摘要:
A crossed field device of the reentrant electron beam and nonreentrant nonresonant transmission network type having means for substantially automatically quenching electron-traveling wave interaction initiated by electromagnetic energy signal pulses during nonoperation intervals. Such means are disposed adjacent to the drift space area of the interaction region and include a lumped capacitive-resistive network coupled to electrode means to rapidly terminate electron emission.
摘要:
A charge pump circuit includes a high-swing transconductance amplifier. A high input swing transconductance is provided in a negative feedback loop of the charge pump circuit without an abrupt change in transconductance. The high-swing transconductance amplifier includes a transconductance cell and high-swing circuitry. The transconductance cell includes a current supply transistor, which provides current for transconductance while input voltages are within the operational range for the transconductance cell. When the input voltages increase so as to be outside of the operational range, the current source transistor enters into triode region of operation, and provides reduced current. The high-swing circuitry supplies the current in this case so that abrupt change in transconductance does not occur. The high-swing circuitry widens the output compliant voltage range of the charge pump circuit and hence reduces the sensitivity requirement of the VCO, Kvco, in any PLL design, in particular design for PLLs used in tuners.
摘要:
A process for allowing two or more receivers to share the same nominal frequency or close nominal frequencies, preferably without these receivers blinding one another or disturbing one another is described. The process preferably includes subjecting a radiator to temporally spaced phases of operation or maximum radiation and temporally segregating the phase sensitivity of the oscillator/detector of the receivers with respect to the phase operation or the radiation of the receiver. The receiver during the phase of sensitivity of its oscillator/detector may not detect the electromagnetic radiation from the radiator.
摘要:
An ultra low power super-regenerative receiver is provided. The ultra low power super-regenerative receiver includes a bit synchronizer configured to use a value sampled from a signal output from a super-regenerative oscillator to estimate a pulse-level position having a maximum amplitude value in a single period of a received symbol, a frame synchronizer configured to combine a plurality of pulse-level positions determined based on the estimated pulse-level position, and detect a predetermined bit sequence using the plurality of pulse-level positions combined, the frame synchronizer being configured to perform frame synchronization, and a data detector configured to detect data using the plurality of pulse-level positions determined after the frame synchronization is completed.
摘要:
A digital super-regenerative receiver is provided having an analog RF detector and a regenerative oscillator. The output of the RF detector is used to generate a digital signal from which the oscillator bias is adjusted, in order to maintain the oscillator start-up time at a fixed level. The circuit senses if the start-up time is earlier or later than the predetermined start-up time and produces an output when the majority of the start times are ahead of the expected start time.
摘要:
A superregenerative amplifier/oscillator having a tunnel diode as the negative resistance device, operates in the linear mode in response to a quench pulse. The tunnel diode is biased at the valley point of its forward voltage characteristic curve. The quench pulse overcomes the bias and places the tunnel diode on the negative resistance slope of its characteristic curve thereby allowing buildup of oscillations in the superregenerative amplifier/oscillator. Automatic gain control is provided by sampling the superregenerative amplifier/oscillator output in response to maximum signal input, and controlling the width of the quench pulse in accordance with the amplitude of the superregenerative amplifier/oscillator output.
摘要:
A digital super-regenerative receiver has an analog RF detector and a regenerative oscillator. An output signal of the analog RF detector is used to generate a digital signal from which an oscillator bias is adjusted in order to maintain the oscillator start-up time at a fixed level. The circuit senses through the use of a multi-level threshold detector if the start-up time is earlier or later than the predetermined start-up time and produces an output signal when the majority of the start times are ahead of the expected start time.
摘要:
A superregenerative receiver includes a quenching oscillator for converting a received signal into a low frequency signal. The quenching oscillator comprises a transistor, a positive feedback circuit and an RC time constant circuit. A circuit is provided for modifying oscillation conditions including the base voltage of the transistor, a power supply voltage and the RC time constant of the RC circuit. In response to the output of the quenching oscillator whose oscillation condition or conditions have been modified, the quenching oscillator is placed into its optimum operating state in order that the receiver assumes substantially the maximum sensitivity.