocks in new data at a data input (205) in response to the clock input (210) during this delay period (548). Data is held in a storage block (450). The flip-flop has extremely good transient characteristics, especially setup and clock-to-output times. The flip-flop consumes no static power.
摘要:
A carry indicating circuit selectively generates a carry-in signal indicating whether the addition of a first plurality of bits results in a carry. A first carry chain circuit selectively generates a first carry-out signal indicating whether the addition of a second plurality of bits together with a carry from the addition of the first plurality of bits results in a carry, and a second carry chain circuit selectively generates a second carry-out signal indicating whether the addition of the second plurality of bits without a carry from the addition of the first plurality of bits results in a carry. Selection circuitry, coupled to the carry indicating circuit and to the first and second carry chain circuits, selects either the first carry-out signal or the second carry-out signal in response to the carry-in signal. The first and second carry chain circuits and/or the selection circuitry each includes a first transistor connected to a second transistor so that the first and second transistors may be initially biased in a nonconducting state when a first node is at a first voltage potential and a second node is at a second voltage potential, the first voltage potential being different from the second voltage potential. Altering circuitry is provided for altering the voltage potential at the first and second nodes for causing the first and second transistors to be in a conducting state and for accelerating the voltage at the first and second nodes to final voltage potentials.
摘要:
A high-performance dynamic flip-flop circuit implementation. The dynamic flip-flop circuit comprises an "implicit" one-shot to generate a delayed clock output (319). The flip-flop comprises a delay block (317) coupled to a clock input (305). The flip-flop may be a D-type flip-flop. In a positive-edge-triggered embodiment of the flip-flop, a falling edge (440) of the delayed clock output (319) follows a rising edge (444) of a clock signal after a delay period (448). The flip-flop clocks in new data at a data input (305) in response to the clock input (310) during this delay period (448). Data is held in a storage block (360). The flip-flop has extremely good transient characteristics, especially set-up and clock-to-output times. The flip-flop consumes no static power.
摘要:
The present invention discloses a differential logic circuit and sensing method providing differential sensing with greater speed and higher density than prior art techniques. One or more input signals are provided to a logic array and two output signals are produced from the logic array wherein one output signal of the logic array is a bit-line and one output signal of the logic array is a bit-bar-line as a reference signal, wherein both signals are provided as input signals to a differential sense amplifier having a binary output signal. The bit-line and the bit-bar-line are precharged to the same voltage level and a controlled input source-grounded transistor having less than fill drive strength is coupled to the bit-bar-line. A source-grounded transistor is coupled to each input signal of the logic array and is programmable to the bit-line by coupling the drain of the source-grounded transistor to the bit-line. A corresponding sourceless transistor, having a gate and a drain, but no source, is coupled to each input signal of the logic array and is programmable to the bit-bar-line by coupling the drain of the sourceless transistor to the bit-bar-line. The source-grounded transistors and the corresponding sourceless transistors are programmed identically providing substantially the same capacitance load on the bit-line and the bit-bar-line.
摘要:
An active power supply filter effectively eliminates power supply noise using a resistive element and a capacitive element coupled at a node, and a switch with a control terminal controlled by the node. The active power supply filter is suitable for high frequency operation of a voltage-controlled oscillator (VCO) in a phase-locked loop (PLL) of a high-speed microprocessor. The active power supply filter removes VCO noise that would otherwise create jitter that reduces the effective clock cycle of the microprocessor. The active power supply filter is similarly useful in applications other than VCOs, PLLs, and microprocessors in which removal of substantial amounts of noise from the power supply is useful.
摘要:
A semiconductor memory array with Built-in Self-Repair (BISR) includes redundancy circuits associated with failed row address stores to drive redundant row word lines, thereby obviating the supply and normal decoding of a substitute addresses. NOT comparator logic compares a failed row address generated and stored by BISR circuits to a row address supplied to the memory array. A TRUE comparator configured in parallel with the NOT comparator simultaneously compares defective row address signal to the supplied row address. Since NOT comparison is performed quickly in dynamic logic without setup and hold time constraints, timing impact on a normal (non-redundant) row decode path is negligible, and since TRUE comparison, though potentially slower than NOT comparison, itself identifies a redundant row address and therefore need not employ an N-bit address to selected word-line decode, redundant row addressing is rapid and does not adversely degrade performance of a self-repaired semiconductor memory array. By providing redundancy handling at the predecode circuit level, rather than at a preliminary address substitution stage, access times to a BISR memory array in accordance with the present invention are improved.