Abstract:
A digital phase locked loop (DPLL) circuit includes a digital-to-time converter (DTC) configured to generate a delayed reference clock signal by delaying a reference clock signal according to a delay control signal and a time-to-digital converter (TDC) coupled to an output of the DTC. The TDC is configured to sample a value of a transition signal according to the delayed reference clock signal and to generate an output signal indicating a phase difference between the delayed clock signal and an input clock signal. A method of controlling a DPLL includes delaying a reference clock signal according to a delay control signal, sampling a value of a transition signal according to the delayed reference clock signal, generating an output signal indicating a phase difference between the delayed clock signal and an input clock signal, and generating a digitally controlled oscillator (DCO) clock signal according to the output signal.
Abstract:
A non-linear pulse code modulator wherein input signals are coded into digital representations of amplitude range segments and amplitude in excess of the minimum amplitude within the respective range segment uses a first analog-to-digital converter having a sawtooth-shaped control characteristic to determine the amplitude range segment from an input signal sample. The output of the first analog-to-digital converter is used to effectively divide the signal sample by a factor 2.sup.n, where n corresponds to the determined range. The result of the division is then converted in a second analog-to-digital conversion to a digital signal that is combined with the digital range segment signal for transmission thereof.
Abstract:
The invention relates to a method for estimating bandwidth mismatch in a time-interleaved A/D converter (10) comprising - precharging to a first state second terminals of capacitors (3) in each channel (1) of a plurality of channels and sampling (2) a reference analog input voltage signal (V ref ) applied via a first switchable path (6) whereby the sampled input voltage signal is received at first terminals of said capacitors, - setting in each channel said second terminals to a second state, thereby generating a further reference voltage signal (V diff ) at said first terminals, - applying said reference analog input voltage signal to said first terminals via a second switchable path (7), said second path having a given impedance being higher than the known impedance of said first path, thereby creating on said first terminals a non-zero settling error indicative of an incomplete transition from said further reference voltage signal to said reference analog input voltage signal, - quantizing said settling error, thereby obtaining an estimate of the non-zero settling error in each channel, - comparing said estimates of said non-zero settling errors of said channels and deriving therefrom an estimation of the bandwidth mismatch.
Abstract:
A time register includes: a pair of inputs coupled to a pair of input clocks; a pair of tri-state inverters for producing a pair of level signals; and a pair of outputs coupled to the level signals for producing a pair of output clocks, wherein the tri-state inverters are responsive to a pair of state signals and the pair of input clocks for holding or discharging the level signals.
Abstract:
PROBLEM TO BE SOLVED: To obtain a highly accurate timestamp.SOLUTION: An electronic device of this embodiment includes: a threshold determination part; a plurality of comparator circuits; a time digital conversion circuit; a low pass filter part; an analog digital conversion circuit; and an energy calculation part. A threshold determination part dynamically determines a plurality of thresholds. Each comparator circuit compares the corresponding threshold with an analog input signal. The time digital conversion circuit outputs a plurality of time values by outputting the time values when the analog input signal matches to a threshold of the plurality of thresholds, or when the analog input signal exceeds the threshold. A low pass filter part is adjustable, and filters the analog input signal. The analog digital conversion circuit performs analog to digital conversion to the filtered analog input signal to generate a digital signal. An energy calculation part calculates energy of the digital signal in response to reception of a trigger signal.
Abstract:
Erfindungsgemäß wird ein Verfahren zur Entstörung eines Abtastprozesses zur Verfügung gestellt, wobei das Verfahren die Verfahrensschritte des Abtastens eines analogen Signals (16) mit einer Abtastfrequenz f (17) sowie des Bestimmens, ob eine Störamplitude (20) vorliegt, umfasst. Das Verfahren ist dadurch gekennzeichnet, dass bei Vorliegen einer Störamplitude (20) die Abtastfrequenz f (17) vergrößert oder verkleinert wird und das Verfahren erneut mit dem Verfahrensschritt des Abtastens des analogen Signals (16) mit der vergrößerten oder verkleinerten Abtastfrequenz beginnt. Ferner wird eine Vorrichtung zur Durchführung des Verfahrens zur Verfügung gestellt.