摘要:
The present invention relates to oscillator circuits for providing periodic signals. The oscillator circuit includes a crystal element having a high Q value and good stability. A high-gain amplifier is used with the crystal element to produce an oscillating signal. The oscillator is further configured to include an input protection circuit for reducing the effects of undesirably high input voltage levels, and a coupling capacitor to reduce leakage between the amplifier and the input protection circuit. A high output signal level is provided to a Schmidtt trigger amplifier through configuring the output to be taken from the input of the high-gain amplifier.
摘要:
A sense amplifier quickly charges a column line to a first predetermined voltage level with first, second and third transistors and then charges the column to a second predetermined voltage by using only the second and third transistors. The second and third transistors continue charging to the second predetermined voltage by virtue of having a lower threshold voltage than the first transistor. If a selected memory cell in the column is in a conducting state, the column charges to only the first predetermined voltage for detection as a logic "0". If the selected memory cell in the column is in a non-conducting state, the column continues charging to the second predetermined voltage for detection as a logic "1".
摘要:
An electronic timepiece includes a shutdown latch circuit. The latch circuit is initially set by insertion of a battery power source in the electronic timepiece. When the latch circuit is set, all other circuits in the timepiece, and particularly the display circuits, are turned off to conserve battery power during the "shelf-life" of the electronic timepiece. When the command switch is first activated, the latch circuit is reset, and all of the other electronic circuits are turned on in a predetermined initialized condition.
摘要:
The invention comprises a system of alignment key patterns, within the scribe lines of a semiconductor chip, which allow more accurate placement of wafer probes, and more accurate location of fuses for the purposes of blowing selected ones of those fuses by means of laser energy.
摘要:
An improved nonvolatile memory has an adaptive system to regulate the charging current supplied to store data on nonvolatile storage nodes in order to provide acceptability low strain on the tunnel oxide and to compensate for process variations and change in the Fowler-Nordheim tunnel oxide transport characteristics caused by electron trapping over time.
摘要:
A bandgap voltage reference source is provided which is temperature stable or temperature controlled and can be made by standard CMOS process. The reference has two substrate bipolar transistors with the emitter current density of one of the transistors being larger than the emitter current density of the other transistor. The transistors are used as emitter followers having resistors in their emitter circuits from which an error voltage is obtained. The error voltage is amplified through a differential or operational amplifier. Through the amplifier or through a resistor network, an output voltage higher or lower, respectively, than the bandgap voltage can be obtained. The output voltage can be made to have a positive, negative, or zero temperature coefficient.
摘要:
Ultrasonic remote control receiver wherein reference frequency pulses are counted during a counting cycle comprising a predetermined number of received command signals, each command signal occupying a different frequency channel. At the end of each counting cycle, the reference frequency count is compared with the count during the preceding counting cycle. A validated output from the receiver occurs only after a predetermined number of uninterrupted identical comparisons have occurred. Interference with a validated output signal by spurious received signals e.g. noise signals is minimized by providing for invalidation of an output signal only after a predetermined number of uninterrupted non-identical count comparisons. Two of the receiver outputs are used to generate a variable duty cycle pulse train, one output increasing and the other decreasing the duty cycle. A receiver is disclosed in the context of a TV broadcast receiver wherein the variable level d.c. control signal is used to control an electronic sound attenuator. The remote control receiver also includes power-on-reset and mute functions. Each of the remote control receiver outputs has a parallel connected manual switch, to some of which anti-bounce circuits are connected.
摘要:
A semiconductor device which has a resistor, a capacitor, a Schottky diode, and an ESD protection device all formed on a single semiconductor substrate. The resistor and the capacitor are coupled together in series. The Schottky diode and the ESD protection device are coupled in parallel to the series connection of the resistor and capacitor.
摘要:
A semiconductor device which has a resistor, a capacitor, and a Schottky diode all formed on a single semiconductor substrate. The capacitor comprises a dielectric region between two metal regions. The resistor comprises an N.sup.+ -type well. The Schottky diode comprises an N-type tub, a metal region in contact with the tub, and an N.sup.+ -type region formed in the N-type tub. The resistor and capacitor are coupled by a metal region which contacts one of the metal regions of the capacitor and the N.sup.+ -type well of the resistor. The resistor and Schottky diode are coupled by a metal region which contacts the N.sup.+ -type well of the resistor and the N.sup.+ -type well of the Schottky diode.
摘要:
A nonvolatile random access memory cell (10) includes a static random access memory circuit and a corresponding nonvolatile memory circuit. The volatile memory circuit operates in a conventional manner and has first and second data states. Upon receipt of a store command signal a charge storage node is driven to either a first or a second charge state, depending upon the data state in the volatile memory circuit. For one charge state the charge storage signal is gated through a transistor (64) and a capacitor (68) to a floating gate node (44). Charge is transferred to and from the floating gate node (44) through current tunneling elements (48,50) which comprise a dielectric fabricated on a monocrystalline substrate. For the recall operation a recall command signal is applied to a transistor (52) which couples a transistor (42) to the DATA node (22) of the volatile memory circuit. If a positive charge state has been stored at the charge storage node (44) the transistor (42) is rendered conductive to pull the DATA node (22) to ground to restore the data state to the volatile memory circuit. If a negative charge state has been stored at the charge storage node (44) there is no load applied to either the DATA node (20) or the DATA node (22). The cross-couple transistors, (12,14) are fabricated to have different lengths such that the node (22) is driven to a high voltage state whenever a default condition is encountered, thereby restoring the original data state to the volatile memory circuit.