摘要:
A unique programming circuit, suitable for use with programmable read-only memories (PROM), or other circuits utilizing programmable fuses, is provided which overcomes several distinct disadvantages of prior art programming circuits. The programming circuit of this invention includes a Darlington pair of programming transistors which allows only a single programming transistor to be made large in order to carry the large programming current, and only a single high current drive signal need be applied to the single programming transistor, thereby minimizing power consumption and integrated circuit die area.
摘要:
A device is described, including a first diffusion region having a first terminal, a second diffusion region having a second terminal, and a channel region disposed between the first diffusion region and the second diffusion region. Further, the first terminal and the second terminal are offset to enable a non-Manhattan current flow. A system is also described, including the previously described device and a second transistor. The pathway for the flow of the majority of the current carriers in the device defines a first direction. The second transistor also has at least two terminals, and a pathway for a majority of current carriers between the two terminals defines a second direction. The angle between the first direction and the second direction is nonzero and acute.
摘要:
A method and apparatus for generating a reference signal involves (i) generating a CTAT voltage and a PTAT voltage, (ii) generating a first digital signal and a second digital signal having an amplified difference dependent on a difference between the CTAT voltage and the PTAT voltage, and (iii) dependent on the first digital signal and the second digital signal, adding or subtracting charge from the reference signal, where the reference signals controls the conductivity of devices that drive current through the devices that are used to generate the CTAT and PTAT voltages.
摘要:
A bi-directional communication system and transceiver configuration are described, which employ a bi-directional reference to account for both common-mode and differential noise introduced at either end of a bi-directional communication channel. Some implementations exploit the techniques described in a bi-directional chip-to-chip communication scheme. In some implementations, the advantages of bi-directional reference techniques described herein are obtained while pre-distortion of transmitted signals is employed to compensate for intersymbol interference (ISI) in a communications channel.
摘要:
A low-pass filter to filter the internal bias voltages. It is connected locally at the bias voltage input of each bias current source the low-pass filter reduces the AC overshoot oscillations of a local bias voltage generated by the bias voltage generator upon a changing in the amount of current sourced by other current sources. A single bias voltage generator is connected to a bias voltage input of a number of bias current sources. Each current source has a low pass filter to filter the bias voltage.
摘要:
A clock buffer circuit utilizing an LC circuit for jitter reduction. The circuit includes a differential amplifier that is coupled to a buffer stage. The output of the buffer circuit comprises the buffer stage output. An inductor and capacitor are coupled between the buffer stage output and ground. The values of the inductor and capacitor are specified such that the resonant frequency of the LC circuit corresponds to the nominal clock frequency. The entire buffer circuit including the capacitor and inductor may be fabricated on an integrated circuit. Alternatively the capacitor and/or inductor may comprise discrete components that are coupled to the buffer stage output. Additionally, multiple capacitors and/or inductors may be fabricated on the integrated circuit to permit the resonant frequency of the LC circuit to be adjusted to match the nominal clock frequency. The capacitor(s) and/or inductor(s) on the integrated circuit may be connected to integrated circuit contacts and coupled to the buffer stage output via external connections or alternatively, via semiconductor switches.
摘要:
In an input receiver circuit includes a signal input for receiving a signal input to a chip, a chip output for supplying a buffered signal to circuitry on the chip and a positive feedback circuit coupled between the chip output and the signal input. The positive feedback circuit might comprise a first inverter having an input coupled to the signal input, a second inverter having an input coupled to an output of the first inverter, wherein an output of the second inverter provides the chip output, and an inverting buffer having an input coupled to the output of the second inverter and an output coupled to the signal input.
摘要:
An apparatus for suppressing the effect of noise from a first circuit on the performance of a second circuit wherein the first and second circuits are on a common substrate. Each of the first and second circuits include first and second supply rails. The apparatus includes a noise isolation circuit and a noise transference circuit. The noise isolation circuit is for coupling the first supply rails of the first and second circuits to prevent noise on the first supply rail of the first circuit from transferring to the first supply rail of the second circuit. The noise transference circuit is for coupling the second supply rails of the first and second circuits so that noise on the second supply rail of the first circuit is transferred to the second supply rail of the second circuit.
摘要:
A clock recovery system that allows recovery of a clock signal from a high speed, potentially small amplitude data stream. The invention uses a normally avoided property of a non-linear oscillator in the clock recovery system in order to lock the oscillator in phase to an incoming signal. This property relates a characteristic of an oscillator that an oscillator amplifies noise near its inherent frequency; and if the noise is large enough, the oscillator squelches the inherent oscillator frequency signal and outputs a signal locked in frequency and phase to the noise. The clock recovery system comprises a processing circuit, an oscillator, and a control circuit. The processing circuit processes an input data stream to generate a current signal as a first control signal based on data transitions in the input data stream. The first control signal is a "noise signal" to the oscillator. The control circuit outputs a voltage control signal as a second signal to the oscillator based on a difference between an output fed back from the oscillator and a reference frequency signal matching the frequency of the input data stream within a predetermined tolerance range. The second control signal controls the oscillator so that the frequency of the oscillator output is substantially equal to that of the input data stream. Therefore, according to the invention, the oscillator is controlled by the first control signal such that the oscillator output is phase-locked and thus also frequency-locked to the input data stream.
摘要:
The present invention provides an ECL to CMOS level translation circuit which uses a dynamic, internally generated reference voltage to translate ECL level signals into CMOS level signals. The translator includes an input translation circuit which uses emitter-follower bipolar transistors for receiving and interpreting the ECL level signals and to generate the dynamic, internally generated reference potential, and an output circuit for outputting the CMOS signals.