摘要:
The invention relates to a method for operating a pulse generator (1) for generating measuring pulses for a capacitive sensor having an adjustable pulse time in the range from 10 ns to 200 ns, having a controllable delay circuit (2) which contains a first integrating RC combination (RT1/CT1) and a second integrating RC combination (RT2/CT2), having a logical combining element (3) having two inputs and one output, an initialization circuit (5) and a control unit (4), wherein the first input of the logical combining element (3) receives a clock signal, and the second input of the logical combining element (3) receives an analog setting signal (SSE) from the output of the delay circuit (2), wherein two simultaneous clock signals are generated, of which the first clock signal (T) is led without delay to the first input of the logical combining element (3), and the second clock signal (T2), delayed by the delay circuit (2), is led to the second input of the logical combining element (3), time-variable output pulses are generated with the aid of time-variable preloading signals (VL), wherein the output from the delay circuit (2) after each measuring pulse is discharged or charged by the initialization switch (5).
摘要:
There are disclosed various methods and apparatuses for generating oscillator signals.In some embodiments the method comprises receiving a reference clock signal;obtaining a set of phase shifted reference clock signals; obtaining a phase selection control;using a most significant part of the phase selection control to select one of the phase shifted reference clock signals; and using a least significant part of the phase selection control to delay the selected phase shifted reference clock signal.
摘要:
In one embodiment, a circuit-based apparatus (200) that operates on an input data stream (205) includes delay-line circuitry (215) that characterizes the input data stream (205), modified over time. A plurality of integrators (225) provide a plurality of integrated signals in response to the delay-line circuitry (215), and a plurality of weighting amplifiers (235) amplify the plurality of integrated signals by a plurality of respective time-varying weighting factors to provide weighted signals. A signal-combining circuit (240) combines the weighted signals. The circuit-based apparatus (200) also includes a plurality of parallel signal-processing circuit paths (210) that couple the weighted signals to the signal-combining circuit (240). By combining the weighted signals from the parallel signal-processing circuit paths (210), the signal-combining circuit (240) provides a signal representative of the input data stream (205).
摘要:
In one embodiment, a circuit-based apparatus (200) that operates on an input data stream (205) includes delay-line circuitry (215) that characterizes the input data stream (205), modified over time. A plurality of integrators (225) provide a plurality of integrated signals in response to the delay-line circuitry (215), and a plurality of weighting amplifiers (235) amplify the plurality of integrated signals by a plurality of respective time-varying weighting factors to provide weighted signals. A signal-combining circuit (240) combines the weighted signals. The circuit-based apparatus (200) also includes a plurality of parallel signal-processing circuit paths (210) that couple the weighted signals to the signal-combining circuit (240). By combining the weighted signals from the parallel signal-processing circuit paths (210), the signal-combining circuit (240) provides a signal representative of the input data stream (205).
摘要:
A timer circuit provides a wide range of precise and substantially accurate time intervals. The timer circuit includes a ramp generator circuit having a first input for receiving an input signal to start a ramp signal, a second input for receiving a ramp timing control signal, and an output for providing a ramp signal. A comparator has a first input coupled to the output of the ramp generator, a second input coupled to a reference voltage source, and an output for providing an end ramp signal. A counter circuit has a first input for receiving the end ramp signal to begin counting, a second input for receiving a counter timing control signal, and an output for providing a terminal count signal. The end ramp signal and the terminal count signal are combined in an AND gate to provide a signal that is delayed by a predetermined amount from the input signal.
摘要:
A semiconductor device for driving a light emitting element used in high speed optical communication. The semiconductor device comprises circuitry for delaying a clock signal and producing first and second delay signals. The second delay signal has a delay time different from that of the first delay signal. The first delay signal controls flip-flop circuitry which receives a data signal and outputs a signal indicative of the data signal. The first delay signal also controls a first latch circuit to receive the signal from the flip-flop circuitry and output a signal with the delay time of the first delay signal. The second delay signal controls a second latch circuit to receive the signal from the flip-flop circuitry and output a signal with the delay time of the second delay signal. The signals output from the first and second latch circuits are logically combined by logic circuitry. The logic circuitry is either AND or OR circuitry. The logic circuitry outputs the result of the combination to driving circuitry which provides the current to drive the light emitting element in accordance with the output of the logic circuitry.
摘要:
Digital timing unit for timing data processing systems or units thereof, wherein the output signals of a shift register are applied to a plurality of EXCLUSIVE OR gates (G 1 ) .... (G n ). The shift register, at first in a known status, is activated so that an electrical transition is shifted through the register cells and defines a timing cycle, at the end of which the register is set in a second known status. A feedback and control logic (3, 4, 5, 6, 7, 8, 9) allows to activate the register independently from its status and to keep it in the status occuring at the end of a timing cycle until a new start signal is received. The shift of the register is caused by timing pulses generated by an oscillator (1). The timing signals generated by the timing unit and present on the outputs of the EXCLUSIVE OR may be modified, as to the length, by changing the oscillator period and/or the connection between the EXCLUSIVE OR inputs and the outputs of the shift register.