摘要:
A selector circuit includes a plurality of first selection circuits each configured to select one of plural input signals on the basis of a first selection control signal and to output a first output signal and a second selection circuit configured to select one of the first output signals on the basis of a second selection control signal. Each of the first selection circuits includes a charging circuit configured to charge a first node by electrically connecting the first node to a first voltage in a first period, and a discharge control circuit configured to control, on the basis of the first selection control signal, the input signals and the second selection control signal, whether to discharge the charged first node by electrically connecting the first node to a second voltage source having a potential lower than the first voltage source in a second period following the first period.
摘要:
Logic circuits provide networks to simulate the functions of neural networks of the brain, and can discriminate degrees of state, and combinations of degrees of state, corresponding to a number of neurons. Logic circuits comprise Recursive AND NOT Conjunctions (RANCs), or AND NOT gates. A RANC is a general logic circuit that performs conjunctions for 2n possible combinations of truth values of n propositions. The RANCs function dynamically, with capabilities of excitation and inhibition. Networks of RANCs are capable of subserving a variety of brain functions, including creative and analytical thought processes. A complete n-RANC produces all conjunctions corresponding to the 2n possible combinations of truth values of n propositions.
摘要:
There is provided a semiconductor device including an output buffer circuit which reduces an area occupied by a circuit for impedance adjustment and allows high-speed impedance adjustment. In an impedance measuring circuit, the impedance values of reference transistors having the same sizes as those of a plurality of transistors composing the output buffer circuit which are equal in size are measured. An impedance code generating circuit outputs impedance codes corresponding to the impedance values of the reference transistors to an output buffer code generating circuit based on the result of the measurement from the impedance measuring circuit. The output buffer code generating circuit generates output buffer codes for adjusting the impedance of the output buffer circuit by performing an arithmetic operation process to provide an objective impedance based on the impedance codes.
摘要:
A logic block comprised of several transistors is provided. The logic block has several inputs and an output for communicating the result of its logic operation. A precharge device having a clock input is connected to the output of the logic block. The precharge device periodically allows the output of the logic block to become valid. This is accomplished by holding the output of the logic block at a fixed voltage level when the clock input is at a first voltage level, and when the clock input changes to a second voltage level, the precharge device allows the result of the logic function performed by the logic block to appear at the output of the logic block. Also, a charge redistribution prevention device is connected to at least one of the transistors included in the logic block. The charge redistribution prevention device prevents charge redistribution by applying a voltage to at least one of the transistors in the logic block. Applying a voltage in this manner equalizes the difference in voltage between internal nodes of the logic block and the output of the logic block, thereby preventing charge from redistributed.
摘要:
Method and apparatus for exploiting exclusivity of operation between a plurality of logic gates. The apparatus comprises a circuit having a plurality of logic gates. Each logic gate comprises a unique control input, and shares a data input with each of the plurality of logic gates. Control signals received at the control inputs insure exclusivity of operation between the logic gates. The shared data input is coupled to a shared fet which may serve as a virtual power supply for each of the plurality of logic gates.
摘要:
A multiplexing arrangement. The multiplexing arrangement comprises a set of data inputs wherein a first multiplexer is coupled to a first subset of the set of data inputs and a second multiplexer is coupled to a second subset of the set of data inputs. Only one of the first and second multiplexers is selected to pass one of the set of data inputs at any given time. A logic gate is coupled to the first and second data outputs, and the logic gate synthesizes an output signal for the multiplexing arrangement in response to values output by the first and second multiplexers such that the multiplexing arrangement operates as a single multiplexer. According to one embodiment, the multiplexer that is not selected to pass data has its output biased to a known state.
摘要:
A NOR decode circuit which includes a latch composed of a pair of n-channel transistors and a pair of p-channel transistors with the p-channel transistor of one latch portion coupled to a reference circuit transistor via a first pass transistor and the p-channel transistor of the other latch portion coupled to the address select line controlled transistors via a second pass transistor. The pass transistors are also controlled by an enable row (ENROW) signal. The address transistors are larger and conduct more current than the reference transistor. When ENROW is activated, the n-channel transistors of the latch are enabled and current passes through one side of the latch circuit and through a third transistor in parallel with the address transistors if any of the address transistors are turned on. Current also flows through the other side of the latch circuit and through a fourth transistor in parallel with the reference transistor. The second pass transistor conducts a current I.sub.1 plus the current through the reference transistor (I.sub.ref) and the first pass transistor conducts a current I.sub.1 plus the current through an address transistor (nI.sub.ref). Therefore, the second pass transistor conducts a current I.sub.1 +I.sub.ref and the first pass transistor conducts a current I.sub.1 +nI.sub.ref. The difference between these currents, i.e. (n-1)I.sub.ref, is amplified by the latch, causing the row line to remain low when an address transistor is selected and causing the row line to be high when none of the address transistors is selected.
摘要:
A driver circuit especially for driving scan velocity modulation (SVM) coils or similar loads is characterized by low quiescent current loading and high peak output. The driver is coupled to an input signal varying between a quiescent signal level and a peak signal level. A transistor is coupled to a power supply and to the input signal, so as to conduct according to the input signal. A nonlinear element such as a diode is coupled in series with the emitter-collector junction of the transistor, and is biased to a voltage slightly less than a forward biased conducting diode voltage drop. Thus the diode has a higher resistance when the transistor is conducting at the quiescent signal level, and a lower resistance when the transistor is conducting at the peak signal level. The quiescent bias conditions are maintained by resistors in series and parallel with the diode. The driver may be configured as a complementary push-pull stage.
摘要:
An inverter stage includes a supply voltage terminal and a reference potential terminal. An npn transistor has a base terminal for receiving an input signal, a collector terminal for supplying an output signal, and an emitter terminal. A controllable current source is connected between the emitter terminal of the transistor and the reference potential terminal. A series circuit of at least two diodes is connected between the supply voltage terminal and the collector terminal of the transistor. A symmetrical inverter stage assembly includes two of the inverter stages being connected in parallel with the emitters of the transistors of each of the inverter stages being connected to one another. A ring oscillator includes n (n.gtoreq.1) of the inverter stages connected in series. The inverter stages include first and last inverter stages, each of the inverter stages has an output and an input, and the output of the last inverter stage is connected to the input of the first inverter stage.
摘要:
A dynamic biasing circuit is disclosed that includes a blocking current source (20) having a first current path connected to a first node (NODE 1) and a second current path connected to a second node (NODE 3). A linear source follower (22) has a first current path connected to the second node (NODE 3), a second current path connected to a voltage reference (24), and an input connected to the first node (NODE 1). A parasitic capacitor (26) is connected to the first node (NODE 1) and to ground potential, and a parasitic capacitor (28) is connected to the second node (NODE 3) and to ground potential.